Document:

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                                  EXHIBIT 10.2

                       AMENDED, RESTATED AND CONSOLIDATED
                           LOAN AND SECURITY AGREEMENT
                           ---------------------------

         THIS AMENDED, RESTATED AND CONSOLIDATED LOAN AND SECURITY AGREEMENT
(this "Agreement") is made as of July 1, 2004 among Radnet Management, Inc., a
California corporation ("RMI"), Diagnostic Imaging Services, Inc., a Delaware
corporation ("DIS"), ("Debtors" and each a "Debtor") and DVI Financial Services
Inc. ("Secured Party").

                                 R E C I T A L S
                                 ---------------

         WHEREAS, each of the Debtors is obligated to Secured Party in the
amounts set forth on Schedule A hereto (as of the date hereof) as evidenced by
those loan agreements, loan and security agreements, master leases, schedules
and promissory notes set forth on Schedule A hereto (collectively, as any of the
foregoing may have been amended, modified, supplemented, extended or restated
from time to time, the "Prior Financing Documents");

         WHEREAS, each of the Debtors are affiliated with each other and have
benefited from the loans and advances made to all Debtors under the Prior
Financing Documents;

         WHEREAS, the Debtors are in default of their respective obligations to
Secured Party under the Prior Financing Documents; and

         WHEREAS, as part of a negotiated settlement among the Debtors and the
Secured Party, the Debtors and the Secured Party have agreed to amend, restate
and consolidate the Prior Financing Documents into this Agreement on the terms
and conditions set forth herein;

         NOW, THEREFORE, in consideration of the mutual conditions and
agreements set forth herein, and for other good and valuable consideration, the
receipt and sufficiency of which is hereby acknowledged, the parties hereto
agree as follows:

                                    CERTAIN DEFINITIONS. THE FOLLOWING TERMS
                                    SHALL HAVE THE FOLLOWING RESPECTIVE
                                    MEANINGS: COLLATERAL shall mean any assets
                                    of Debtors now or hereafter securing the
                                    Obligations.

EVENT OF DEFAULT shall mean those events set forth in Section 10 hereof.

HEALTH CARE LAWS mean all federal, state and local laws relating to health care
providers and health care services, including, without limitation, Section
1877(a) of the Social Security Act as amended by the Omnibus Budget
Reconciliation Act of 1993,42 U.S.C. ss. l395nn.

LOAN shall have the meaning assigned to it in Section 2(b) hereof.

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LOAN DOCUMENTS shall mean this Agreement, the Security Documents and all other
guarantees, reaffirmation of guarantees, security agreements, pledge agreements,
notes, instruments and other documents and agreements executed in connection
with this Agreement or the Prior Loan Documents and/or otherwise securing or
supporting the Obligations.

MATURITY DATE shall mean June 1, 2008; PROVIDED, that such date shall be
automatically extended to the date which is one month prior to the maturity date
set forth in either (i) any extension of the 11.5% Series A convertible
subordinated debentures due June 30, 2008 of Primedex Health Systems Inc., so
long as such extension does not require any payments of principal, increase the
interest rate charged, modify the subordination terms as they apply to this
Agreement, or otherwise vary the payment terms from the terms existing on the
date hereof or (ii) any refinancing of the subordinated debt described in clause
(i) above so long as the terms of such replacement subordinated debt do not
require principal payments until maturity and are otherwise no more adverse to
Primedex Health Systems Inc. or to Secured Party than the terms of the
subordinated debt described under clause (i) above in effect or the date hereof;
PROVIDED, that in no event shall the maturity Date under this Agreement extend
past October 31, 2010.

OBLIGATIONS shall mean all principal and interest in respect of the Loan, all
Secured Party Expenses and all additional amounts and other sums at any time due
and owing under this Agreement and any other Loan Documents and the performance
and observance of all covenants and conditions contained herein and therein.

SECURED PARTY EXPENSES means all (i) costs and expenses (including, without
limitation, taxes and insurance premiums) required to be paid by any Debtor
under this Agreement or under any of the other Loan Documents that are paid or
advanced by Secured Party or any affiliate of Secured Party, (ii) filing,
recording, publication and search fees paid or incurred by Secured Party in
connection with Secured Party's transactions with Debtors, (iii) costs and
expenses incurred by Secured Party to correct any Event of Default, enforce any
provision of the Loan Documents or in gaining possession of, maintaining,
handling, preserving, storing, shipping, selling or preparing for sale or
advertising to sell any Collateral, whether or not a sale is consummated, after
the occurrence and during the continuance of an Event of Default, (iv) costs and
expenses of suit incurred by Secured Party in enforcing or defending the Loan
Documents or any portion thereof, (v) costs and expenses incurred by Secured
Party to convert any data submitted to Secured Party by Debtor to a form
reasonably acceptable to Secured Party and (vi) Secured Party's reasonable
attorney fees and expenses incurred (before or after execution of this
Agreement) in advising Secured Party with respect to, or in structuring,
drafting, reviewing, negotiating, amending, terminating, enforcing, defending or
otherwise concerning, the Loan Documents or any portion thereof, irrespective of
whether suit is brought.

SECURITY DOCUMENTS means collectively, (i) that certain Master Security
Agreement dated as of May 1, 2002 between RMI and Secured Party, (ii) that
certain Master Security Agreement dated as of March 20, 2002 between DIS and
Secured Party, (iii) that certain Master Security Agreement dated as of July 11,
2001 between RMI and Secured Party, (iv) that certain Securities Pledge
Agreement dated as of December 20, 1999 between RMI and Secured Party and (v)
all other security agreements, pledge agreements, documents and agreements
granting Secured Party a lien in any assets of any Debtor, in each case as
amended, restated, supplemented or otherwise modified from time to time.

                                       2
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                                    DESCRIPTION OF LOANS.
                                    ---------------------
The Debtors acknowledge and agree that as of the date hereof, (i) there exists
an outstanding amount of principal and interest of not less than $17,800,000
owing to Secured Party under the Prior Financing Documents, (ii) the Debtors are
in default of their respective payment obligations under the Prior Financing
Documents and (iii) each Debtor has no right of offset, defense or counterclaim
with respect to any amounts owing under the Prior Financing Documents.

Upon satisfaction of the conditions set forth in Section 17 hereof, the parties
hereto agree that (i) all the Prior Financing Documents shall be amended,
restated and consolidated into this Agreement, (ii) the amount of indebtedness
owed to Secured Party by Debtors under the Prior Financing Documents and
outstanding as of the date hereof shall be evidenced by this Agreement and shall
be in the principal amount of $15,200,000 (the "Loan") after giving effect to
the payment required under Section 17(c) hereof. Interest shall accrue on the
outstanding amount of the loan at a rate per annum equal to nine percent (9%)
calculated or the basis of a 360 day year and accrual days elapsed.

The Debtors, jointly and severally, agree to repay the Loan and interest accrued
thereon as follows: (i) on July 29, 2004, interest only on the Loan shall be
paid for the month of July in the amount of $114,000; (ii) on the last business
day of each of August, 2004, September, 2004, October, 2004, November, 2004 and
December, 2004 interest only on the Loan shall be paid in arrears in the amount
of $114,000 for each such month, (iii) thereafter, commencing on January 31,
2005 and on the last business day of each month thereafter, equal monthly
installments of principal and interest shall be paid in the amount of
$273,988.16 for each such month and (iv) on June 1, 2008, the balance of the
principal and interest on the Loan equal to $7,555,263.18 (PROVIDED, that if the
Maturity Date is extended pursuant to the definition of "Maturity Date" herein,
the monthly installments under clause (iii) above shall continue to be paid on
the last business day of each month after May 30, 2008 until the extended
Maturity Date). Notwithstanding the foregoing, on the earlier of (A) the
Maturity Date or (B) such earlier date on which the Obligations are declared due
and payable pursuant to the terms of this Agreement, the entire outstanding
principal amount of the Loan, together with all accrued and unpaid interest
thereon, shall be due and payable. The Debtors may prepay the Loan at any time
and from time to time in increments of $100,000 without penalty or premium and
any such prepayments shall be applied to reduce the scheduled installments
ratably against all scheduled installments. No portion of the Loan may be
reborrowed once repaid. All payments of the Obligations and other amounts set
forth on Section 17 hereof shall be made in immediately available funds to
Secured Party per the wiring instructions set forth on Schedule D hereto or
pursuant to such other instructions as Secured Party shall provide to Debtors.

                                       3
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                                    INTEREST. AT SECURED PARTY'S OPTION,
                                    INTEREST WILL ACCRUE ON THE UNPAID PORTION
                                    OF PRINCIPAL OF THE LOAN HEREOF AND ALL
                                    OTHER SUMS DUE FROM DEBTOR HEREUNDER AND
                                    UNDER THE LOAN DOCUMENTS FOLLOWING THE
                                    OCCURRENCE AND DURING THE CONTINUANCE OF AN
                                    EVENT OF DEFAULT UNTIL THE DATE OF PAYMENT
                                    IN FULL OF SUCH PRINCIPAL AND ALL OTHER SUMS
                                    DUE HEREUNDER OR UNDER THE LOAN DOCUMENTS AT
                                    A FIXED RATE OF 18% PER ANNUM (THE "Default
                                    Rate"). INTEREST AT THE DEFAULT RATE WILL BE
                                    COLLECTIBLE AS PART OF ANY JUDGMENT
                                    HEREUNDER AND SECURED BY THE COLLATERAL.
                                    DEBTORS ACKNOWLEDGE AND AGREE THAT THE
                                    INCREASE IN THE INTEREST RATE AFTER THE
                                    OCCURRENCE AND DURING THE CONTINUANCE OF AN
                                    EVENT OF DEFAULT IS INTENDED TO COMPENSATE
                                    SECURED PARTY FOR THE ADDED RISKS OF
                                    MAINTAINING A DEFAULTED LOAN AND IS NOT
                                    INTENDED AS A PREMIUM, PENALTY, LIQUIDATED
                                    DAMAGES OR REIMBURSEMENT FOR INTERNAL OR
                                    OUT-OF-POCKET COSTS ASSOCIATED THEREWITH.
                                    ANY JUDGMENT OBTAINED HEREUNDER OR UNDER THE
                                    LOAN DOCUMENTS WILL ACCRUE INTEREST AT THE
                                    DEFAULT RATE UNTIL PAID.

                                    SECURITY INTEREST IN COLLATERAL.
                                    --------------------------------
The provisions under the Prior Financing Documents granting liens and security
interests in the assets of Debtors are hereby reaffirmed and shall be
incorporated into this Section 4 of this Agreement by reference and such liens
and security interests in the assets described in such Prior Financing Documents
shall continue to secure the Obligations hereunder. Each Debtor party to any of
the Security Documents hereby reaffirms all the security grants and obligations
of such Debtor under such Security Documents which Security Documents shall
continue to remain in effect until all Obligations are paid in full and this
Agreement is terminated. Each Debtor party to any of the Security Documents
agrees, acknowledges and confirms with Secured Party that the term "DVI
Indebtedness" as set forth in such Security Documents shall include all
Obligations under this Agreement and the term "Collateral" as defined in such
Security Documents shall secure the Obligations under this Agreement.

                                       4
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In addition to the foregoing, each Debtor hereby grants and assigns a security
interest to Secured Party and its successors and assigns in all the equipment
and other property of such Debtor described in Schedule B attached to this
Agreement, and all substitutions, renewals or replacements of and alterations,
additions or improvements, if any, to such Collateral together with in each and
every case all proceeds thereof. Each Debtor irrevocably authorizes Secured
Party(or its agent) to file at any time and from time to time such financing
statements under the uniform commercial code of any jurisdiction with respect to
the Collateral as Secured Party may require and any amendments or continuations
thereto, in each case naming a Debtor, as debtor, and Secured Party, as secured
party, under such financing statements, amendments and continuations.

Each item of Collateral shall secure all the Obligations and all other present
and future indebtedness or obligations of Debtors to Secured Party of every kind
and nature whatsoever. Each Debtor warrants and agrees that the Collateral will
be used primarily for business or commercial purposes and that regardless of the
manner of affixation the Collateral shall remain personal property and shall not
become part of the real estate. Each Debtor agrees to keep the Collateral at the
locations of such Debtor set forth on Schedule B and will not make any change in
the location of the Collateral without the prior written consent of Secured
Party.

                                    TIME IS OF THE ESSENCE; LATE CHARGES. TIME
                                    IS OF THE ESSENCE IN THIS AGREEMENT AND IF
                                    ANY SCHEDULED INSTALLMENT IS NOT PAID WITHIN
                                    THE TEN (10) DAYS AFTER THE DUE DATE
                                    THEREOF, SECURED PARTY SHALL HAVE THE RIGHT
                                    TO ADD AND COLLECT, AND DEBTORS, JOINTLY AND
                                    SEVERALLY, AGREE TO PAY, A LATE CHARGE ON
                                    AND IN ADDITION TO, SUCH SCHEDULED
                                    INSTALLMENT EQUAL TO FIVE PERCENT (5%) OF
                                    SUCH SCHEDULED INSTALLMENT OR A LESSER
                                    AMOUNT IF ESTABLISHED BY ANY STATE OR
                                    FEDERAL STATUTE APPLICABLE THERETO.

                                       5
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                                    NO WARRANTIES. THIS AGREEMENT IS SOLELY A
                                    FINANCING AGREEMENT. EACH DEBTOR
                                    ACKNOWLEDGES THAT: THE COLLATERAL HAS BEEN
                                    SELECTED AND ACQUIRED SOLELY BY SUCH DEBTOR
                                    FOR SUCH DEBTOR'S PURPOSES; SECURED PARTY IS
                                    NOT THE MANUFACTURER, DEALER, VENDOR OR
                                    SUPPLIER OF SAID COLLATERAL; THE COLLATERAL
                                    IS OF A SIZE, DESIGN CAPACITY, DESCRIPTION
                                    AND MANUFACTURE SELECTED BY THE DEBTOR;
                                    DEBTOR IS SATISFIED THAT THE COLLATERAL IS
                                    SUITABLE AND FIT FOR ITS PURPOSES; AND
                                    SECURED PARTY HAS NOT MADE AND DOES NOT MAKE
                                    ANY WARRANTY OR REPRESENTATION WHATSOEVER,
                                    EITHER EXPRESS OR IMPLIED AS TO THE FITNESS,
                                    CONDITION, MERCHANTABILITY, DESIGN OR
                                    OPERATION OF THE COLLATERAL, ITS FITNESS FOR
                                    ANY PARTICULAR PURPOSE, THE VALUE OF THE
                                    COLLATERAL, WORKMANSHIP IN THE COLLATERAL,
                                    NOR ANY OTHER REPRESENTATION OR WARRANTY
                                    WHATSOEVER. EACH DEBTOR ACKNOWLEDGES AND
                                    AGREES THAT NEITHER THE MANUFACTURER,
                                    VENDOR, A DEALER OR SUPPLIER, NOR ANY
                                    SALESMAN, REPRESENTATIVE, OR OTHER AGENT OF
                                    THE MANUFACTURER, DEALER, VENDOR OR
                                    SUPPLIER, IS AN AGENT OF SECURED PARTY. NO
                                    SALESMAN, REPRESENTATIVE OR AGENT OF THE
                                    MANUFACTURER, DEALER VENDOR OR SUPPLIER IS
                                    AUTHORIZED TO WAIVE OR ALTER ANY TERM OR
                                    CONDITION OF THIS AGREEMENT AND NO
                                    REPRESENTATION AS TO THE COLLATERAL OR ANY
                                    OTHER MATTER BY ANY MANUFACTURER DEALER,
                                    VENDOR OR SUPPLIER SHALL AFFECT ANY DEBTOR'S
                                    DUTY TO PAY THE LOAN AND PERFORM THE OTHER
                                    OBLIGATIONS AS SET FORTH IN THIS AGREEMENT.

                                       6
<PAGE>

                                    INSURANCE AND RISK OF LOSS. ALL RISK OF LOSS
                                    OF, DAMAGE TO, OR DESTRUCTION OR THE
                                    COLLATERAL SHALL AT ALL TIMES BE ON DEBTORS.
                                    EACH DEBTOR WILL PROCURE FORTHWITH AND
                                    MAINTAIN PROPERTY AND GENERAL LIABILITY
                                    INSURANCE WITH EXTENDED OR COMBINED
                                    ADDITIONAL COVERAGE ON THE COLLATERAL FOR
                                    THE FULL INSURABLE VALUE THEREOF FOR THE
                                    LIFE OF THIS AGREEMENT PLUS SUCH OTHER
                                    INSURANCE AS SECURED PARTY MAY SPECIFY AND
                                    PROMPTLY DELIVER EACH TO SECURED PARTY WITH
                                    A STANDARD LONG FORM ENDORSEMENT ATTACHED
                                    SHOWING LOSS PAYABLE TO SECURED PARTY OR
                                    ASSIGNS AS RESPECTIVE INTERESTS MAY APPEAR.
                                    SUCH POLICIES SHALL NAME EACH SUCH DEBTOR AS
                                    OWNER OF THE COLLATERAL AND SECURED PARTY AS
                                    INSURED OR LOSS PAYEE AS THE CASE MAY BE.
                                    EACH INSURER SHALL AGREE BY ENDORSEMENT UPON
                                    SUCH POLICY ISSUED BY IT OR BY INDEPENDENT
                                    INSTRUMENT FURNISHED TO SECURED PARTY AND
                                    EACH SUCH DEBTOR THAT IT WILL GIVE SECURED
                                    PARTY AND SUCH DEBTOR THIRTY (30) DAYS
                                    WRITTEN NOTICE BEFORE THE POLICY IN QUESTION
                                    SHALL BE MATERIALLY ALTERED OR CANCELLED.
                                    SECURED PARTY'S ACCEPTANCE OF POLICIES IN
                                    LESSER AMOUNTS OR RISKS SHALL NOT BE A
                                    WAIVER OF DEBTORS' FOREGOING OBLIGATION.

                                    DEBTORS' REPRESENTATIONS AND WARRANTIES.
                                    EACH DEBTOR REPRESENTS AND WARRANTS TO
                                    SECURED PARTY AS FOLLOWS:
Such Debtor is a corporation fully organized and existing under the laws of the
State of its incorporation without limit as to the duration of its existence and
is authorized and in good standing to do business in said State. Such Debtor has
corporate powers and adequate authority, rights and franchises to own its own
property and to carry on its business as now conducted, and is duly qualified
and in good standing in each state in which the character of the properties
owned by it therein or the conduct of its business makes such qualifications
necessary; and such Debtor has the corporate power and adequate authority to
make and carry out this Agreement.

The execution, delivery and performance of this Agreement are duly authorized
and do not, to the best of such Debtor's knowledge, require the consent or
approval of any governmental body or other regulatory authority; are not in the
contravention of or in conflict with any law, regulation or any term or
provision of its articles or certificate of incorporation, bylaws and this
Agreement is the valid, binding and legally enforceable obligation of such
Debtor in accordance with its terms.

                                       7
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The execution, delivery and performance of this Agreement will not contravene or
conflict with any agreement, indenture or undertaking to which such Debtor is a
party or by which it or any of its property may be bound by or affected, and
will not cause any lien, charge or other encumbrance to be created or imposed
upon any such property by-reason thereof.

After giving effect to the releases contemplated by Section 17(f) hereof, such
Debtor has good and valid title to its Collateral which is free from, and will
be kept free from, all liens, claims, security interests and encumbrances,
except for the security interest granted in favor of Secured Party.

No financing statement covering the Collateral listed on Schedule B hereto or
any proceeds thereof is on file in favor of anyone other than Secured Party,
unless the lien evidenced by such financing statement is subordinated to the
liens of Secured Party in a manner acceptable to Secured Party.

All necessary action, including the filing of UCC-1 Financing Statements, has
been taken in order to provide Secured Party with a perfected security interest
in the Collateral.

Such Debtor (i) has obtained all material permits, licenses and other
authorizations that are required under Health Care Laws applicable to such
Debtor, (ii) is in compliance in all material respects with all terms and
conditions of such required permits, licenses and authorizations and (c) is in
compliance in all material respects with all other limitations, restrictions,
conditions, standards, prohibitions, requirements, obligations, schedules and
timetables contained in such Health Care Laws.

                                    DEBTORS' AGREEMENTS. EACH DEBTOR AGREES:
To defend at such Debtor's own cost and expense any action, proceeding or claim
affecting the Collateral.

To promptly pay all Secured Party Expenses upon demand by Secured Party.

To pay promptly all taxes, assessments, license fees and other public or private
charges when levied or assessed against the Collateral or this Agreement and
this obligation shall survive the termination of this Agreement.

That if a certificate of title is required or permitted by law, such Debtor
shall obtain such certificate with respect to the Collateral, showing the
security interests of Secured Party thereon and in any event do everything
necessary or expedient to preserve or perfect the security interest of Secured
Party.

That such Debtor will not misuse, fail to keep in good repair, secrete, or
without the prior written consent of Secured Party and notwithstanding Secured
Party's claim to proceeds, sell, rent, lend, encumber or transfer any of the
Collateral.

That Secured Party may enter upon such Debtor's premises or wherever the
Collateral may be located at any reasonable time to inspect the Collateral and
such Debtor's books and records pertaining to the Collateral and such Debtor
shall assist Secured Party in making such inspection.

                                       8
<PAGE>

That the security interest granted by such Debtor to Secured Party shall
continue effective irrespective of the payment of the Obligations, so long as
there are any obligations of any kind, including obligations under guaranties or
assignments, owed by any Debtor to Secured Party.

Mark and identify the Collateral with all information and such manner as Secured
Party may request from time-to-time and replace promptly any such markings or
identification which are removed, de laced or destroyed.

Indemnify and hold Secured Party harmless from and against all claims, losses
liabilities (including negligence, tort and strict liability), damages,
judgments, suits and all legal proceedings and any and all costs and expense in
connection therewith (including attorney's fees) arising out of or in any manner
connected with the manufacture, purchase, financing, ownership, delivery,
rejection, nondelivery, possession use, transportation storage operation,
maintenance, repair, return or other disposition of the Collateral or with this
Agreement or any other Loan Documents including, without limitation, claims for
injury to, or death of, persons and for damage, to property, and give Secured
Party prompt notice of such claim or liability.

Such Debtor will not sell, assign, transfer, dispose of or otherwise part with
possession or control or suffer or allow to pass out of its possession or
control items of Collateral listed on Schedule B without the prior written
consent of Secured Party.

That such Debtor shall not ASSIGN OR IN ANY WAY DISPOSE OF ALL OR ANY PART OF
ITS RIGHTS OR OBLIGATIONS UNDER THIS AGREEMENT OR SELL, LEASE OR TRANSFER OR
PLEDGE OR HYPOTHECATE ANY PART OF THE COLLATERAL. EACH DEBTOR'S INTEREST IN THIS
AGREEMENT AND THE COLLATERAL IS NOT ASSIGNABLE AND WILL NOT BE ASSIGNED OR
TRANSFERRED BY OPERATION OF LAW. CONSENT TO ANY OF THE FOREGOING PROHIBITED ACTS
APPLIES ONLY IN THE GIVEN INSTANCE AND IS NOT CONSENT TO SUBSEQUENT LIKE ACT BY
A DEBTOR OR ANOTHER ENTITY.

To (i) comply in all material respects with, and will obtain all material
permits required by, all Health Care Laws applicable to it and (ii) promptly
furnish to Secured Party a copy of any communication from any governmental
authority concerning any material violation of any Health Care Laws.

That it will not agree or consent to any amendments or modifications to any
agreement between any Debtor or Primedex Health System, Inc. and U.S. Bank (as
trustee and its affiliate (U.S. Bank Portfolio Services), as servicer with
respect to securitization trusts established by Secured Party or affiliates of
Secured Party but excluding DVI Receivables Corp. III), General Electric Capital
Corporation or Wells Fargo Foothill (or any other financing which replaces such
financing containing terms (including, but not limited to, increasing interest
rates, accelerating the principal amortization or maturity, new or more
stringent defaults, additional collateral, and new remedies provisions) that
would be more onerous to any debtor or that would adversely impact or affect
Secured Party with respect to the terms of this Agreement.

That it will continue to satisfy all claims of third parties relating to any of
the Prior Financing Documents which are unfunded.

                                       9
<PAGE>

That it will not change its legal name, legal entity status or chief executive
office from that set forth on Schedule C hereto.

That it will not make any distribution or declare or pay any dividends (in cash
or other property, other than common stock) on, or purchase, acquire, redeem, or
retire any of the Debtor's stock, of any class, whether now or hereafter
outstanding (collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as
no Event of Default shall have occurred and be continuing immediately prior to
or after giving effect to any such payment, (a) the Debtors may make
Distributions to Primedex Health Systems, Inc., a New York corporation (the
"PARENT") (1) in amounts necessary to pay customary expenses of Parent in the
ordinary course of its business as a public holding company (including salaries
and related reasonable and customary expenses incurred by employees of Parent)
in an aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993 and (b)
Parent may make Distributions in the form of common stock.

Commencing April 30, 2005, that the Debtors shall not permit the Fixed Charge
Coverage Ratio, (a) to be less than 1.0:1.0 as of the end of each April, July,
October and January (each, a "FISCAL QUARTER") ending prior to January 1, 2007,
and (b) to be less than 1.05:1 as of the last day of each Fiscal Quarter ending
thereafter. "FIXED CHARGE COVERAGE RATIO" means for any period, the ratio of (i)
EBITDA for such period MINUS cash capital expenditures made (to the extent not
already incurred in a prior period) or incurred during such period, to (ii) the
sum of (a) interest expense, (b) principal payments required to be paid during
such period in respect of indebtedness, and (c) all federal, state, and local
income taxes accrued, all as determined for the twelve months ending on the
determination date for RMI and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, RMI and
its subsidiaries' consolidated net earnings (or loss), minus extraordinary gains
and interest income, plus interest expense, income taxes, and depreciation and
amortization for such period, all as determined for the twelve months ending on
the determination date for RMI and its subsidiaries on a consolidated basis
without duplication and in accordance with generally accepted accounting
principles consistently applied.

That it shall not permit the Leverage Ratio, as determined as of the end of each
Fiscal Quarter, to be greater than the amount set forth in the following table
for the Fiscal Quarters ending in the period set forth opposite thereto:

                    LEVERAGE RATIO                 PERIOD
                    --------------                 ------

                       4.50:1.0               04/30/05 - 10/30/05
                       4.30:1.0               10/31/05 - 10/30/06
                       4.00:1.0               10/31/06 - 10/30/07
                       3.85:1.0               10/31/07 - 10/30/08

                                       10
<PAGE>

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations owing to Secured Party, General Electric
Capital Corporation (and its affiliates) and U.S. Bank (and its affiliates); all
as determined for RMI and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

That it shall not permit the EBITDA Margin to be less than 25% as of the end of
any Fiscal Quarter ending on or after April 30, 2005. "EBITDA MARGIN" means for
any period, the ratio of (a) EBITDA for such period, to (b) net revenues
(excluding the professional service fee component of radiology services) for
such period, all as determined for the twelve months ending on the determination
date for RMI and its subsidiaries on a consolidated basis without duplication
and in accordance with generally accepted accounting principles consistently
applied.

That it shall not permit the Receivable Days to exceed 65 days as of the end of
any Fiscal Quarter ending on or after April 30, 2005. "RECEIVABLE DAYS" means
for any period, a number equal to (a) 365 divided by (b) the result of (i) net
revenues for such period divided by (ii) net receivables for such period, all as
determined for the twelve months ending on the determination date for RMI and
its subsidiaries on a consolidated basis without duplication and in accordance
with generally accepted accounting principles consistently applied.

                                    EVENTS OF DEFAULT. ANY OF THE FOLLOWING
                                    EVENTS OR CONDITIONS SHALL CONSTITUTE AN
                                    EVENT OF DEFAULT HEREUNDER:
Default in payment of any installment of the principal or interest when and
after the same shall become due and payable, whether at the due date thereof, or
at the date fixed or prepayment or by acceleration or otherwise;

Default in the due observance or performance by any Debtor of any covenant or
agreement to be observed or performed by such Debtor under this Agreement or of
any other Loan Document delivered by such Debtor to Secured Party in connection
with this or any other transaction;

Any representation or warranty made by any Debtor herein or in any report,
certificate financial or other statement furnished in connection with this
Agreement shall prove to be false or misleading in any material respect; or

                                       11
<PAGE>

Any Debtor shall (i) be adjudicated insolvent or a bankrupt, or cease, be unable
or admit in writing its inability to pay its debts as they mature or make a
general assignment for the benefit of, or enter into any composition or
arrangement with, creditors; (ii) apply for or consent to the appointment of a
receiver, trustee or liquidator of it or of a substantial part of its property,
or authorize such application or consent, or proceedings seeking such
appointment shall be instituted against it without such authorization, consent
or application and shall continue undismissed for a period of 60 calendar days;
(iii) authorize or file a voluntary petition in bankruptcy or apply for or
consent to the application of any bankruptcy, reorganization in bankruptcy,
arrangement, readjustments of debts, insolvency, dissolution, moratorium or
other similar law of any jurisdiction, or authorize such application or consent,
or proceedings to such end shall be instituted against it without such
authorization application or consent and such proceeding instituted against it
shall continue undismissed for a period of 60 calendar days;

Whenever Secured Party, in good faith, believes the prospect of payment or
performance is impaired or in good faith believes the Collateral is insecure;

Any agreement made by a guarantor, surety or endorser for any Debtor's default
in any obligation or liability to Secured Party or any guaranty obtained in
connection with this transaction is terminated or breached;

If a judgment for the payment of money on any claim is rendered against any
Debtor in excess of $100,000; or

If any Debtor is in default of the terms and conditions of any indebtedness or
lease in excess of $100,000.

                                    SECURED PARTY'S REMEDIES. EACH DEBTOR AGREES
                                    THAT WHEN AN EVENT OF DEFAULT HAS OCCURRED
                                    AND IS CONTINUING, SECURED PARTY SHALL HAVE
                                    THE RIGHTS, OPTIONS, DUTIES AND REMEDIES OF
                                    A SECURED PARTY AND DEBTOR SHALL HAVE THE
                                    RIGHTS AND DUTIES OF A DEBTOR UNDER THE
                                    UNIFORM COMMERCIAL CODE IN EFFECT IN EACH
                                    JURISDICTION WHERE THE COLLATERAL OR ANY
                                    PART THEREOF IS LOCATED AND, WITHOUT
                                    LIMITING THE FOREGOING, SECURED PARTY MAY
                                    EXERCISE ONE OR MORE OR ALL, AND IN ANY
                                    ORDER, OF THE REMEDIES HEREINAFTER SET
                                    FORTH:

Secured Party may declare the entire unpaid principal balance of the Loan to be
immediately due and payable; and thereupon all such unpaid balances, together
with all accrued an a unpaid interest thereon and all other Obligations, shall
be immediately due and payable;

                                       12
<PAGE>

Secured Party personally, or by agents or attorneys, shall have the right
(subject to compliance with any applicable mandatory legal requirements) to take
immediate possession of the Collateral or any portion thereof and for that
purpose may pursue the same wherever it may be found and may enter any of the
premises of any Debtor with or without notice, demand, process of law or legal
procedure, and search for, take possession of, remove, keep and store the same,
or use, operate, or lease the same until sold and may otherwise exercise any and
all of the rights and powers of any Debtor in respect thereof;

Secured Party, may if at the time such action may be lawful (and always subject
to compliance with any mandatory legal requirements), either with or without
taking possession, either before or after taking possession, and without
instituting any legal proceedings whatsoever having first given notice of such
sale by mail to the applicable Debtor once at least 10 calendar days prior to
the date of such sales and any other notice of such sale which may be required
by law if said notice is sufficient, sell and dispose of the Collateral or any
part thereof at public auction(s) to the highest bidder, or at a private sale(s)
in one lot as an entirety or in several lots, and either for cash or for credit
and on such terms as Secured Party may determine and at any place (whether or
not it is the location of the Collateral or any part thereof) designated in the
notice above referred to. Any such sale or sales may be adjourned from time to
time by announcement of the time and place appointed for such sale or sales, or
for such adjourned sales or sales without further notice, and Secured Party may
bid and become the purchaser at any such sale;

Secured Party may proceed to, protect, and enforce this Agreement and any other
Loan Documents by suit or suits or proceedings in equity, at law or in
bankruptcy, and whether for the specific performance of any covenant or
agreement herein contained or execution or aid of any power herein granted, or
for foreclosure hereunder, or for the appointment of a receiver or receivers for
the Collateral, or any party thereof, or for the enforcement of any proper,
legal or equitable remedy available under applicable law.

Secured Party may require any Debtor to assemble the Collateral and return it to
Secured Party at a place to be designated by Secured Party which is reasonably
convenient to both parties.

Debtors, jointly and severally, agree to pay the Secured Party all expenses of
retaking, holding, preparing for sale and/or selling the Collateral in addition
to attorneys' fees as above set forth.

Without limiting the rights of Secured Party under applicable law, Secured Party
has and may exercise a right of set-off, a lien against and a security interest
in all property of any Debtor now or at any time in Secured Party's or any
affiliate of Secured Party's possession in any capacity whatsoever, as security
for all of the Obligations. At any time and from time to time following the
occurrence of an Event of Default, Secured Party may without notice or demand,
set off and apply any and all deposits (general or special, time or demand,
provisional or final) at any time held and other indebtedness at any time owing
by Secured Party or any affiliate of Secured Party or for the credit of any
Debtor against any or all of the Obligations.

                                       13
<PAGE>

                                    ACCELERATION CLAUSE. IN CASE OF ANY SALE OF
                                    THE COLLATERAL, OR ANY PART THEREOF,
                                    PURSUANT TO ANY JUDGMENT OR DECREE OF ANY
                                    COURT OR OTHERWISE IN CONNECTION WITH THE
                                    ENFORCEMENT OF ANY OF THE TERMS OF THIS
                                    AGREEMENT, THE OUTSTANDING PRINCIPAL DUE,
                                    THE INTEREST ACCRUED THEREON AND ALL OTHER
                                    SUMS REQUIRED TO BE PAID BY DEBTORS PURSUANT
                                    TO THIS AGREEMENT SHALL AT ONCE BECOME AND
                                    BE IMMEDIATELY DUE AND PAYABLE.

                                    EXERCISE OF RIGHTS. NO DELAY OR OMISSION OF
                                    SECURED PARTY IN THE EXERCISE OF ANY RIGHT
                                    OR POWER ARISING FROM ANY DEFAULT SHALL
                                    EXHAUST OR IMPAIR ANY SUCH RIGHT OR POWER OR
                                    PREVENT ITS EXERCISE DURING THE CONTINUANCE
                                    OF SUCH DEFAULT. NO WAIVER BY SECURED PARTY
                                    OF ANY SUCH DEFAULT, WHETHER SUCH WAIVER BE
                                    FULL OR PARTIAL, SHALL EXTEND TO OR BE TAKEN
                                    TO AFFECT ANY SUBSEQUENT DEFAULT OR TO
                                    IMPAIR THE RIGHTS RESULTING THEREFROM EXCEPT
                                    AS MAY BE OTHERWISE PROVIDED THEREIN. THE
                                    GIVING, TAKING OR ENFORCEMENT OF ANY OTHER
                                    OR ADDITIONAL SECURITY COLLATERAL, OR
                                    GUARANTEE FOR THE PAYMENT OF THE OBLIGATIONS
                                    SHALL NOT OPERATE TO PREJUDICE WAIVE, OR
                                    AFFECT THE SECURITY OF THIS AGREEMENT OR ANY
                                    RIGHTS, POWERS, OR REMEDIES HEREUNDER, AND
                                    SECURED PARTY SHALL NOT BE REQUIRED TO LOOK
                                    FIRST TO ENFORCE OR EXHAUST SUCH OTHER
                                    ADDITIONAL SECURITY, COLLATERAL OR
                                    GUARANTEES. ALL RIGHTS, REMEDIES, AND
                                    OPTIONS OF SECURED PARTY HEREUNDER, OR BY
                                    LAW SHALL BE CUMULATIVE.

                                       14
<PAGE>

                                    ASSIGNMENT BY SECURED PARTY. SECURED PARTY
                                    MAY ASSIGN OR TRANSFER THIS AGREEMENT, ANY
                                    AND ALL OTHER LOAN DOCUMENTS, AND/OR SECURED
                                    PARTY'S INTEREST IN ANY OF THE COLLATERAL
                                    WITHOUT NOTICE TO ANY DEBTOR. ANY ASSIGNEE
                                    OF SECURED PARTY SHALL HAVE ALL OF THE
                                    RIGHTS BUT NONE OF THE OBLIGATIONS OF
                                    SECURED PARTY UNDER THIS AGREEMENT, AND EACH
                                    DEBTOR AGREES THAT IT WILL NOT ASSERT
                                    AGAINST ANY ASSIGNEE OF SECURED PARTY ANY
                                    DEFENSE, COUNTERCLAIM OR OFFSET THAT ANY
                                    DEBTOR MAY HAVE AGAINST SECURED PARTY.

                                    NON-TERMINABLE AGREEMENT; OBLIGATIONS
                                    UNCONDITIONAL. THIS AGREEMENT CANNOT BE
                                    CANCELLED OR TERMINATED EXCEPT AS EXPRESSLY
                                    PROVIDED HEREIN. THIS AGREEMENT AND THE
                                    OBLIGATIONS OF DEBTORS HEREUNDER SHALL
                                    TERMINATE UPON PAYMENT IN FULL OF ALL THE
                                    OBLIGATIONS; PROVIDE THAT TO THE EXTENT
                                    SECURED PARTY IS REQUIRED TO RETURN ANY OF
                                    THE OBLIGATIONS TO A DEBTOR OR OTHER PERSON
                                    AS RESULT OF BANKRUPTCY PROCEEDING,
                                    APPLICATION OF FRAUDULENT CONVEYANCE LAWS OR
                                    OTHERWISE, THEN THIS AGREEMENT AND ALL LIENS
                                    GRANTED BY DEBTORS DESCRIBED HEREIN SHALL BE
                                    REINSTATED. EACH DEBTOR HEREBY AGREES THAT
                                    ITS OBLIGATION TO PAY ALL OBLIGATIONS SHALL
                                    BE ABSOLUTE AND UNCONDITIONAL AND SUCH
                                    DEBTOR WILL NOT BE ENTITLED TO ANY ABATEMENT
                                    OF PAYMENTS DUE UNDER THIS AGREEMENT OR ANY
                                    REDUCTION THEREOF UNDER CIRCUMSTANCES OR FOR
                                    ANY REASON WHATSOEVER. EACH DEBTOR HEREBY
                                    WAIVES ANY AND ALL EXISTING AND FUTURE
                                    CLAIMS, AS OFFSETS, AGAINST ANY PAYMENTS DUE
                                    UNDER THIS AGREEMENT AS AND WHEN DUE
                                    REGARDLESS OF ANY OFFSET OR CLAIM WHICH MAY
                                    BE ASSERTED BY SUCH DEBTOR OR ON ITS BEHALF.
                                    THE OBLIGATIONS AND LIABILITIES OF DEBTORS
                                    HEREUNDER WILL SURVIVE THE TERMINATION OF
                                    THIS AGREEMENT.

                                       15
<PAGE>

                                    ADDITIONAL DOCUMENTS. IN CONNECTION WITH AND
                                    IN ORDER FOR EFFECTIVE EVIDENCE OF THE
                                    SECURITY INTEREST IN THE COLLATERAL GRANTED
                                    SECURED PARTY UNDER THIS AGREEMENT, EACH
                                    DEBTOR WILL EXECUTE AND DELIVER TO SECURED
                                    PARTY SUCH FINANCING STATEMENTS AND SIMILAR
                                    DOCUMENTS AS SECURED PARTY REQUESTS. EACH
                                    DEBTOR AUTHORIZES SECURED PARTY WHERE
                                    PERMITTED BY LAW TO MAKE FILINGS OF SUCH
                                    FINANCING STATEMENTS WITHOUT DEBTOR'S
                                    SIGNATURE. EACH DEBTOR FURTHER AGREES TO
                                    FURNISH SECURED PARTY:
(i) Within thirty (30) days after the end of fiscal quarter of Debtors and
within ninety (90) days after the end of each fiscal year of Debtors, Debtors'
consolidated, consolidating and on a center by center basis, financial
statements, including Debtors' balance sheet (not on a center by center basis),
income and cash flow statements, prepared in accordance with generally accepted
accounting principles (and audited in the case of fiscal year end financial
statements), which reports, Debtors' represent and warrant shall fully and
fairly represent the true financial condition of such Debtors and (ii) updated
projections for Debtors and for each center;

Any other financial information normally provided by such Debtor (or its parent
holding company) to the public; and

Such other financial data or information relative to this Agreement and the
Collateral, including, without limitation, listings of serial numbers or other
identification data and confirmations of such information, as Secured Party may
time-to-time reasonably request. Each Debtor will procure and/or execute, have
executed, have acknowledged, and or deliver to Secured Party, record and file
such other documents and notices as Secured Party deems necessary or desirable
to protect its interest in and rights under this Agreement and Collateral.
Debtors will, jointly and severally, pay for all filings, searches, title
reports, legal and other fees incurred by Secured Party in connection with any
documents to be provided by Debtors pursuant to this Agreement and any other
similar documents Secured Party may procure.

                                    CONDITIONS PRECEDENT. THIS AGREEMENT SHALL
                                    BECOME EFFECTIVE ON THE DATE HEREOF SO LONG
                                    AS EACH OF THE FOLLOWING CONDITIONS
                                    PRECEDENT HAS BEEN SATISFIED IN FORM,
                                    SUBSTANCE AND MANNER SATISFACTORY TO SECURED
                                    PARTY:
Secured Party shall have received executed counterparts to this Agreement from
each Debtor;

Secured Party shall have received guaranty reaffirmations from Primedex Health
Systems, Inc., Howard Berger and Fran Berger (limited to $250,000 in the
aggregate for both Howard Berger and Fran Berger);

                                       16
<PAGE>

Secured Party shall have received a payment of $2,600,000 to be applied to
principal and interest under the Prior Financing Agreements that is currently
due and owing;

Secured Party shall have received from Debtors reimbursement for all Secured
Party Expenses incurred in connection with this Agreement;

Secured Party shall have received an acknowledgement from Primedex Health
Systems, Inc. that the obligations under its Guaranty in favor of Secured Party
constitutes "Senior Debt" under the documents evidencing its subordinated debt;

Secured Party shall have received evidence that all liens (except for liens in
favor of Secured Party) on the Collateral set forth or Schedule B hereto have
been released (or subordinated to Secured Party's liens) in a manner
satisfactory to Secured Party in Secured Party's sole discretion, and in
furtherance thereof, Secured Party shall have received satisfactory
intercreditor agreements from U.S. Bank (or its affiliate), General Electric
Capital Corporation (or its affiliates); DVI Receivables Corp. III and Wells
Fargo Foothill;

RMI shall have satisfied all claims of third parties relating to any of the
Prior Financing Documents which are unfunded;

Secured Party shall have received releases from Cannon and Vital Imaging, two
third party vendors who made claims on account of Secured Party's (or any of its
affiliate's) failure to fund equipment purchases under the Prior Financing
Documents;

Secured Party shall have received evidence that (i) the Debtors financing
arrangements with General Electric Capital Corporation and U.S. Bank will
simultaneously close on the date hereof and (ii) the Debtors financing
arrangements with Wells Fargo Foothill will close by July 29, 2004;

Secured Party shall have received good standing certificates from the State of
California with respect to each Debtor; and

Secured Party shall have received a favorable opinion of Debtors' counsel, in
form and substance satisfactory to Secured Party.

                                       17
<PAGE>

                                    RELEASE. IN CONSIDERATION OF THE TERMS AND
                                    CONDITIONS PROVIDED BY SECURED PARTY
                                    HEREUNDER, EACH DEBTOR, ON BEHALF OF ITSELF
                                    AND ITS STOCKHOLDERS AND OTHER AFFILIATES
                                    AND THEIR SUCCESSORS AND ASSIGNS
                                    (COLLECTIVELY, "RELEASORS"), HEREBY FOREVER
                                    WAIVE, RELEASE AND DISCHARGE TO THE FULLEST
                                    EXTENT PERMITTED BY LAW ANY AND ALL CLAIMS
                                    (INCLUDING, WITHOUT LIMITATION, CROSSCLAIMS,
                                    COUNTERCLAIMS, RIGHTS OF SET-OFF AND
                                    RECOUPMENT), CAUSES OF ACTION, DEMANDS,
                                    SUITS, COSTS, EXPENSES AND DAMAGES
                                    (COLLECTIVELY, THE "CLAIMS"), THAT ANY
                                    RELEASOR NOW HAS OR HEREAFTER MAY HAVE, OF
                                    WHATSOEVER NATURE AND KIND, WHETHER KNOWN OR
                                    UNKNOWN, WHETHER NOW EXISTING OR HEREAFTER
                                    ARISING, WHETHER ARISING AT LAW OR IN
                                    EQUITY, AGAINST SECURED PARTY, OBSIDIAN
                                    FINANCE GROUP, LLC, AP SERVICES, LLC,
                                    GOLDMAN SACHS, CREDIT PARTNERS, L.P., ABLECO
                                    FINANCE, LLC, A3 FUNDING L.P AND THEIR
                                    RESPECTIVE AFFILIATES, SHAREHOLDERS AND
                                    "CONTROLLING PERSONS" (WITHIN THE MEANING OF
                                    THE FEDERAL SECURITIES LAWS), AND THEIR
                                    RESPECTIVE SUCCESSORS AND ASSIGNS AND EACH
                                    AND ALL OF THE OFFICERS, DIRECTORS,
                                    EMPLOYEES, AGENTS, ATTORNEYS AND OTHER
                                    REPRESENTATIVES OF EACH OF THE FOREGOING
                                    (COLLECTIVELY, THE "RELEASEES"), BASED IN
                                    WHOLE OR IN PART ON FACTS, WHETHER OR NOT
                                    NOW KNOWN, EXISTING ON OR BEFORE THE
                                    EXECUTION OF THIS AGREEMENT. THE RELEASE OF
                                    CLAIMS SET FORTH IN THIS SECTION 18 SHALL
                                    APPLY TO ALL CLAIMS ARISING UNDER THE PRIOR
                                    FINANCING AGREEMENTS, INCLUDING, WITHOUT
                                    LIMITATION, ANY OBLIGATIONS OF SECURED PARTY
                                    TO FUND ADDITIONAL LOANS UNDER THE PRIOR
                                    FINANCING AGREEMENTS.

                                       18
<PAGE>

                                    JOINT AND SEVERAL LIABILITY.
Each of the Debtors shall be jointly and severally liable hereunder and under
each of the other Loan Documents with respect to all Obligations, regardless of
which of the Debtors actually received the proceeds of the Loan or the benefit
of any other extensions of credit from Secured Party, or the manner in which the
Debtors or the Secured Party account therefor in their respective books and
records. Neither the joint and several liability of, nor the liens granted to
the Secured Party under the Loan Documents by, any of the Debtors shall be
impaired or released by (i) the failure of the Secured Party or any successors
or assigns thereof, or any holder of any of the Obligations to assert any claim
or demand or to exercise or enforce any right, power or remedy against any
Debtor, any guarantor, the Collateral or otherwise; (ii) any extension or
renewal for any period (whether or not longer than the original period) or
exchange of any of the Obligations or the release or compromise of any
obligation of any nature of any Debtor with respect thereto; (iii) the
surrender, release or exchange of all or any part of any property (including
without limitation the Collateral) securing payment, performance and/or
observance of any of the Obligations or the compromise or extension or renewal
for any period (whether or not longer than the original period) of any
obligations of any nature of any Debtor with respect to any such property; (iv)
any action or inaction on the part of the Secured Party, or any other event or
condition with respect to any other Debtor, including any such action or
inaction or other event or condition, which might otherwise constitute a defense
available to, or a discharge of, such Debtor or of the Obligations; and (v) any
other act, matter or thing (other than payment or performance of the
Obligations) which would or might, in the absence of this provision, operate to
release, discharge or otherwise prejudicially affect the obligations of such
Debtor or any other Debtor.

To the extent that any Debtor shall make a payment under this SECTION 19 of all
or any of the Obligations (other than that portion of the Loan made to that
Debtor for which it is primarily liable) (a "GUARANTOR PAYMENT") that, taking
into account all other Guarantor Payments then previously or concurrently made
by any other Debtor, exceeds the amount that such Debtor would otherwise have
paid if each Debtor had paid the aggregate Obligations satisfied by such
Guarantor Payment in the same proportion that such Debtor's "Allocable Amount"
(as defined below) (as determined immediately prior to such Guarantor Payment)
bore to the aggregate Allocable Amounts of each of the Debtor as determined
immediately prior to the making of such Guarantor Payment, then, following
indefeasible payment in full in cash of the Obligations and termination of this
Agreement, such Debtor shall be entitled to receive contribution and
indemnification payments from, and be reimbursed by, each other Debtor for the
amount of such excess, pro rata based upon their respective Allocable Amounts in
effect immediately prior to such Guarantor Payment.

As of any date of determination, the "ALLOCABLE AMOUNT" of any Debtor shall be
equal to the maximum amount of the claim that could then be recovered from such
Debtor under this SECTION 19 without rendering such claim voidable or avoidable
under Section 548 of Chapter 11 of the Bankruptcy Code or under any applicable
state Uniform Fraudulent Transfer Act, Uniform Fraudulent Conveyance Act or
similar statute or common law.

This SECTION 19 is intended only to define the relative rights of Debtors and
nothing set forth in this SECTION 19 is intended to or shall impair the
obligations of Debtors, jointly and severally, to pay any amounts as and when
the same shall become due and payable in accordance with the terms of this
Agreement.

                                       19
<PAGE>

The parties hereto acknowledge that the rights of contribution and
indemnification hereunder shall constitute assets of the Debtors to which such
contribution and indemnification is owing.

The rights of the indemnifying Debtors against other Debtors under this SECTION
19 shall be exercisable upon the full and indefeasible payment of the
Obligations and the termination of this Agreement.

                                    AMENDMENT AND RESTATEMENT. THIS AGREEMENT
                                    AMENDS AND RESTATES THE PROVISIONS OF THE
                                    PRIOR FINANCING AGREEMENTS AND, AS OF THE
                                    DATE HEREOF, EXCEPT AS EXPRESSLY MODIFIED
                                    HEREIN, ALL OF THE TERMS AND PROVISIONS OF
                                    THE PRIOR FINANCING AGREEMENTS SHALL
                                    CONTINUE TO APPLY FOR THE PERIOD PRIOR TO
                                    THE DATE HEREOF, INCLUDING ANY
                                    DETERMINATIONS OF PAYMENT DATES, INTEREST
                                    RATES, EVENTS OF DEFAULT OR ANY AMOUNT THAT
                                    MAY BE PAYABLE. THE OBLIGATIONS AND
                                    LIABILITIES OF DEBTORS TO SECURED PARTY
                                    UNDER THE PRIOR FINANCING AGREEMENTS SHALL
                                    FROM AND AFTER THE DATE HEREOF BE DEEMED TO
                                    CONTINUE UNDER THIS AGREEMENT AS THE
                                    OBLIGATIONS OF DEBTORS TO SECURED PARTY AND
                                    SHALL CONTINUE TO BE SECURED BY THE
                                    COLLATERAL IN ALL CASES SUBJECT TO THE TERMS
                                    AND CONDITIONS OF THIS AGREEMENT. THE
                                    SECURITY INTERESTS AND LIENS IN THE
                                    COLLATERAL SECURING THE OBLIGATIONS AND
                                    LIABILITIES OF THE DEBTORS UNDER THE PRIOR
                                    FINANCING AGREEMENTS SHALL CONTINUE AS
                                    SECURITY INTERESTS AND LIENS IN THE
                                    COLLATERAL SECURING THE OBLIGATIONS
                                    HEREUNDER.

                                    MISCELLANEOUS.
                                    --------------
SUCCESSORS AND ASSIGNS. Whenever any of the parties hereto is referred to, such
reference shall be deemed to include the successors and assigns of such parties,
and all the covenants, promises and agreements in this Agreement contained by or
on behalf of Debtors or Secured Party shall bind and inure to the benefit of the
respective successors and assigns of each party whether so expressed or not.

PARTIAL INVALIDITY. The enforceability or invalidity of any provision(s) of this
Agreement shall not render any other provision(s) herein contained unenforceable
or invalid.

                                       20
<PAGE>

NOTICES. All notices, requests and other communications made or given in
connection with this Agreement or any of the other Loan Documents will be in
writing and will be deemed to be received (i) upon personal delivery to the
individual or division or department to whose attention notices to a party are
to be addressed by private carrier, (ii) three (3) business days after being
sent by registered or certified mail, return receipt requested or (iii) upon
confirmed receipt by telecopy or e-mail with the original forwarded by
first-class mail, in all cases, with charges prepaid, addressed to any Debtor,
at the address set forth below, and to Secured Party, at the addresses set forth
below:

         To Debtors:                c/o Beverly Radiology Medical Group III
                                    1510 Cotner Avenue
                                    Los Angeles, California  90025
                                    Attn:  Dr. Howard G. Berger
                                    Facsimile: (310) 445-2980

         To Secured Party:          DVI Financial Services Inc.
                                    2500 York Road
                                    Jamison, PA 18929
                                    Attention: Chief Executive Officer
                                    Telephone: (215)488-5000
                                    Facsimile: (215) 488-5010
                                    E-Mail: DVI@dvi-inc.com

         With Copy to:              Latham & Watkins
                                    5800 Sears Tower
                                    Chicago, IL  60606
                                    Attention: Vik Puri
                                    Facsimile: (312) 993-9767
                                    E-Mail:  vik.puri@lw.com

COUNTERPART; GOVERNING LAW. This Agreement may be executed, acknowledged, and
delivered in any number of counterparts, each of such counterparts constituting
an original but all together only one Agreement. This Agreement and any other
Loan Document (unless expressly set forth therein) shall be construed and
enforced in accordance with and governed by the laws of the Commonwealth of
Pennsylvania without resort to principles of conflicts of laws. Each Debtor
agrees to submit to the jurisdiction of the State and/or Federal Courts in the
Commonwealth of Pennsylvania.

ENTIRE AGREEMENT. This Agreement constitutes the entire understanding or
agreement between Secured Party and Debtors and there is no understanding or
agreement, oral or written, which is not set forth herein. This Agreement may
not be amended except by a writing signed by Secured Party and Debtors and shall
be binding upon and inure to the benefit of the parties hereto, their permitted
successors and assigns.

                            [SIGNATURE PAGES FOLLOW]

                                       21
<PAGE>

         IN WITNESS WHEREOF, Secured Party and Debtors have caused this
Agreement to be duly executed as of the day and year first above written.

                                      SECURED PARTY:
                                      -------------

                                      DVI FINANCIAL SERVICES INC.

                                      By:
                                         ---------------------------------------
                                      Name:
                                           -------------------------------------
                                      Title:
                                            ------------------------------------

                                      DEBTORS:

                                      RADNET MANAGEMENT, INC.

                                      By:
                                         ---------------------------------------
                                      Name:
                                           -------------------------------------
                                      Title:
                                            ------------------------------------

                                      DIAGNOSTIC IMAGING SERVICES, INC.

                                      By:
                                         ---------------------------------------
                                      Name:
                                           -------------------------------------
                                      Title:
                                            ------------------------------------

                                       22<PAGE>

                                  EXHIBIT 10.3

                                                                       #2785-002

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVI, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management I, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025 ("RADNET
I"), and such other signatories hereto.

                  WHEREAS, on or about August 31, 2000, Radnet I executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #2785-002 dated August 31,
2000 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet I to DVI (collectively the "OBLIGATIONS"), Radnet I,
pursuant to a Master Security Agreement dated on or about August 31, 2000 (the
"SECURITY AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet I to DVI, Radnet I delivered to DVI the guarantees (the
"GUARANTEES") of Primedex Health Systems, Inc. and Radnet Management, Inc. (each
a "GUARANTOR", and collectively the "GUARANTORS") (the Guarantees together with
the Loan and ancillary documents are, collectively, the "LOAN DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVI, L.L.C. ("DVI XVI")
and thereafter pursuant to an Amended and Restated Indenture, DVI XVI granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #2785-002

noteholder which purchased asset backed promissory notes issued by DVI XVI (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet I or certain
affiliates of Radnet I to this and other DVI securitizations (collectively the
"RELATED LOANS"); WHEREAS, Radnet I is in default under the terms of the Loan;

                  WHEREAS, Radnet I has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet I and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet I and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet I acknowledges that it is duly indebted to the
Trustee in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and
has no defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #2785-002

"AMENDED AND RESTATED RIDER A"). Radnet I may, at any time, prepay all of the
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet I and the satisfaction of
each of the following conditions:

                           (a) Radnet I and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet I and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                   5. The closing of the restructuring of the Radnet I Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet I hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                                       3
<PAGE>

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                  8. Radnet I hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                                       4
<PAGE>

                                                                       #2785-002

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving
effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                  LEVERAGE RATIO          PERIOD
                                  --------------          ------

                                    4.50:1.0        04/30/05 - 10/30/05
                                    4.30:1.0        10/31/05 - 10/30/06
                                    4.00:1.0        10/31/06 - 10/30/07
                                    3.80:1.0        10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means,

                                       5
<PAGE>

                                                                       #2785-002

as of any date of determination, without duplication, the sum of (a) the
outstanding aggregate amount of the obligations for borrowed money, (b) the
outstanding principal amount of capital leases, (c) the outstanding principal
amount of purchase money indebtedness, (d) the outstanding principal amount of
funded debt, and (e) the outstanding principal amount of all obligations owing
to GECC, DVI and USBPS; all as determined for the Company and its subsidiaries
on a consolidated basis without duplication and in accordance with generally
accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantors hereby affirm and restate their Guarantees as related
to this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet I, the Company and the Guarantors each represent
and warrant that each has been represented by an attorney of its choice and is
fully aware of the terms contained in this Agreement and AMENDED AND RESTATED
RIDER A to which it is a party which was voluntarily entered into without
coercion or duress of any kind.

                  12. Radnet I represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet I to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by

                                       6
<PAGE>

                                                                       #2785-002

Radnet I of this Agreement and the AMENDED AND RESTATED RIDER A will not violate
any of Radnet I's Articles of Incorporation, Articles of Formation, Partnership
Agreement or other agreement or law by which Radnet I is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania. BRMFS1 509512v2

                                       7
<PAGE>

                                                                       #2785-002

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #2785-002

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet I, the Company and the Guarantors hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #2785-002

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XVI, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    RADNET MANAGEMENT I, INC.

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By: ____________________________________

Radnet Management, Inc., Guarantor

By: ____________________________________

                                       10
<PAGE>

                                                                       #2785-001

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XIV, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management I, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025 ("RADNET
I"), and such other signatories hereto.

                  WHEREAS, on or about August 31, 2000, Radnet I executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #2785-001 dated August 31,
2000 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet I to DVI (collectively the "OBLIGATIONS"), Radnet I,
pursuant to a Master Security Agreement dated on or about August 31, 2000 (the
"SECURITY AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet I to DVI, Radnet I delivered to DVI the guarantees (the
"GUARANTEES") of Primedex Health Systems, Inc. and Radnet Management, Inc. (each
a "GUARANTOR", and collectively the "GUARANTORS") (the Guarantees together with
the Loan and ancillary documents are, collectively, the "LOAN DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XIV, L.L.C. ("DVI XIV")
and thereafter pursuant to an Amended and Restated Indenture, DVI XIV granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #2785-001

noteholder which purchased asset backed promissory notes issued by DVI XIV (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet I or certain
affiliates of Radnet I to this and other DVI securitizations (collectively the
"RELATED LOANS"); WHEREAS, Radnet I is in default under the terms of the Loan;

                  WHEREAS, Radnet I has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet I and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet I and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet I acknowledges that it is duly indebted to the
Trustee in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and
has no defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #2785-001

"AMENDED AND RESTATED RIDER A"). Radnet I may, at any time, prepay all of the
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet I and the satisfaction of
each of the following conditions:

                           (a) Radnet I and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet I and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet I Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                   6. Radnet I hereby acknowledges and agrees that it has no,
and will not assert any, defenses, counterclaims or offsets to the Loan and
AMENDED AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds
a first-priority security interest in the Collateral.

                                       3
<PAGE>

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                  8. Radnet I hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                                       4
<PAGE>

                                                                       #2785-001

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving
effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIOD
                                 --------------          ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means,

                                       5
<PAGE>

                                                                       #2785-001

as of any date of determination, without duplication, the sum of (a) the
outstanding aggregate amount of the obligations for borrowed money, (b) the
outstanding principal amount of capital leases, (c) the outstanding principal
amount of purchase money indebtedness, (d) the outstanding principal amount of
funded debt, and (e) the outstanding principal amount of all obligations owing
to GECC, DVI and USBPS; all as determined for the Company and its subsidiaries
on a consolidated basis without duplication and in accordance with generally
accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantors hereby affirm and restate their Guarantees as related
to this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet I, the Company and the Guarantors each represent
and warrant that each has been represented by an attorney of its choice and is
fully aware of the terms contained in this Agreement and AMENDED AND RESTATED
RIDER A to which it is a party which was voluntarily entered into without
coercion or duress of any kind.

                  12. Radnet I represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet I to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by

                                       6
<PAGE>

                                                                       #2785-001

Radnet I of this Agreement and the AMENDED AND RESTATED RIDER A will not violate
any of Radnet I's Articles of Incorporation, Articles of Formation, Partnership
Agreement or other agreement or law by which Radnet I is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                           U.S. Bank Portfolio Services
                           1310 Madrid Street, Suite 103
                           Marshall, MN 56258
                           Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #2785-001

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #2785-001

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet I, the Company and the Guarantors hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #2785-001

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XIV, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET MANAGEMENT I, INC.

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By: ____________________________________

Radnet Management, Inc., Guarantor

By: ____________________________________

                                       10
<PAGE>

                                                                       #3564-001

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVIII, L.L.C. and
as Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street,
Suite 103, Marshall, Minnesota 56258 ("USBPS") and Radnet Sub, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about July 2, 2002, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Amended, Restated and
Consolidated Master Loan Agreement collectively with the Secured Promissory Note
Number #3564-001 dated July 2, 2002 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Amended, Restated and Consolidated Master Security Agreement dated on or
about July 2, 2002 (the "SECURITY AGREEMENT"), granted DVI a first priority
security interest in certain Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVIII, L.L.C. ("DVI
XVIII") and thereafter pursuant to an Amended and Restated Indenture, DVI XVIII
granted a first priority security interest in and

<PAGE>

pledged all of the Loan Documents in favor of U.S. Bank, N.A., as Trustee, for
the benefit of a noteholder which purchased asset backed promissory notes issued
by DVI XVIII (the "Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                                       2
<PAGE>

                   3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay
all of the then outstanding Obligations subject to an additional prepayment fee
of 2% of such Obligations. Partial prepayments of the Obligations shall not be
permitted at any time.

                     4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the
satisfaction of each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                   5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                   6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                                       3
<PAGE>

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                                       4
<PAGE>

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving
effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                     LEVERAGE RATIO                     Period
                     --------------                     ------

                        4.50:1.0                 04/30/05 - 10/30/05
                        4.30:1.0                 10/31/05 - 10/30/06
                        4.00:1.0                 10/31/06 - 10/30/07
                        3.80:1.0                 10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,

                                       5
<PAGE>

without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations owing to GECC, DVI and USBPS; all as
determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of Radnet's Articles of
Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which Radnet is bound.

                                       6
<PAGE>

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                            U.S. Bank Portfolio Services
                            1310 Madrid Street, Suite 103
                            Marshall, MN 56258
                            Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE

                                       8
<PAGE>

SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS
CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                    LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
                                    PORTFOLIO SERVICES, AS SUCCESSOR SERVICER
                                    FOR DVI RECEIVABLES XVIII, L.L.C. AND AS
                                    AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    RADNET SUB, INC.

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:_____________________________________

                                       10
<PAGE>

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVIII, L.L.C. and
as Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street,
Suite 103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about May 1, 2002, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Amended and Restated Secured Promissory Note Number
#3502-005 dated July 2, 2002 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about May 1, 2002 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVIII, L.L.C. ("DVI
XVIII") and thereafter pursuant to an Amended and Restated Indenture, DVI XVIII
granted a first priority security interest in and pledged all of the Loan
Documents in favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

noteholder which purchased asset backed promissory notes issued by DVI XVIII
(the "Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided. NOW,

                  THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay

                                       2
<PAGE>

all of the then outstanding Obligations subject to an additional prepayment fee
of 2% of such Obligations. Partial prepayments of the Obligations shall not be
permitted at any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                                       3
<PAGE>

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving

                                       4
<PAGE>

effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                       LEVERAGE RATIO                     Period
                       --------------                     ------

                         4.50:1.0                 04/30/05 - 10/30/05
                         4.30:1.0                 10/31/05 - 10/30/06
                         4.00:1.0                 10/31/06 - 10/30/07
                         3.80:1.0                 10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations owing to GECC, DVI and USBPS; all as
determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                                       5
<PAGE>

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of Radnet's Articles of
Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which Radnet is bound.

                                       6
<PAGE>

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                            U.S. Bank Portfolio Services
                            1310 Madrid Street, Suite 103
                            Marshall, MN 56258
                            Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                    LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
                                    PORTFOLIO SERVICES, AS SUCCESSOR SERVICER
                                    FOR DVI RECEIVABLES XVIII, L.L.C. AND AS
                                    AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By:________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:________________________________________

                                       10
<PAGE>

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XIX, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about May 1, 2002, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Amended and Restated Secured Promissory Note Number
#3502-002 dated July 2, 2002 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about May 1, 2002 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XIX, L.L.C. ("DVI XIX")
and thereafter pursuant to an Amended and Restated Indenture, DVI XIX granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a noteholder which
purchased asset backed promissory notes issued by DVI XIX (the "Noteholder");

<PAGE>

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay
all of the then outstanding Obligations subject to an additional prepayment fee
of 2% of such Obligations. Partial prepayments of the Obligations shall not be
permitted at any time.

                                       2
<PAGE>

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                                       3
<PAGE>

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving

                                       4
<PAGE>

effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                        LEVERAGE RATIO                     Period
                        --------------                     ------

                          4.50:1.0                 04/30/05 -   10/30/05
                          4.30:1.0                 10/31/05 -   10/30/06
                          4.00:1.0                 10/31/06 -   10/30/07
                          3.80:1.0                 10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations owing to GECC, DVI and USBPS; all as

                                       5
<PAGE>

determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of Radnet's Articles of
Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which Radnet is bound.

                                       6
<PAGE>

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                             U.S. Bank Portfolio Services
                             1310 Madrid Street, Suite 103
                             Marshall, MN 56258
                             Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                    LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
                                    PORTFOLIO SERVICES, AS SUCCESSOR SERVICER
                                    FOR DVI RECEIVABLES XIX, L.L.C. AND AS AGENT
                                    FOR U.S. BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:_____________________________________

                                       10
<PAGE>

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVIII, L.L.C. and
as Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street,
Suite 103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about May 1, 2002, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Amended and Restated Secured Promissory Note Number
#3502-001 dated May 1, 2002 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about May 1, 2002 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVIII, L.L.C. ("DVI
XVIII") and thereafter pursuant to an Amended and Restated Indenture, DVI XVIII
granted a first priority security interest in and pledged all of the Loan
Documents in favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

noteholder which purchased asset backed promissory notes issued by DVI XVIII
(the "Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay
all of the then outstanding Obligations subject to an additional prepayment fee
of 2% of such Obligations. Partial prepayments of the Obligations shall not be
permitted at any time.

                                       2
<PAGE>

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                                       3
<PAGE>

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving

                                       4
<PAGE>

effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                             LEVERAGE RATIO                     Period
                             --------------                     ------

                               4.50:1.0                 04/30/05 -   10/30/05
                               4.30:1.0                 10/31/05 -   10/30/06
                               4.00:1.0                 10/31/06 -   10/30/07
                               3.80:1.0                 10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations owing to GECC, DVI and USBPS; all as
determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                                       5
<PAGE>

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of Radnet's Articles of
Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which Radnet is bound.

                                       6
<PAGE>

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                    LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
                                    PORTFOLIO SERVICES, AS SUCCESSOR SERVICER
                                    FOR DVI RECEIVABLES XVIII, L.L.C. AND AS
                                    AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By:________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:________________________________________

                                       10
<PAGE>

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Servicer for DVI Receivables XV, L.L.C. and as Agent for
U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite 103,
Marshall, Minnesota 56258 ("USBPS") and Diagnostic Imaging Services, Inc., a
corporation, with offices at 27699 Jefferson Ave Ste 110, Temecula, CA 92590
("DIS"), and such other signatories hereto.

                  WHEREAS, on or about March 20, 2002, DIS executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Amended and Restated Secured Promissory Note Number
#3441-012 dated April 1, 2003 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of DIS to DVI (collectively the "OBLIGATIONS"), DIS, pursuant to a
Master Security Agreement dated on or about March 20, 2002 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of DIS to DVI, DIS delivered to DVI the guarantee (the "GUARANTEE")
of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE" together
with the Loan and ancillary documents are, collectively the "LOAN DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XV, L.L.C. ("DVI XV")
and thereafter pursuant to an Amended and Restated Indenture, DVI XV granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a noteholder which
purchased asset backed promissory notes issued by DVI XV (the "Noteholder");

<PAGE>

                  WHEREAS, DVI contributed other Loans with DIS or certain
affiliates of DIS to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, DIS is in default under the terms of the Loan;

                  WHEREAS, DIS has requested USBPS to modify the Loan to reflect
an adjustment in payments;

                  WHEREAS, DIS and/or certain of its affiliates have agreed to
modify the Related Loans;

                  WHEREAS, DIS and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. DIS acknowledges that it is duly indebted to the Trustee in
the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). DIS may, at any time, prepay all
of the then outstanding Obligations subject to an additional prepayment fee of
2% of such Obligations. Partial prepayments of the Obligations shall not be
permitted at any time.

                                       2
<PAGE>

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by DIS and the satisfaction of each
of the following conditions:

                           (a) DIS and/or its affiliates shall have entered into
                  agreements on similar terms to this Agreement and otherwise in
                  form and substance satisfactory to USBPS, relating to the
                  Related Loans (the "Related Loan Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) DIS and/or its affiliates shall have entered into
                  the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the DIS Loan is further
subject to delivery to USBPS of all of the following, each in form and substance
satisfactory to USBPS and its counsel: (a) The executed AMENDED AND RESTATED
RIDER A; (b) An executed copy of this Agreement; (c) Such other documents,
including UCC financing statements as USBPS reasonably requests.

                  6. DIS hereby acknowledges and agrees that it has no, and will
not assert any, defenses, counterclaims or offsets to the Loan and AMENDED AND
RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                                       3
<PAGE>

                  8. DIS hereby releases the Noteholder, USBPS individually and
as agent for the Trustee and the special purpose entities for which the Trustee
holds collateral, from and against any claims, loss or damage of any kind or
nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving

                                       4
<PAGE>

effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                           LEVERAGE RATIO                     Period
                           --------------                     ------

                             4.50:1.0                 04/30/05 -   10/30/05
                             4.30:1.0                 10/31/05 -   10/30/06
                             4.00:1.0                 10/31/06 -   10/30/07
                             3.80:1.0                 10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations owing to GECC, DVI and USBPS; all as

                                       5
<PAGE>

determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. DIS, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. DIS represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of DIS to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by DIS of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of DIS's Articles of
Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which DIS is bound.

                                       6
<PAGE>

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                              U.S. Bank Portfolio Services
                              1310 Madrid Street, Suite 103
                              Marshall, MN 56258
                              Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. DIS, the Company and the Guarantor hereby release USBPS,
the Trustee, and the Noteholders from and against any claim, loss, or damage
arising out of the negotiation execution, and performance of the Loan or related
matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                    LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
                                    PORTFOLIO SERVICES, AS SERVICER FOR DVI
                                    RECEIVABLES XV, L.L.C. AND AS AGENT FOR U.S.
                                    BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    DIAGNOSTIC IMAGING SERVICES, INC.

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:_________________________________________

                                       10
<PAGE>

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVIII, L.L.C. and
as Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street,
Suite 103, Marshall, Minnesota 56258 ("USBPS") and Diagnostic Imaging Services,
Inc., a corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("DIS"), and such other signatories hereto.

                  WHEREAS, on or about March 20, 2002, DIS executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3441-008 dated September
24, 2002 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of DIS to DVI (collectively the "OBLIGATIONS"), DIS, pursuant to a
Master Security Agreement dated on or about March 20, 2002 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of DIS to DVI, DIS delivered to DVI the guarantee (the "GUARANTEE")
of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE" together
with the Loan and ancillary documents are, collectively the "LOAN DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVIII, L.L.C. ("DVI
XVIII") and thereafter pursuant to an Amended and Restated Indenture, DVI XVIII
granted a first priority security interest in and pledged all of the Loan
Documents in favor of U.S. Bank, N.A., as Trustee, for the benefit of a
noteholder which purchased asset backed promissory notes issued by DVI XVIII
(the "Noteholder");

<PAGE>

                  WHEREAS, DVI contributed other Loans with DIS or certain
affiliates of DIS to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, DIS is in default under the terms of the Loan;

                  WHEREAS, DIS has requested USBPS to modify the Loan to reflect
an adjustment in payments;

                  WHEREAS, DIS and/or certain of its affiliates have agreed to
modify the Related Loans;

                  WHEREAS, DIS and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. DIS acknowledges that it is duly indebted to the Trustee in
the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). DIS may, at any time, prepay all
of the then outstanding Obligations subject to an additional prepayment fee of

                                       2
<PAGE>

2% of such Obligations. Partial prepayments of the Obligations shall not be
permitted at any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by DIS and the satisfaction of each
of the following conditions:

                           (a) DIS and/or its affiliates shall have entered into
                  agreements on similar terms to this Agreement and otherwise in
                  form and substance satisfactory to USBPS, relating to the
                  Related Loans (the "Related Loan Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) DIS and/or its affiliates shall have entered into
                  the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the DIS Loan is further
subject to delivery to USBPS of all of the following, each in form and substance
satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. DIS hereby acknowledges and agrees that it has no, and will
not assert any, defenses, counterclaims or offsets to the Loan and AMENDED AND
RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                                       3
<PAGE>

                  8. DIS hereby releases the Noteholder, USBPS individually and
as agent for the Trustee and the special purpose entities for which the Trustee
holds collateral, from and against any claims, loss or damage of any kind or
nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving

                                       4
<PAGE>

effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                          LEVERAGE RATIO                     Period
                          --------------                     ------

                            4.50:1.0                 04/30/05 -   10/30/05
                            4.30:1.0                 10/31/05 -   10/30/06
                            4.00:1.0                 10/31/06 -   10/30/07
                            3.80:1.0                 10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding

                                       5
<PAGE>

principal amount of all obligations owing to GECC, DVI and USBPS; all as
determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. DIS, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. DIS represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of DIS to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by DIS of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of DIS's Articles of
Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which DIS is bound.

                                       6
<PAGE>

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                             U.S. Bank Portfolio Services
                             1310 Madrid Street, Suite 103
                             Marshall, MN 56258
                             Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. DIS, the Company and the Guarantor hereby release USBPS,
the Trustee, and the Noteholders from and against any claim, loss, or damage
arising out of the negotiation execution, and performance of the Loan or related
matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                    LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
                                    PORTFOLIO SERVICES, AS SUCCESSOR SERVICER
                                    FOR DVI RECEIVABLES XVIII, L.L.C. AND AS
                                    AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    DIAGNOSTIC IMAGING SERVICES, INC.

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:_________________________________________

                                       10
<PAGE>

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVIII, L.L.C. and
as Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street,
Suite 103, Marshall, Minnesota 56258 ("USBPS") and Diagnostic Imaging Services,
Inc., a corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("DIS"), and such other signatories hereto.

                  WHEREAS, on or about March 20, 2002, DIS executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Amended and Restated Secured Promissory Note Number
#3441-005 dated July 2, 2002 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of DIS to DVI (collectively the "OBLIGATIONS"), DIS, pursuant to a
Master Security Agreement dated on or about March 20, 2002 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of DIS to DVI, DIS delivered to DVI the guarantee (the "GUARANTEE")
of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE" together
with the Loan and ancillary documents are, collectively the "LOAN DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVIII, L.L.C. ("DVI
XVIII") and thereafter pursuant to an Amended and Restated Indenture, DVI XVIII
granted a first priority security interest in and pledged all of the Loan
Documents in favor of U.S. Bank, N.A., as Trustee, for the benefit of a
noteholder which purchased asset backed promissory notes issued by DVI XVIII
(the "Noteholder");

<PAGE>

                  WHEREAS, DVI contributed other Loans with DIS or certain
affiliates of DIS to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, DIS is in default under the terms of the Loan;

                  WHEREAS, DIS has requested USBPS to modify the Loan to reflect
an adjustment in payments;

                  WHEREAS, DIS and/or certain of its affiliates have agreed to
modify the Related Loans;

                  WHEREAS, DIS and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. DIS acknowledges that it is duly indebted to the Trustee in
the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). DIS may, at any time, prepay all

                                       2
<PAGE>

of the then outstanding Obligations subject to an additional prepayment fee of
2% of such Obligations. Partial prepayments of the Obligations shall not be
permitted at any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by DIS and the satisfaction of each
of the following conditions:

                           (a) DIS and/or its affiliates shall have entered into
                  agreements on similar terms to this Agreement and otherwise in
                  form and substance satisfactory to USBPS, relating to the
                  Related Loans (the "Related Loan Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) DIS and/or its affiliates shall have entered into
                  the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the DIS Loan is further
subject to delivery to USBPS of all of the following, each in form and substance
satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. DIS hereby acknowledges and agrees that it has no, and will
not assert any, defenses, counterclaims or offsets to the Loan and AMENDED AND
RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                                       3
<PAGE>

                  8. DIS hereby releases the Noteholder, USBPS individually and
as agent for the Trustee and the special purpose entities for which the Trustee
holds collateral, from and against any claims, loss or damage of any kind or
nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving

                                       4
<PAGE>

effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                         LEVERAGE RATIO                     Period
                         --------------                     ------

                           4.50:1.0                 04/30/05 -   10/30/05
                           4.30:1.0                 10/31/05 -   10/30/06
                           4.00:1.0                 10/31/06 -   10/30/07
                           3.80:1.0                 10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations owing to GECC, DVI and USBPS; all as

                                       5
<PAGE>

determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. DIS, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. DIS represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of DIS to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by DIS of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of DIS's Articles of
Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which DIS is bound.

                                       6
<PAGE>

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                            U.S. Bank Portfolio Services
                            1310 Madrid Street, Suite 103
                            Marshall, MN 56258
                            Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. DIS, the Company and the Guarantor hereby release USBPS,
the Trustee, and the Noteholders from and against any claim, loss, or damage
arising out of the negotiation execution, and performance of the Loan or related
matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                    LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
                                    PORTFOLIO SERVICES, AS SUCCESSOR SERVICER
                                    FOR DVI RECEIVABLES XVIII, L.L.C. AND AS
                                    AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    DIAGNOSTIC IMAGING SERVICES, INC.

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:
Primedex Health Systems, Inc., Guarantor

By:_________________________________________

                                       10
<PAGE>

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XIX, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Diagnostic Imaging Services, Inc.,
a corporation, with offices at 4334 Central Avenue, Riverside, CA 92508 ("DIS"),
and such other signatories hereto.

                  WHEREAS, on or about March 20, 2002, DIS executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3441-003 dated March 20,
2002 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of DIS to DVI (collectively the "OBLIGATIONS"), DIS, pursuant to a
Master Security Agreement dated on or about March 20, 2002 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of DIS to DVI, DIS delivered to DVI the guarantee (the "GUARANTEE")
of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE" together
with the Loan and ancillary documents are, collectively the "LOAN DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XIX, L.L.C. ("DVI XIX")
and thereafter pursuant to an Amended and Restated Indenture, DVI XIX granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a noteholder which
purchased asset backed promissory notes issued by DVI XIX (the "Noteholder");

<PAGE>

                  WHEREAS, DVI contributed other Loans with DIS or certain
affiliates of DIS to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, DIS is in default under the terms of the Loan;

                  WHEREAS, DIS has requested USBPS to modify the Loan to reflect
an adjustment in payments;

                  WHEREAS, DIS and/or certain of its affiliates have agreed to
modify the Related Loans;

                  WHEREAS, DIS and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. DIS acknowledges that it is duly indebted to the Trustee in
the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). DIS may, at any time, prepay all

                                       2
<PAGE>

of the then outstanding Obligations subject to an additional prepayment fee of
2% of such Obligations. Partial prepayments of the Obligations shall not be
permitted at any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by DIS and the satisfaction of each
of the following conditions:

                           (a) DIS and/or its affiliates shall have entered into
                  agreements on similar terms to this Agreement and otherwise in
                  form and substance satisfactory to USBPS, relating to the
                  Related Loans (the "Related Loan Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) DIS and/or its affiliates shall have entered into
                  the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the DIS Loan is further
subject to delivery to USBPS of all of the following, each in form and substance
satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. DIS hereby acknowledges and agrees that it has no, and will
not assert any, defenses, counterclaims or offsets to the Loan and AMENDED AND
RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                                       3
<PAGE>

                  8. DIS hereby releases the Noteholder, USBPS individually and
as agent for the Trustee and the special purpose entities for which the Trustee
holds collateral, from and against any claims, loss or damage of any kind or
nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving

                                       4
<PAGE>

effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                         LEVERAGE RATIO                     Period
                         --------------                     ------

                           4.50:1.0                 04/30/05 -   10/30/05
                           4.30:1.0                 10/31/05 -   10/30/06
                           4.00:1.0                 10/31/06 -   10/30/07
                           3.80:1.0                 10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)

                                       5
<PAGE>

the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations owing to GECC, DVI and USBPS; all as
determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied. (viii) NAME
CHANGES, ETC. The Company agrees that it shall not change its name or
jurisdiction of organization without giving 30 days prior written notice to
USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. DIS, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. DIS represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of DIS to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by DIS of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of DIS's Articles of
Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which DIS is bound.

                                       6
<PAGE>

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                           U.S. Bank Portfolio Services
                           1310 Madrid Street, Suite 103
                           Marshall, MN 56258
                           Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. DIS, the Company and the Guarantor hereby release USBPS,
the Trustee, and the Noteholders from and against any claim, loss, or damage
arising out of the negotiation execution, and performance of the Loan or related
matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                    LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
                                    PORTFOLIO SERVICES, AS SUCCESSOR SERVICER
                                    FOR DVI RECEIVABLES XIX, L.L.C. AND AS AGENT
                                    FOR U.S. BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    DIAGNOSTIC IMAGING SERVICES, INC.

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:
Primedex Health Systems, Inc., Guarantor

By:_________________________________________

                                       10
<PAGE>

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVII, L.L.C. and
as Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street,
Suite 103, Marshall, Minnesota 56258 ("USBPS") and Diagnostic Imaging Services,
Inc., a corporation, with offices at 3901 E. Las Posas Road Ste 104, Camarillo,
CA 93010 ("DIS"), and such other signatories hereto.

                  WHEREAS, on or about March 20, 2002, DIS executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3441-001 dated March 20,
2002 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of DIS to DVI (collectively the "OBLIGATIONS"), DIS, pursuant to a
Master Security Agreement dated on or about March 20, 2002 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of DIS to DVI, DIS delivered to DVI the guarantee (the "GUARANTEE")
of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE" together
with the Loan and ancillary documents are, collectively the "LOAN DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVII, L.L.C. ("DVI
XVII") and thereafter pursuant to an Amended and Restated Indenture, DVI XVII
granted a first priority security interest in and pledged all of the Loan
Documents in favor of U.S. Bank, N.A., as Trustee, for the benefit of a
noteholder which purchased asset backed promissory notes issued by DVI XVII (the
"Noteholder");

<PAGE>

                  WHEREAS, DVI contributed other Loans with DIS or certain
affiliates of DIS to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, DIS is in default under the terms of the Loan;

                  WHEREAS, DIS has requested USBPS to modify the Loan to reflect
an adjustment in payments;

                  WHEREAS, DIS and/or certain of its affiliates have agreed to
modify the Related Loans;

                  WHEREAS, DIS and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. DIS acknowledges that it is duly indebted to the Trustee in
the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). DIS may, at any time, prepay all

                                       2
<PAGE>

of the then outstanding Obligations subject to an additional prepayment fee of
2% of such Obligations. Partial prepayments of the Obligations shall not be
permitted at any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by DIS and the satisfaction of each
of the following conditions:

                           (a) DIS and/or its affiliates shall have entered into
                  agreements on similar terms to this Agreement and otherwise in
                  form and substance satisfactory to USBPS, relating to the
                  Related Loans (the "Related Loan Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) DIS and/or its affiliates shall have entered into
                  the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the DIS Loan is further
subject to delivery to USBPS of all of the following, each in form and substance
satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. DIS hereby acknowledges and agrees that it has no, and will
not assert any, defenses, counterclaims or offsets to the Loan and AMENDED AND
RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                                       3
<PAGE>

                  8. DIS hereby releases the Noteholder, USBPS individually and
as agent for the Trustee and the special purpose entities for which the Trustee
holds collateral, from and against any claims, loss or damage of any kind or
nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving
effect to any such payment, (a) the Company may make Distributions to Primedex

                                       4
<PAGE>

Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                        LEVERAGE RATIO                     Period
                        --------------                     ------

                          4.50:1.0                 04/30/05 -   10/30/05
                          4.30:1.0                 10/31/05 -   10/30/06
                          4.00:1.0                 10/31/06 -   10/30/07
                          3.80:1.0                 10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding

                                       5
<PAGE>

principal amount of all obligations owing to GECC, DVI and USBPS; all as
determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. DIS, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. DIS represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of DIS to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by DIS of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of DIS's Articles of
Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which DIS is bound.

                                       6
<PAGE>

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                           U.S. Bank Portfolio Services
                           1310 Madrid Street, Suite 103
                           Marshall, MN 56258
                           Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. DIS, the Company and the Guarantor hereby release USBPS,
the Trustee, and the Noteholders from and against any claim, loss, or damage
arising out of the negotiation execution, and performance of the Loan or related
matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                    LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
                                    PORTFOLIO SERVICES, AS SUCCESSOR SERVICER
                                    FOR DVI RECEIVABLES XVII, L.L.C. AND AS
                                    AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    DIAGNOSTIC IMAGING SERVICES, INC.

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:
Primedex Health Systems, Inc., Guarantor

By:_________________________________________

                                       10
<PAGE>

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Servicer for DVI Receivables XV, L.L.C. and as Agent for
U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite 103,
Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a corporation,
with offices at 1516 Cotner Avenue, Los Angeles, CA 90025 ("RADNET"), and such
other signatories hereto.

                  WHEREAS, on or about July 11, 2001, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3155-019 dated January 14,
2002 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about July 11, 2001 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XV, L.L.C. ("DVI XV")
and thereafter pursuant to an Amended and Restated Indenture, DVI XV granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a noteholder which
purchased asset backed promissory notes issued by DVI XV (the "Noteholder");

<PAGE>

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay

                                       2
<PAGE>

all of the then outstanding Obligations subject to an additional prepayment fee
of 2% of such Obligations. Partial prepayments of the Obligations shall not be
permitted at any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel: (a) The executed AMENDED AND
RESTATED RIDER A; (b) An executed copy of this Agreement; (c) Such other
documents, including UCC financing statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                                       3
<PAGE>

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving

                                       4
<PAGE>

effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                         LEVERAGE RATIO                     Period
                         --------------                     ------

                           4.50:1.0                 04/30/05 -   10/30/05
                           4.30:1.0                 10/31/05 -   10/30/06
                           4.00:1.0                 10/31/06 -   10/30/07
                           3.80:1.0                 10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)

                                       5
<PAGE>

the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations owing to GECC, DVI and USBPS; all as
determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of Radnet's Articles of
Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which Radnet is bound.

                                       6
<PAGE>

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                    LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
                                    PORTFOLIO SERVICES, AS SERVICER FOR DVI
                                    RECEIVABLES XV, L.L.C. AND AS AGENT FOR U.S.
                                    BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:
Primedex Health Systems, Inc., Guarantor

By:_________________________________________

                                       10
<PAGE>

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Servicer for DVI Receivables XV, L.L.C. and as Agent for
U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite 103,
Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a corporation,
with offices at 1516 Cotner Avenue, Los Angeles, CA 90025 ("RADNET"), and such
other signatories hereto.

                  WHEREAS, on or about July 11, 2001, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3155-018 dated December
17, 2001 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about July 11, 2001 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XV, L.L.C. ("DVI XV")
and thereafter pursuant to an Amended and Restated Indenture, DVI XV granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a noteholder which
purchased asset backed promissory notes issued by DVI XV (the "Noteholder");

<PAGE>

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay

                                       2
<PAGE>

all of the then outstanding Obligations subject to an additional prepayment fee
of 2% of such Obligations. Partial prepayments of the Obligations shall not be
permitted at any time.

                     4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the
satisfaction of each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                                       3
<PAGE>

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving

                                       4
<PAGE>

effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                       LEVERAGE RATIO                     Period
                       --------------                     ------

                         4.50:1.0                 04/30/05 -   10/30/05
                         4.30:1.0                 10/31/05 -   10/30/06
                         4.00:1.0                 10/31/06 -   10/30/07
                         3.80:1.0                 10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations owing to GECC, DVI and USBPS; all as

                                       5
<PAGE>

determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of Radnet's Articles of
Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which Radnet is bound.

                                       6
<PAGE>

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                         U.S. Bank Portfolio Services
                         1310 Madrid Street, Suite 103
                         Marshall, MN 56258
                         Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                    LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
                                    PORTFOLIO SERVICES, AS SERVICER FOR DVI
                                    RECEIVABLES XV, L.L.C. AND AS AGENT FOR U.S.
                                    BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:
Primedex Health Systems, Inc., Guarantor

By:_________________________________________

                                       10
<PAGE>

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Servicer for DVI Receivables XV, L.L.C. and as Agent for
U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite 103,
Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a corporation,
with offices at 1516 Cotner Avenue, Los Angeles, CA 90025 ("RADNET"), and such
other signatories hereto.

                  WHEREAS, on or about July 11, 2001, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3155-017 dated December
17, 2001 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about July 11, 2001 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XV, L.L.C. ("DVI XV")
and thereafter pursuant to an Amended and Restated Indenture, DVI XV granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a noteholder which
purchased asset backed promissory notes issued by DVI XV (the "Noteholder");

<PAGE>

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay

                                       2
<PAGE>

all of the then outstanding Obligations subject to an additional prepayment fee
of 2% of such Obligations. Partial prepayments of the Obligations shall not be
permitted at any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                                       3
<PAGE>

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving

                                       4
<PAGE>

effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                      LEVERAGE RATIO                     Period
                      --------------                     ------

                        4.50:1.0                 04/30/05 -   10/30/05
                        4.30:1.0                 10/31/05 -   10/30/06
                        4.00:1.0                 10/31/06 -   10/30/07
                        3.80:1.0                 10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding

                                       5
<PAGE>

principal amount of all obligations owing to GECC, DVI and USBPS; all as
determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of Radnet's Articles of
Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which Radnet is bound.

                                       6
<PAGE>

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                            U.S. Bank Portfolio Services
                            1310 Madrid Street, Suite 103
                            Marshall, MN 56258
                            Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                    LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
                                    PORTFOLIO SERVICES, AS SERVICER FOR DVI
                                    RECEIVABLES XV, L.L.C. AND AS AGENT FOR U.S.
                                    BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:
Primedex Health Systems, Inc., Guarantor

By:_________________________________________

                                       10
<PAGE>

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Servicer for DVI Receivables XV, L.L.C. and as Agent for
U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite 103,
Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a corporation,
with offices at 1516 Cotner Avenue, Los Angeles, CA 90025 ("RADNET"), and such
other signatories hereto.

                  WHEREAS, on or about July 11, 2001, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3155-014 dated August 15,
2001 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about July 11, 2001 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XV, L.L.C. ("DVI XV")
and thereafter pursuant to an Amended and Restated Indenture, DVI XV granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a noteholder which
purchased asset backed promissory notes issued by DVI XV (the "Noteholder");

<PAGE>

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay
all of the then outstanding Obligations subject to an additional prepayment fee
of 2% of such Obligations. Partial prepayments of the Obligations shall not be
permitted at any time.

                                       2
<PAGE>

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                                       3
<PAGE>

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving

                                       4
<PAGE>

effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                       LEVERAGE RATIO                     Period
                       --------------                     ------

                         4.50:1.0                 04/30/05 -   10/30/05
                         4.30:1.0                 10/31/05 -   10/30/06
                         4.00:1.0                 10/31/06 -   10/30/07
                         3.80:1.0                 10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations owing to GECC, DVI and USBPS; all as

                                       5
<PAGE>

determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of Radnet's Articles of

                                       6
<PAGE>

Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                            U.S. Bank Portfolio Services
                            1310 Madrid Street, Suite 103
                            Marshall, MN 56258
                            Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                    LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
                                    PORTFOLIO SERVICES, AS SERVICER FOR DVI
                                    RECEIVABLES XV, L.L.C. AND AS AGENT FOR U.S.
                                    BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:
Primedex Health Systems, Inc., Guarantor

By:_________________________________________

                                       10
<PAGE>

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVII, L.L.C. and
as Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street,
Suite 103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about July 11, 2001, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3155-013 dated September
19, 2001 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about July 11, 2001 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVII, L.L.C. ("DVI
XVII") and thereafter pursuant to an Amended and Restated Indenture, DVI XVII
granted a first priority security interest in and pledged all of the Loan
Documents in favor of U.S. Bank, N.A., as Trustee, for the benefit of a
noteholder which purchased asset backed promissory notes issued by DVI XVII (the
"Noteholder");

<PAGE>

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
                  is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay

                                       2
<PAGE>

all of the then outstanding Obligations subject to an additional prepayment fee
of 2% of such Obligations. Partial prepayments of the Obligations shall not be
permitted at any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                                       3
<PAGE>

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving

                                       4
<PAGE>

effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                       LEVERAGE RATIO                     Period
                       --------------                     ------

                         4.50:1.0                 04/30/05 -   10/30/05
                         4.30:1.0                 10/31/05 -   10/30/06
                         4.00:1.0                 10/31/06 -   10/30/07
                         3.80:1.0                 10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations owing to GECC, DVI and USBPS; all as

                                       5
<PAGE>

determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of Radnet's Articles of
Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which Radnet is bound.

                                       6
<PAGE>

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                         U.S. Bank Portfolio Services
                         1310 Madrid Street, Suite 103
                         Marshall, MN 56258
                         Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                    LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
                                    PORTFOLIO SERVICES, AS SUCCESSOR SERVICER
                                    FOR DVI RECEIVABLES XVII, L.L.C. AND AS
                                    AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:
Primedex Health Systems, Inc., Guarantor

By:_________________________________________

                                       10
<PAGE>

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVIII, L.L.C. and
as Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street,
Suite 103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about July 11, 2001, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3155-011 dated September
13, 2001 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about July 11, 2001 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVIII, L.L.C. ("DVI
XVIII") and thereafter pursuant to an Amended and Restated Indenture, DVI XVIII
granted a first priority security interest in and pledged all of the Loan
Documents in favor of U.S. Bank, N.A., as Trustee, for the benefit of a
noteholder which purchased asset backed promissory notes issued by DVI XVIII
(the "Noteholder");

<PAGE>

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay

                                       2
<PAGE>

all of the then outstanding Obligations subject to an additional prepayment fee
of 2% of such Obligations. Partial prepayments of the Obligations shall not be
permitted at any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                                       3
<PAGE>

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default

                                       4
<PAGE>

shall have occurred and be continuing immediately prior to or after giving
effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                         LEVERAGE RATIO                     Period
                         --------------                     ------

                           4.50:1.0                 04/30/05 -   10/30/05
                           4.30:1.0                 10/31/05 -   10/30/06
                           4.00:1.0                 10/31/06 -   10/30/07
                           3.80:1.0                 10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations owing to GECC, DVI and USBPS; all as

                                       5
<PAGE>

determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the

                                       6
<PAGE>

AMENDED AND RESTATED RIDER A will not violate any of Radnet's Articles of
Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                             U.S. Bank Portfolio Services
                             1310 Madrid Street, Suite 103
                             Marshall, MN 56258
                             Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                    LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
                                    PORTFOLIO SERVICES, AS SUCCESSOR SERVICER
                                    FOR DVI RECEIVABLES XVIII, L.L.C. AND AS
                                    AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:
Primedex Health Systems, Inc., Guarantor

By:_________________________________________

                                       10

<PAGE>

                                                                       #3155-010

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVI, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about July 11, 2001, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3155-010 dated August 15,
2001 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about July 11, 2001 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVI, L.L.C. ("DVI XVI")
and thereafter pursuant to an Amended and Restated Indenture, DVI XVI granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #3155-010

noteholder which purchased asset backed promissory notes issued by DVI XVI (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #3155-010

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                        3
<PAGE>

                                                                       #3155-010

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #3155-010

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period minus cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                              LEVERAGE RATIO                     PERIOD
                              --------------                     ------

                                4.50:1.0                 04/30/05 -   10/30/05
                                4.30:1.0                 10/31/05 -   10/30/06
                                4.00:1.0                 10/31/06 -   10/30/07
                                3.80:1.0                 10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #3155-010

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #3155-010

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                            U.S. Bank Portfolio Services
                            1310 Madrid Street, Suite 103
                            Marshall, MN 56258
                            Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #3155-010

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #3155-010

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Companyand the Guarantor hereby release USBPS,
the Trustee, and the Noteholders from and against any claim, loss, or damage
arising out of the negotiation execution, and performance of the Loan or related
matters prior to the date hereof.

                  21.This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #3155-010

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XVI, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:_____________________________________

                                       10
<PAGE>

                                                                       #3155-009

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Sub-Servicer for DVI Funding, L.L.C. and as Agent for
U.S. Bank, N.A., as Collateral Agent, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about July 11, 2001, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3155-009 dated August 15,
2001 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about July 11, 2001 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Funding, L.L.C. ("DVI FUNDING") and
thereafter pursuant to an Amended and Restated Indenture, DVI Funding granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Collateral Agent, for the

<PAGE>

                                                                       #3155-009

benefit of a noteholder which purchased asset backed promissory notes issued by
DVI Funding (the "Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the
Collateral Agent in the sum set forth on AMENDED AND RESTATED RIDER A annexed
hereto, and has no defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Collateral Agent will modify the
Loan to provide for payments to commence in accordance with the attached revised
payment schedule (the

                                       2
<PAGE>

                                                                       #3155-009

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Collateral Agent holds
a first-priority security interest in the Collateral.

                                       3
<PAGE>

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Collateral Agent and the special purpose entities for which
the Collateral Agent holds collateral, from and against any claims, loss or
damage of any kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new

                                       4
<PAGE>

                                                                       #3155-009

remedies provisions) that would be more onerous to the Company, or adversely
impact or affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving
effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period minus cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                              LEVERAGE RATIO                     PERIOD
                              --------------                     ------

                                4.50:1.0                 04/30/05 -   10/30/05
                                4.30:1.0                 10/31/05 -   10/30/06
                                4.00:1.0                 10/31/06 -   10/30/07
                                3.80:1.0                 10/31/07 -   10/30/08

                                       5
<PAGE>

                                                                       #3155-009

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations owing to GECC, DVI and USBPS; all as
determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Collateral Agent to enter
this Agreement, the Guarantor hereby affirms and restates its Guarantee as
related to this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Collateral Agent that all necessary actions on the part of
Radnet to be taken in connection

                                       6
<PAGE>

                                                                       #3155-009

with the execution, delivery and performance of this Agreement have been taken;
the performance by Radnet of this Agreement and the AMENDED AND RESTATED RIDER A
will not violate any of Radnet's Articles of Incorporation, Articles of
Formation, Partnership Agreement or other agreement or law by which Radnet is
bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                            U.S. Bank Portfolio Services
                            1310 Madrid Street, Suite 103
                            Marshall, MN 56258
                            Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                                       7
<PAGE>

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE COLLATERAL AGENT, (A) AGREE TO
SUBMIT FOR THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS
AGREEMENT AND ANY SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN
RESPECT HEREOF OR THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE
COMONWEALTH OF PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE
EASTERN DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B)
CONSENT THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE
ANY OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH
ACTION OR PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY
SUCH ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY
SUBSTANTIALLY SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY
AT ITS ADDRESS AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE
COMPLETED UPON THE EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME
SHALL HAVE BEEN POSTED AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY
EXHIBIT OR SCHEDULE SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY
OTHER MANNER PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH

                                       8
<PAGE>

                                                                       #3155-009

HEREBY UNCONDITIONALLY WAIVES ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF
ACTION BASED UPON OR ARISING OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY
EXHIBIT AND THE TRANSACTIONS CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED
DOCUMENTS, ANY DEALINGS BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT
MATTER HEREOF OR THEREOF, AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED
BETWEEN USBPS AS AGENT FOR THE TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY
IN ITS DISCRETION ENFORCE THE TERMS OF THE FORUM SELECTION PROVISIONS IN THE
LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Collateral Agent, and the Noteholders from and against any claim,
loss, or damage arising out of the negotiation execution, and performance of the
Loan or related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #3155-009

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUB-SERVICER
                                    FOR DVI FUNDING, L.L.C. AND AS AGENT
                                    FOR U.S. BANK, N.A., AS COLLATERAL AGENT

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:_____________________________________

                                       10
<PAGE>

                                                                       #3155-008

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XI, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about July 11, 2001, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3155-008 dated August 15,
2001 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about July 11, 2001 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XI, L.L.C. ("DVI XI")
and thereafter pursuant to an Amended and Restated Indenture, DVI XI granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #3155-008

noteholder which purchased asset backed promissory notes issued by DVI XI (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #3155-008

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #3155-008

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #3155-008

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                              LEVERAGE RATIO                     PERIOD
                              --------------                     ------

                                 4.50:1.0                04/30/05 -   10/30/05
                                 4.30:1.0                10/31/05 -   10/30/06
                                 4.00:1.0                10/31/06 -   10/30/07
                                 3.80:1.0                10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #3155-008

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #3155-008

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                             U.S. Bank Portfolio Services
                             1310 Madrid Street, Suite 103
                             Marshall, MN 56258
                             Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #3155-008

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #3155-008

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #3155-008

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XI, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:_____________________________________

                                       10
<PAGE>

                                                                       #3155-007

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XI, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about July 11, 2001, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3155-007 dated August 15,
2001 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about July 11, 2001 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XI, L.L.C. ("DVI XI")
and thereafter pursuant to an Amended and Restated Indenture, DVI XI granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #3155-007

noteholder which purchased asset backed promissory notes issued by DVI XI (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #3155-007

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #3155-007

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #3155-007

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period minus cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                              LEVERAGE RATIO                     PERIOD
                              --------------                     ------

                                4.50:1.0                04/30/05 -    10/30/05
                                4.30:1.0                10/31/05 -    10/30/06
                                4.00:1.0                10/31/06 -    10/30/07
                                3.80:1.0                10/31/07 -    10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #3155-007

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #3155-007

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                           U.S. Bank Portfolio Services
                           1310 Madrid Street, Suite 103
                           Marshall, MN 56258
                           Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #3155-007

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #3155-007

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #3155-007

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XI, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:_____________________________________

                                       10
<PAGE>

                                                                       #3155-006

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVI, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about July 11, 2001, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3155-006 dated July 31,
2001 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about July 11, 2001 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVI, L.L.C. ("DVI XVI")
and thereafter pursuant to an Amended and Restated Indenture, DVI XVI granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #3155-006

noteholder which purchased asset backed promissory notes issued by DVI XVI (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #3155-006

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

#3155-006 default under the Loan as modified by this Agreement, and USBPS shall
have all remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #3155-006

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period minus cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                              LEVERAGE RATIO                     PERIOD
                              --------------                     ------

                                4.50:1.0                 04/30/05 -   10/30/05
                                4.30:1.0                 10/31/05 -   10/30/06
                                4.00:1.0                 10/31/06 -   10/30/07
                                3.80:1.0                 10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #3155-006

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #3155-006

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                           U.S. Bank Portfolio Services
                           1310 Madrid Street, Suite 103
                           Marshall, MN 56258
                           Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #3155-006

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #3155-006

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #3155-006

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XVI, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:_____________________________________

                                       10
<PAGE>

                                                                       #3155-004

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Sub-Servicer for DVI Funding, L.L.C. and as Agent for
U.S. Bank, N.A., as Collateral Agent, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about July 11, 2001, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3155-004 dated July 31,
2001 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about July 11, 2001 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Funding, L.L.C. ("DVI FUNDING") and
thereafter pursuant to an Amended and Restated Indenture, DVI Funding granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Collateral Agent, for the

<PAGE>

                                                                       #3155-004

benefit of a noteholder which purchased asset backed promissory notes issued by
DVI Funding (the "Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the
Collateral Agent in the sum set forth on AMENDED AND RESTATED RIDER A annexed
hereto, and has no defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Collateral Agent will modify the
Loan to provide for payments to commence in accordance with the attached revised
payment schedule (the

                                       2
<PAGE>

                                                                       #3155-004

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Collateral Agent holds
a first-priority security interest in the Collateral.

                                       3
<PAGE>

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Collateral Agent and the special purpose entities for which
the Collateral Agent holds collateral, from and against any claims, loss or
damage of any kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new

                                       4
<PAGE>

                                                                       #3155-004

remedies provisions) that would be more onerous to the Company, or adversely
impact or affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving
effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period minus cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                              LEVERAGE RATIO                     PERIOD
                              --------------                     ------

                                4.50:1.0                 04/30/05 -   10/30/05
                                4.30:1.0                 10/31/05 -   10/30/06
                                4.00:1.0                 10/31/06 -   10/30/07
                                3.80:1.0                 10/31/07 -   10/30/08

                                       5
<PAGE>

                                                                       #3155-004

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations owing to GECC, DVI and USBPS; all as
determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Collateral Agent to enter
this Agreement, the Guarantor hereby affirms and restates its Guarantee as
related to this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Collateral Agent that all necessary actions on the part of
Radnet to be taken in connection

                                       6
<PAGE>

                                                                       #3155-004

with the execution, delivery and performance of this Agreement have been taken;
the performance by Radnet of this Agreement and the AMENDED AND RESTATED RIDER A
will not violate any of Radnet's Articles of Incorporation, Articles of
Formation, Partnership Agreement or other agreement or law by which Radnet is
bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                           U.S. Bank Portfolio Services
                           1310 Madrid Street, Suite 103
                           Marshall, MN 56258
                           Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                                       7
<PAGE>

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE COLLATERAL AGENT, (A) AGREE TO
SUBMIT FOR THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS
AGREEMENT AND ANY SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN
RESPECT HEREOF OR THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE
COMONWEALTH OF PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE
EASTERN DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B)
CONSENT THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE
ANY OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH
ACTION OR PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY
SUCH ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY
SUBSTANTIALLY SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY
AT ITS ADDRESS AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE
COMPLETED UPON THE EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME
SHALL HAVE BEEN POSTED AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY
EXHIBIT OR SCHEDULE SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY
OTHER MANNER PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH

                                       8
<PAGE>

                                                                       #3155-004

HEREBY UNCONDITIONALLY WAIVES ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF
ACTION BASED UPON OR ARISING OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY
EXHIBIT AND THE TRANSACTIONS CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED
DOCUMENTS, ANY DEALINGS BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT
MATTER HEREOF OR THEREOF, AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED
BETWEEN USBPS AS AGENT FOR THE TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY
IN ITS DISCRETION ENFORCE THE TERMS OF THE FORUM SELECTION PROVISIONS IN THE
LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Collateral Agent, and the Noteholders from and against any claim,
loss, or damage arising out of the negotiation execution, and performance of the
Loan or related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #3155-004

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUB-SERVICER
                                    FOR DVI FUNDING, L.L.C. AND AS AGENT
                                    FOR U.S. BANK, N.A., AS COLLATERAL AGENT

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:_____________________________________

                                       10
<PAGE>

                                                                       #3155-003

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Sub-Servicer for DVI Funding, L.L.C. and as Agent for
U.S. Bank, N.A., as Collateral Agent, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about July 11, 2001, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3155-003 dated July 31,
2001 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about July 11, 2001 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Funding, L.L.C. ("DVI FUNDING") and
thereafter pursuant to an Amended and Restated Indenture, DVI Funding granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Collateral Agent, for the

<PAGE>

                                                                       #3155-003

benefit of a noteholder which purchased asset backed promissory notes issued by
DVI Funding (the "Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the
Collateral Agent in the sum set forth on AMENDED AND RESTATED RIDER A annexed
hereto, and has no defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Collateral Agent will modify the
Loan to provide for payments to commence in accordance with the attached revised
payment schedule (the

                                       2
<PAGE>

                                                                       #3155-003

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Collateral Agent holds
a first-priority security interest in the Collateral.

                                       3
<PAGE>

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Collateral Agent and the special purpose entities for which
the Collateral Agent holds collateral, from and against any claims, loss or
damage of any kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new

                                       4
<PAGE>

                                                                       #3155-003

remedies provisions) that would be more onerous to the Company, or adversely
impact or affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving
effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period minus cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                              LEVERAGE RATIO                    PERIOD
                              --------------                    ------

                                4.50:1.0                 04/30/05 -   10/30/05
                                4.30:1.0                 10/31/05 -   10/30/06
                                4.00:1.0                 10/31/06 -   10/30/07
                                3.80:1.0                 10/31/07 -   10/30/08

                                       5
<PAGE>

                                                                       #3155-003

                       "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations owing to GECC, DVI and USBPS; all as
determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Collateral Agent to enter
this Agreement, the Guarantor hereby affirms and restates its Guarantee as
related to this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Collateral Agent that all necessary actions on the part of
Radnet to be taken in connection

                                       6
<PAGE>

                                                                       #3155-003

with the execution, delivery and performance of this Agreement have been taken;
the performance by Radnet of this Agreement and the AMENDED AND RESTATED RIDER A
will not violate any of Radnet's Articles of Incorporation, Articles of
Formation, Partnership Agreement or other agreement or law by which Radnet is
bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                           U.S. Bank Portfolio Services
                           1310 Madrid Street, Suite 103
                           Marshall, MN 56258
                           Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                                       7
<PAGE>

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE COLLATERAL AGENT, (A) AGREE TO
SUBMIT FOR THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS
AGREEMENT AND ANY SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN
RESPECT HEREOF OR THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE
COMONWEALTH OF PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE
EASTERN DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B)
CONSENT THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE
ANY OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH
ACTION OR PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY
SUCH ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY
SUBSTANTIALLY SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY
AT ITS ADDRESS AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE
COMPLETED UPON THE EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME
SHALL HAVE BEEN POSTED AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY
EXHIBIT OR SCHEDULE SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY
OTHER MANNER PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH

                                       8
<PAGE>

                                                                       #3155-003

HEREBY UNCONDITIONALLY WAIVES ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF
ACTION BASED UPON OR ARISING OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY
EXHIBIT AND THE TRANSACTIONS CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED
DOCUMENTS, ANY DEALINGS BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT
MATTER HEREOF OR THEREOF, AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED
BETWEEN USBPS AS AGENT FOR THE TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY
IN ITS DISCRETION ENFORCE THE TERMS OF THE FORUM SELECTION PROVISIONS IN THE
LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Collateral Agent, and the Noteholders from and against any claim,
loss, or damage arising out of the negotiation execution, and performance of the
Loan or related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #3155-003

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUB-SERVICER
                                    FOR DVI FUNDING, L.L.C. AND AS AGENT FOR
                                    U.S. BANK, N.A., AS COLLATERAL AGENT

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:_____________________________________

                                       10
<PAGE>

                                                                       #3155-001

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVIII, L.L.C. and
as Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street,
Suite 103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about July 11, 2001, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3155-001 dated July 11,
2001 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about July 11, 2001 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVIII, L.L.C. ("DVI
XVIII") and thereafter pursuant to an Amended and Restated Indenture, DVI XVIII
granted a first priority security interest in and pledged all of the Loan
Documents in favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #3155-001

noteholder which purchased asset backed promissory notes issued by DVI XVIII
(the "Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #3155-001

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #3155-001

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #3155-001

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                              LEVERAGE RATIO                    PERIOD
                              --------------                    ------

                                4.50:1.0                 04/30/05 -   10/30/05
                                4.30:1.0                 10/31/05 -   10/30/06
                                4.00:1.0                 10/31/06 -   10/30/07
                                3.80:1.0                 10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #3155-001

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #3155-001

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                           U.S. Bank Portfolio Services
                           1310 Madrid Street, Suite 103
                           Marshall, MN 56258
                           Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #3155-001

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #3155-001

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #3155-001

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XVIII, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:_____________________________________

                                       10
<PAGE>

                                                                       #2839-002

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVIII, L.L.C. and
as Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street,
Suite 103, Marshall, Minnesota 56258 ("USBPS") and SoCal MR Site Management,
Inc., a corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("SOCAL"), and such other signatories hereto.

                  WHEREAS, on or about October 27, 2000, SoCal executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Amended and Restated Secured Promissory Note Number
#2839-002 dated July 2, 2002 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of SoCal to DVI (collectively the "OBLIGATIONS"), SoCal, pursuant to
a Master Security Agreement dated on or about October 27, 2000 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of SoCal to DVI, SoCal delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVIII, L.L.C. ("DVI
XVIII") and thereafter pursuant to an Amended and Restated Indenture, DVI XVIII
granted a first priority security interest in and pledged all of the Loan
Documents in favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #2839-002

noteholder which purchased asset backed promissory notes issued by DVI XVIII
(the "Noteholder");

                  WHEREAS, DVI contributed other Loans with SoCal or certain
affiliates of SoCal to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, SoCal is in default under the terms of the Loan;

                  WHEREAS, SoCal has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, SoCal and/or certain of its affiliates have agreed to
modify the Related Loans;

                  WHEREAS, SoCal and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. SoCal acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #2839-002

"AMENDED AND RESTATED RIDER A"). SoCal may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by SoCal and the satisfaction of
each of the following conditions:

                           (a) SoCal and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) SoCal and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the SoCal Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. SoCal hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #2839-002

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. SoCal hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #2839-002

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                              LEVERAGE RATIO                    PERIOD
                              --------------                    ------

                                4.50:1.0                 04/30/05 -   10/30/05
                                4.30:1.0                 10/31/05 -   10/30/06
                                4.00:1.0                 10/31/06 -   10/30/07
                                3.80:1.0                 10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #2839-002

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. SoCal, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. SoCal represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of SoCal to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by SoCal of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of SoCal's

                                       6
<PAGE>

#2839-002 Articles of Incorporation, Articles of Formation, Partnership
Agreement or other agreement or law by which SoCal is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                           U.S. Bank Portfolio Services
                           1310 Madrid Street, Suite 103
                           Marshall, MN 56258
                           Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #2839-002

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #2839-002

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. SoCal, the Company and the Guarantor hereby release USBPS,
the Trustee, and the Noteholders from and against any claim, loss, or damage
arising out of the negotiation execution, and performance of the Loan or related
matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #2839-002

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XVIII, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:_____________________________________

                                       10
<PAGE>

                                                                       #1231-050

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Servicer for DVI Receivables XV, L.L.C. and as Agent for
U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite 103,
Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a corporation,
with offices at 1516 Cotner Avenue, Los Angeles, CA 90025 ("RADNET"), and such
other signatories hereto.

                  WHEREAS, on or about March 16, 1996, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Loan and Security Agreement
collectively with the Schedule Number #1231-050 dated May 31, 2001 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Security Agreement dated on or about December 15, 1997 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XV, L.L.C. ("DVI XV")
and thereafter pursuant to an Amended and Restated Indenture, DVI XV granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #1231-050

noteholder which purchased asset backed promissory notes issued by DVI XV (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #1231-050

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #1231-050

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #1231-050

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period minus cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                              LEVERAGE RATIO                    PERIOD
                              --------------                    ------

                                4.50:1.0                 04/30/05 -   10/30/05
                                4.30:1.0                 10/31/05 -   10/30/06
                                4.00:1.0                 10/31/06 -   10/30/07
                                3.80:1.0                 10/31/07 -   10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #1231-050

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #1231-050

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                           U.S. Bank Portfolio Services
                           1310 Madrid Street, Suite 103
                           Marshall, MN 56258
                           Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #1231-050

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #1231-050

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #1231-050

                                    LYON FINANCIAL  SERVICES,  INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SERVICER
                                    FOR DVI RECEIVABLES XV, L.L.C.  AND AS AGENT
                                    FOR U.S. BANK, N.A., AS TRUSTEE

                                    By:_________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By:_________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:_____________________________________

                                       10

<PAGE>

                                                                       #1231-049

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Servicer for DVI Receivables XV, L.L.C. and as Agent for
U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite 103,
Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a corporation,
with offices at 1516 Cotner Avenue, Los Angeles, CA 90025 ("RADNET"), and such
other signatories hereto.

                  WHEREAS, on or about March 16, 1996, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Loan and Security Agreement
collectively with the Schedule Number #1231-049 dated April 25, 2001 (the
"LOAN");
                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Security Agreement dated on or about December 15, 1997 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");
                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XV, L.L.C. ("DVI XV")
and thereafter pursuant to an Amended and Restated Indenture, DVI XV granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #1231-049

noteholder which purchased asset backed promissory notes issued by DVI XV (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #1231-049

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #1231-049

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #1231-049

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIODRu
                                 --------------          --------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #1231-049

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #1231-049

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #1231-049

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #1231-049

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #1231-049

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SERVICER
                                    FOR DVI RECEIVABLES XV, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By: ____________________________________

                                       10
<PAGE>

                                                                       #1231-048

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XIX, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about March 16, 1996, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Loan and Security Agreement
collectively with the Schedule Number #1231-048 dated April 25, 2001 (the
"LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Security Agreement dated on or about December 15, 1997 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XIX, L.L.C. ("DVI XIX")
and thereafter pursuant to an Amended and Restated Indenture, DVI XIX granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #1231-048

noteholder which purchased asset backed promissory notes issued by DVI XIX (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #1231-048

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #1231-048

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #1231-048

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period minus cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIOD
                                 --------------          ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #1231-048

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #1231-048

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #1231-048

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #1231-048

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #1231-048

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XIX, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By: ____________________________________

                                       10
<PAGE>

                                                                       #1231-047

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XIX, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about March 16, 1996, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Loan and Security Agreement
collectively with the Schedule Number #1231-047 dated April 14, 2001 (the
"LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Security Agreement dated on or about December 15, 1997 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XIX, L.L.C. ("DVI XIX")
and thereafter pursuant to an Amended and Restated Indenture, DVI XIX granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #1231-047

noteholder which purchased asset backed promissory notes issued by DVI XIX (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #1231-047

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #1231-047

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #1231-047

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIOD
                                 --------------          ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #1231-047

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #1231-047

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #1231-047

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #1231-047

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #1231-047

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XIX, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:
Primedex Health Systems, Inc., Guarantor

By: ____________________________________

                                       10
<PAGE>

                                                                       #1231-046

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XIV, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about March 16, 1996, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Loan and Security Agreement
collectively with the Schedule Number #1231-046 dated September 27, 2000 (the
"LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Security Agreement dated on or about December 15, 1997 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XIV, L.L.C. ("DVI XIV")
and thereafter pursuant to an Amended and Restated Indenture, DVI XIV granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #1231-046

noteholder which purchased asset backed promissory notes issued by DVI XIV (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #1231-046

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #1231-046

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #1231-046

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                LEVERAGE RATIO         PERIOD
                                --------------         ------

                                   4.50:1.0      04/30/05 - 10/30/05
                                   4.30:1.0      10/31/05 - 10/30/06
                                   4.00:1.0      10/31/06 - 10/30/07
                                   3.80:1.0      10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #1231-046

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #1231-046

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                           U.S. Bank Portfolio Services
                           1310 Madrid Street, Suite 103
                           Marshall, MN 56258
                           Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #1231-046

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #1231-046

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #1231-046

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XIV, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By: ____________________________________

                                       10
<PAGE>

                                                                       #1231-045

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XIV, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about March 16, 1996, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Loan and Security Agreement
collectively with the Schedule Number #1231-045 dated September 21, 2000 (the
"LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Security Agreement dated on or about December 15, 1997 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XIV, L.L.C. ("DVI XIV")
and thereafter pursuant to an Amended and Restated Indenture, DVI XIV granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #1231-045

noteholder which purchased asset backed promissory notes issued by DVI XIV (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>
                                                                       #1231-045

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>
                                                                       #1231-045

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #1231-045

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period minus cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIOD
                                 --------------          ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #1231-045

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #1231-045

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #1231-045

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #1231-045

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #1231-045

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XIV, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By: ____________________________________

                                       10
<PAGE>

                                                                       #1231-044

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XII, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about March 16, 1996, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Loan and Security Agreement
collectively with the Schedule Number #1231-044 dated March 31, 2000 (the
"LOAN");
                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Security Agreement dated on or about December 15, 1997 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");
                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XII, L.L.C. ("DVI XII")
and thereafter pursuant to an Amended and Restated Indenture, DVI XII granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #1231-044

noteholder which purchased asset backed promissory notes issued by DVI XII (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #1231-044

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #1231-044

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #1231-044

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period minus cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIOD
                                 --------------          ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #1231-044

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #1231-044

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #1231-044

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #1231-044

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #1231-044

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XII, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By: ____________________________________

                                       10
<PAGE>

                                                                       #1231-043

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XII, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about March 16, 1996, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Loan and Security Agreement
collectively with the Schedule Number #1231-043 dated March 31, 2000 (the
"LOAN");
                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Security Agreement dated on or about December 15, 1997 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XII, L.L.C. ("DVI XII")
and thereafter pursuant to an Amended and Restated Indenture, DVI XII granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #1231-043

noteholder which purchased asset backed promissory notes issued by DVI XII (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #1231-043

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                   6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #1231-043

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #1231-043

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period minus cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIOD
                                 --------------          ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #1231-043

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #1231-043

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #1231-043

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #1231-043

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #1231-043

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XII, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By: ____________________________________

                                       10
<PAGE>

                                                                       #1231-042

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XII, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about March 16, 1996, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Loan and Security Agreement
collectively with the Schedule Number #1231-042 dated March 31, 2000 (the
"LOAN");
                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Security Agreement dated on or about December 15, 1997 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;
                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");
                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XII, L.L.C. ("DVI XII")
and thereafter pursuant to an Amended and Restated Indenture, DVI XII granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #1231-042

noteholder which purchased asset backed promissory notes issued by DVI XII (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #1231-042

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                                    (c) Such other documents, including UCC
                           financing statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #1231-042

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #1231-042

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO       PERIOD
                                 --------------       ------

                                    4.50:1.0    04/30/05 - 10/30/05
                                    4.30:1.0    10/31/05 - 10/30/06
                                    4.00:1.0    10/31/06 - 10/30/07
                                    3.80:1.0    10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #1231-042

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #1231-042

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #1231-042

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #1231-042

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #1231-042

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XII, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By: ____________________________________

                                       10
<PAGE>

                                                                       #1231-041

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables VIII, L.L.C. and
as Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street,
Suite 103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about March 16, 1996, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Loan and Security Agreement
collectively with the Schedule Number #1231-041 dated December 27, 1999 (the
"LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Security Agreement dated on or about December 15, 1997 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables VIII, L.L.C. ("DVI
VIII") and thereafter pursuant to an Amended and Restated Indenture, DVI VIII
granted a first priority security interest in and pledged all of the Loan
Documents in favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #1231-041

noteholder which purchased asset backed promissory notes issued by DVI VIII (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #1231-041

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #1231-041

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #1231-041

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period minus cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIOD
                                 --------------          ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #1231-041

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #1231-041

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #1231-041

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #1231-041

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #1231-041

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES VIII, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By: ____________________________________

                                       10
<PAGE>

                                                                       #1231-040

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XII, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about March 16, 1996, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Loan and Security Agreement
collectively with the Schedule Number #1231-040 dated December 20, 1999 (the
"LOAN");
                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Security Agreement dated on or about December 15, 1997 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");
                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XII, L.L.C. ("DVI XII")
and thereafter pursuant to an Amended and Restated Indenture, DVI XII granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #1231-040

noteholder which purchased asset backed promissory notes issued by DVI XII (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #1231-040

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #1231-040

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #1231-040

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIOD
                                 --------------          ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #1231-040

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #1231-040

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #1231-040

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #1231-040

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #1231-040

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XII, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By: ____________________________________

                                       10
<PAGE>

                                                                       #1231-037

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XII, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about March 16, 1996, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Loan and Security Agreement
collectively with the Schedule Number #1231-037 dated December 20, 1999 (the
"LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Security Agreement dated on or about December 15, 1997 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XII, L.L.C. ("DVI XII")
and thereafter pursuant to an Amended and Restated Indenture, DVI XII granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #1231-037

noteholder which purchased asset backed promissory notes issued by DVI XII (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #1231-037

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #1231-037

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #1231-037

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIOD
                                 --------------          ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #1231-037

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #1231-037

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #1231-037

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #1231-037

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #1231-037

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XII, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By: ____________________________________

                                       10
<PAGE>

                                                                       #1231-035

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XI, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about March 16, 1996, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Loan and Security Agreement
collectively with the Schedule Number #1231-035 dated September 28, 1999 (the
"LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Security Agreement dated on or about December 15, 1997 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");
                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XI, L.L.C. ("DVI XI")
and thereafter pursuant to an Amended and Restated Indenture, DVI XI granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #1231-035

noteholder which purchased asset backed promissory notes issued by DVI XI (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #1231-035

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #1231-035

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #1231-035

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period minus cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIOD
                                 --------------          ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #1231-035

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #1231-035

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #1231-035

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #1231-035

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #1231-035

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XI, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By: ____________________________________

                                       10
<PAGE>

                                                                       #1231-034

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XI, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about March 16, 1996, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Loan and Security Agreement
collectively with the Schedule Number #1231-034 dated June 28, 1999 (the
"LOAN");
                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Security Agreement dated on or about December 15, 1997 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XI, L.L.C. ("DVI XI")
and thereafter pursuant to an Amended and Restated Indenture, DVI XI granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #1231-034

noteholder which purchased asset backed promissory notes issued by DVI XI (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #1231-034

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #1231-034

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #1231-034

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period minus cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIOD
                                 --------------          ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #1231-034

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #1231-034

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #1231-034

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #1231-034

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #1231-034

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XI, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By: ____________________________________

                                       10
<PAGE>

                                                                       #1231-032

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables VIII, L.L.C. and
as Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street,
Suite 103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("RADNET"), and such other signatories hereto.

                  WHEREAS, on or about March 16, 1996, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Loan and Security Agreement
collectively with the Schedule Number #1231-032 dated August 31, 1998 (the
"LOAN");
                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Security Agreement dated on or about December 15, 1997 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables VIII, L.L.C. ("DVI
VIII") and thereafter pursuant to an Amended and Restated Indenture, DVI VIII
granted a first priority security interest in and pledged all of the Loan
Documents in favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #1231-032

noteholder which purchased asset backed promissory notes issued by DVI VIII (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #1231-032

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #1231-032

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #1231-032

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIOD
                                 --------------          ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #1231-032

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #1231-032

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #1231-032

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #1231-032

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #1231-032

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES VIII, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By: ____________________________________

                                       10
<PAGE>

                                                                       #3024-003

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables X, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management II, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025 ("RADNET
II"), and such other signatories hereto.

                  WHEREAS, on or about May 3, 2001, Radnet II executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3024-003 dated May 3, 2001
(the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet II to DVI (collectively the "OBLIGATIONS"), Radnet II,
pursuant to a Master Security Agreement dated on or about May 3, 2001 (the
"SECURITY AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet II to DVI, Radnet II delivered to DVI the guarantee (the
"GUARANTEE") of Radnet Management I, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables X, L.L.C. ("DVI X") and
thereafter pursuant to an Amended and Restated Indenture, DVI X granted a first
priority security interest in and pledged all of the Loan Documents in favor of
U.S. Bank, N.A., as Trustee, for the benefit of a noteholder which purchased
asset backed promissory notes issued by DVI X (the "Noteholder");

<PAGE>

                                                                       #3024-003

                  WHEREAS, DVI contributed other Loans with Radnet II or certain
affiliates of Radnet II to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet II is in default under the terms of the Loan;

                  WHEREAS, Radnet II has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet II and/or certain of its affiliates have
agreed to modify the Related Loans;

                  WHEREAS, Radnet II and certain of its affiliates are engaged
in negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet II acknowledges that it is duly indebted to the
Trustee in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and
has no defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). Radnet II may, at any time,
prepay all of the then

                                       2
<PAGE>

                                                                       #3024-003

outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet II and the satisfaction of
each of the following conditions:

                           (a) Radnet II and/or its affiliates shall have
                  entered into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet II and/or its affiliates shall have
                  entered into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet II Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet II hereby acknowledges and agrees that it has no,
and will not assert any, defenses, counterclaims or offsets to the Loan and
AMENDED AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds
a first-priority security interest in the Collateral.

                                       3
<PAGE>

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                  8. Radnet II hereby releases the Noteholder, USBPS
individually and as agent for the Trustee and the special purpose entities for
which the Trustee holds collateral, from and against any claims, loss or damage
of any kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                                       4
<PAGE>

                                                                       #3024-003

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving
effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIOD
                                 --------------          ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means,

                                       5
<PAGE>

                                                                       #3024-003

as of any date of determination, without duplication, the sum of (a) the
outstanding aggregate amount of the obligations for borrowed money, (b) the
outstanding principal amount of capital leases, (c) the outstanding principal
amount of purchase money indebtedness, (d) the outstanding principal amount of
funded debt, and (e) the outstanding principal amount of all obligations owing
to GECC, DVI and USBPS; all as determined for the Company and its subsidiaries
on a consolidated basis without duplication and in accordance with generally
accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet II, the Company and the Guarantor each represent
and warrant that each has been represented by an attorney of its choice and is
fully aware of the terms contained in this Agreement and AMENDED AND RESTATED
RIDER A to which it is a party which was voluntarily entered into without
coercion or duress of any kind.

                  12. Radnet II represents and warrants to USBPS on behalf of
the Noteholders and Trustee that all necessary actions on the part of Radnet II
to be taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by

                                       6
<PAGE>

                                                                       #3024-003

Radnet II of this Agreement and the AMENDED AND RESTATED RIDER A will not
violate any of Radnet II's Articles of Incorporation, Articles of Formation,
Partnership Agreement or other agreement or law by which Radnet II is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #3024-003

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #3024-003

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet II, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #3024-003

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES X, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET MANAGEMENT II, INC.

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Radnet Management I, Inc., Guarantor

By: _________________________________

                                       10
<PAGE>

                                                                       #3024-002

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVII, L.L.C. and
as Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street,
Suite 103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management II, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025 ("RADNET
II"), and such other signatories hereto.

                  WHEREAS, on or about May 3, 2001, Radnet II executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3024-002 dated May 3, 2001
(the "LOAN");
                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet II to DVI (collectively the "OBLIGATIONS"), Radnet II,
pursuant to a Master Security Agreement dated on or about May 3, 2001 (the
"SECURITY AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet II to DVI, Radnet II delivered to DVI the guarantee (the
"GUARANTEE") of Radnet Management I, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVII, L.L.C. ("DVI
XVII") and thereafter pursuant to an Amended and Restated Indenture, DVI XVII
granted a first priority security interest in and pledged all of the Loan
Documents in favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #3024-002

noteholder which purchased asset backed promissory notes issued by DVI XVII (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet II or certain
affiliates of Radnet II to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet II is in default under the terms of the Loan;

                  WHEREAS, Radnet II has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet II and/or certain of its affiliates have
agreed to modify the Related Loans;

                  WHEREAS, Radnet II and certain of its affiliates are engaged
in negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet II acknowledges that it is duly indebted to the
Trustee in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and
has no defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #3024-002

"AMENDED AND RESTATED RIDER A"). Radnet II may, at any time, prepay all of the
then outstanding Obligations subject to an additional prepayment fee of 2% of
such Obligations. Partial prepayments of the Obligations shall not be permitted
at any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet II and the satisfaction of
each of the following conditions:

                           (a) Radnet II and/or its affiliates shall have
                  entered into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet II and/or its affiliates shall have
                  entered into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet II Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet II hereby acknowledges and agrees that it has no,
and will not assert any, defenses, counterclaims or offsets to the Loan and
AMENDED AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds
a first-priority security interest in the Collateral.

                                       3
<PAGE>

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                  8. Radnet II hereby releases the Noteholder, USBPS
individually and as agent for the Trustee and the special purpose entities for
which the Trustee holds collateral, from and against any claims, loss or damage
of any kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                                       4
<PAGE>

                                                                       #3024-002

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving
effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIOD
                                 --------------          ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means,

                                       5
<PAGE>

                                                                       #3024-002

as of any date of determination, without duplication, the sum of (a) the
outstanding aggregate amount of the obligations for borrowed money, (b) the
outstanding principal amount of capital leases, (c) the outstanding principal
amount of purchase money indebtedness, (d) the outstanding principal amount of
funded debt, and (e) the outstanding principal amount of all obligations owing
to GECC, DVI and USBPS; all as determined for the Company and its subsidiaries
on a consolidated basis without duplication and in accordance with generally
accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet II, the Company and the Guarantor each represent
and warrant that each has been represented by an attorney of its choice and is
fully aware of the terms contained in this Agreement and AMENDED AND RESTATED
RIDER A to which it is a party which was voluntarily entered into without
coercion or duress of any kind.

                  12. Radnet II represents and warrants to USBPS on behalf of
the Noteholders and Trustee that all necessary actions on the part of Radnet II
to be taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by

                                       6
<PAGE>

                                                                       #3024-002

Radnet II of this Agreement and the AMENDED AND RESTATED RIDER A will not
violate any of Radnet II's Articles of Incorporation, Articles of Formation,
Partnership Agreement or other agreement or law by which Radnet II is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #3024-002

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #3024-002

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet II, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #3024-002

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XVII, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET MANAGEMENT II, INC.

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Radnet Management I, Inc., Guarantor

By: ________________________________

                                       10
<PAGE>

                                                                       #3024-001

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVII, L.L.C. and
as Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street,
Suite 103, Marshall, Minnesota 56258 ("USBPS") and Radnet Management II, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025 ("RADNET
II"), and such other signatories hereto.

                  WHEREAS, on or about May 3, 2001, Radnet II executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3024-001 dated May 3, 2001
(the "LOAN");
                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet II to DVI (collectively the "OBLIGATIONS"), Radnet II,
pursuant to a Master Security Agreement dated on or about May 3, 2001 (the
"SECURITY AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet II to DVI, Radnet II delivered to DVI the guarantee (the
"GUARANTEE") of Radnet Management I, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVII, L.L.C. ("DVI
XVII") and thereafter pursuant to an Amended and Restated Indenture, DVI XVII
granted a first priority security interest in and pledged all of the Loan
Documents in favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #3024-001

noteholder which purchased asset backed promissory notes issued by DVI XVII (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet II or certain
affiliates of Radnet II to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet II is in default under the terms of the Loan;

                  WHEREAS, Radnet II has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet II and/or certain of its affiliates have
agreed to modify the Related Loans;

                  WHEREAS, Radnet II and certain of its affiliates are engaged
in negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet II acknowledges that it is duly indebted to the
Trustee in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and
has no defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #3024-001

"AMENDED AND RESTATED RIDER A"). Radnet II may, at any time, prepay all of the
then outstanding Obligations subject to an additional prepayment fee of 2% of
such Obligations. Partial prepayments of the Obligations shall not be permitted
at any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet II and the satisfaction of
each of the following conditions:

                           (a) Radnet II and/or its affiliates shall have
                  entered into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet II and/or its affiliates shall have
                  entered into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet II Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet II hereby acknowledges and agrees that it has no,
and will not assert any, defenses, counterclaims or offsets to the Loan and
AMENDED AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds
a first-priority security interest in the Collateral.

                                       3
<PAGE>

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                  8. Radnet II hereby releases the Noteholder, USBPS
individually and as agent for the Trustee and the special purpose entities for
which the Trustee holds collateral, from and against any claims, loss or damage
of any kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                                       4
<PAGE>

                                                                       #3024-001

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving
effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and related reasonable
and customary expenses incurred by employees of Parent) in an aggregate amount
not to exceed $750,000 in any fiscal year, (2) in amounts necessary to enable
Parent to pay taxes when due and owing by it in the ordinary course of its
business as a holding company and (3) in amounts necessary to enable Parent to
pay interest on those certain 11.5% Series A Convertible Subordinated Notes due
June 30, 2008, issued by Parent on June 25, 1993, and (b) Parent may make
Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period minus cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIOD
                                 --------------          ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means,

                                       5
<PAGE>

                                                                       #3024-001

as of any date of determination, without duplication, the sum of (a) the
outstanding aggregate amount of the obligations for borrowed money, (b) the
outstanding principal amount of capital leases, (c) the outstanding principal
amount of purchase money indebtedness, (d) the outstanding principal amount of
funded debt, and (e) the outstanding principal amount of all obligations owing
to GECC, DVI and USBPS; all as determined for the Company and its subsidiaries
on a consolidated basis without duplication and in accordance with generally
accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet II, the Company and the Guarantor each represent
and warrant that each has been represented by an attorney of its choice and is
fully aware of the terms contained in this Agreement and AMENDED AND RESTATED
RIDER A to which it is a party which was voluntarily entered into without
coercion or duress of any kind.

                  12. Radnet II represents and warrants to USBPS on behalf of
the Noteholders and Trustee that all necessary actions on the part of Radnet II
to be taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by

                                       6
<PAGE>

                                                                       #3024-001

Radnet II of this Agreement and the AMENDED AND RESTATED RIDER A will not
violate any of Radnet II's Articles of Incorporation, Articles of Formation,
Partnership Agreement or other agreement or law by which Radnet II is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #3024-001

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #3024-001

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet II, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #3024-001

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XVII, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET MANAGEMENT II, INC.

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Radnet Management I, Inc., Guarantor

By: _________________________________

                                       10
<PAGE>

                                                                       #2661-004

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XII, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and SoCal MR Site Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("SOCAL"), and such other signatories hereto.

                  WHEREAS, on or about June 5, 2000, SoCal executed and
delivered to DVI Financial Services Inc. ("DVI") a Term Loan Agreement
collectively with the Secured Promissory Note Number #2661-004 dated June 5,
2000 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of SoCal to DVI (collectively the "OBLIGATIONS"), SoCal, pursuant to
a Security Agreement dated on or about June 5, 2000 (the "SECURITY AGREEMENT"),
granted DVI a first priority security interest in certain Collateral described
therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of SoCal to DVI, SoCal delivered to DVI the guarantee (the
"GUARANTEE") of Radnet Management, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XII, L.L.C. ("DVI XII")
and thereafter pursuant to an Amended and Restated Indenture, DVI XII granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #2661-004

noteholder which purchased asset backed promissory notes issued by DVI XII (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with SoCal or certain
affiliates of SoCal to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, SoCal is in default under the terms of the Loan;

                  WHEREAS, SoCal has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, SoCal and/or certain of its affiliates have agreed to
modify the Related Loans;

                  WHEREAS, SoCal and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. SoCal acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #2661-004

"AMENDED AND RESTATED RIDER A"). SoCal may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                     4. This Agreement shall become effective upon the date that
USBPS receives this Agreement
duly executed by SoCal and the satisfaction of each of the following conditions:

                           (a) SoCal and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) SoCal and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the SoCal Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. SoCal hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #2661-004

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. SoCal hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #2661-004

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                LEVERAGE RATIO           PERIOD
                                --------------           ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #2661-004

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. SoCal, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. SoCal represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of SoCal to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by SoCal of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of SoCal's

                                       6
<PAGE>

                                                                       #2661-004

Articles of Incorporation, Articles of Formation, Partnership Agreement or other
agreement or law by which SoCal is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                           Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #2661-004

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #2661-004

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. SoCal, the Company and the Guarantor hereby release USBPS,
the Trustee, and the Noteholders from and against any claim, loss, or damage
arising out of the negotiation execution, and performance of the Loan or related
matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #2661-004

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XII, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    SOCAL MR SITE MANAGEMENT, INC.

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Radnet Management, Inc., Guarantor

By: ______________________________

                                       10
<PAGE>

                                                                       #2661-003

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XIV, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and SoCal MR Site Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("SOCAL"), and such other signatories hereto.

                  WHEREAS, on or about June 5, 2000, SoCal executed and
delivered to DVI Financial Services Inc. ("DVI") a Term Loan Agreement
collectively with the Secured Promissory Note Number #2661-003 dated June 5,
2000 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of SoCal to DVI (collectively the "OBLIGATIONS"), SoCal, pursuant to
a Security Agreement dated on or about June 5, 2000 (the "SECURITY AGREEMENT"),
granted DVI a first priority security interest in certain Collateral described
therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of SoCal to DVI, SoCal delivered to DVI the guarantee (the
"GUARANTEE") of Radnet Management, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XIV, L.L.C. ("DVI XIV")
and thereafter pursuant to an Amended and Restated Indenture, DVI XIV granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #2661-003

noteholder which purchased asset backed promissory notes issued by DVI XIV (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with SoCal or certain
affiliates of SoCal to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, SoCal is in default under the terms of the Loan;

                  WHEREAS, SoCal has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, SoCal and/or certain of its affiliates have agreed to
modify the Related Loans;

                  WHEREAS, SoCal and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. SoCal acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #2661-003

"AMENDED AND RESTATED RIDER A"). SoCal may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by SoCal and the satisfaction of
each of the following conditions:

                           (a) SoCal and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) SoCal and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification. 5. The
                  closing of the restructuring of the SoCal Loan is further
                  subject to delivery to USBPS of all of the following, each in
                  form and substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. SoCal hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #2661-003

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. SoCal hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #2661-003

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIOD
                                 --------------          ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #2661-003

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. SoCal, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. SoCal represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of SoCal to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by SoCal of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of SoCal's

                                       6
<PAGE>

                                                                       #2661-003

Articles of Incorporation, Articles of Formation, Partnership Agreement or other
agreement or law by which SoCal is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #2661-003

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #2661-003

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. SoCal, the Company and the Guarantor hereby release USBPS,
the Trustee, and the Noteholders from and against any claim, loss, or damage
arising out of the negotiation execution, and performance of the Loan or related
matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #2661-003

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XIV, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    SOCAL MR SITE MANAGEMENT, INC.

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Radnet Management, Inc., Guarantor

By: _______________________________

                                       10
<PAGE>

                                                                       #2661-002

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XIV, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and SoCal MR Site Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("SOCAL"), and such other signatories hereto.

                  WHEREAS, on or about June 5, 2000, SoCal executed and
delivered to DVI Financial Services Inc. ("DVI") a Term Loan Agreement
collectively with the Secured Promissory Note Number #2661-002 dated June 5,
2000 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of SoCal to DVI (collectively the "OBLIGATIONS"), SoCal, pursuant to
a Security Agreement dated on or about June 5, 2000 (the "SECURITY AGREEMENT"),
granted DVI a first priority security interest in certain Collateral described
therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of SoCal to DVI, SoCal delivered to DVI the guarantee (the
"GUARANTEE") of Radnet Management, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XIV, L.L.C. ("DVI XIV")
and thereafter pursuant to an Amended and Restated Indenture, DVI XIV granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #2661-002

noteholder which purchased asset backed promissory notes issued by DVI XIV (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with SoCal or certain
affiliates of SoCal to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, SoCal is in default under the terms of the Loan;

                  WHEREAS, SoCal has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, SoCal and/or certain of its affiliates have agreed to
modify the Related Loans;

                  WHEREAS, SoCal and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. SoCal acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #2661-002

"AMENDED AND RESTATED RIDER A"). SoCal may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by SoCal and the satisfaction of
each of the following conditions:

                           (a) SoCal and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) SoCal and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the SoCal Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. SoCal hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #2661-002

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. SoCal hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #2661-002

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period minus cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIOD
                                 --------------          ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #2661-002

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. SoCal, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. SoCal represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of SoCal to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by SoCal of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of SoCal's

                                       6
<PAGE>

                                                                       #2661-002

Articles of Incorporation, Articles of Formation, Partnership Agreement or other
agreement or law by which SoCal is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #2661-002

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #2661-002

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. SoCal, the Company and the Guarantor hereby release USBPS,
the Trustee, and the Noteholders from and against any claim, loss, or damage
arising out of the negotiation execution, and performance of the Loan or related
matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #2661-002

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XIV, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    SOCAL MR SITE MANAGEMENT, INC.

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Radnet Management, Inc., Guarantor

By: ______________________________

                                       10
<PAGE>

                                                                       #2661-001

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XII, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and SoCal MR Site Management, Inc., a
corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("SOCAL"), and such other signatories hereto.

                  WHEREAS, on or about June 5, 2000, SoCal executed and
delivered to DVI Financial Services Inc. ("DVI") a Term Loan Agreement
collectively with the Secured Promissory Note Number #2661-001 dated June 5,
2000 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of SoCal to DVI (collectively the "OBLIGATIONS"), SoCal, pursuant to
a Security Agreement dated on or about June 5, 2000 (the "SECURITY AGREEMENT"),
granted DVI a first priority security interest in certain Collateral described
therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of SoCal to DVI, SoCal delivered to DVI the guarantee (the
"GUARANTEE") of Radnet Management, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XII, L.L.C. ("DVI XII")
and thereafter pursuant to an Amended and Restated Indenture, DVI XII granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #2661-001

noteholder which purchased asset backed promissory notes issued by DVI XII (the
"Noteholder");

                  WHEREAS, DVI contributed other Loans with SoCal or certain
affiliates of SoCal to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, SoCal is in default under the terms of the Loan;

                  WHEREAS, SoCal has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, SoCal and/or certain of its affiliates have agreed to
modify the Related Loans;

                  WHEREAS, SoCal and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. SoCal acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #2661-001

"AMENDED AND RESTATED RIDER A"). SoCal may, at any time, prepay all of the then
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by SoCal and the satisfaction of
each of the following conditions:

                           (a) SoCal and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) SoCal and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the SoCal Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. SoCal hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #2661-001

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. SoCal hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #2661-001

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period minus cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                 LEVERAGE RATIO          PERIOD
                                 --------------          ------

                                    4.50:1.0       04/30/05 - 10/30/05
                                    4.30:1.0       10/31/05 - 10/30/06
                                    4.00:1.0       10/31/06 - 10/30/07
                                    3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #2661-001

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. SoCal, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. SoCal represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of SoCal to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by SoCal of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of SoCal's

                                       6
<PAGE>

                                                                       #2661-001

Articles of Incorporation, Articles of Formation, Partnership Agreement or other
agreement or law by which SoCal is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #2661-001

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #2661-001

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. SoCal, the Company and the Guarantor hereby release USBPS,
the Trustee, and the Noteholders from and against any claim, loss, or damage
arising out of the negotiation execution, and performance of the Loan or related
matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #2661-001

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XII, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    SOCAL MR SITE MANAGEMENT, INC.

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Radnet Management, Inc., Guarantor

By: ______________________________

                                       10

<PAGE>

                                                                       #1232-010

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XIX, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Radnet Sub, Inc., a corporation,
with offices at 1516 Cotner Avenue, Los Angeles, CA 90025 ("RADNET"), and such
other signatories hereto.

                  WHEREAS, on or about March 17, 1996, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Loan and Security Agreement
collectively with the Schedule Number #1232-010 dated September 19, 2001 (the
"LOAN")(the Loan, together with all ancillary documents are, collectively, the
"LOAN DOCUMENTS");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Loan and Security Agreement dated on or about March 17, 1996 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XIX, L.L.C. ("DVI XIX")
and thereafter pursuant to an Amended and Restated Indenture, DVI XIX granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a noteholder which
purchased asset backed promissory notes issued by DVI XIX (the "Noteholder");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

<PAGE>

                                                                       #1232-010

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay
all of the outstanding Obligations subject to an additional prepayment fee of 2%
of such Obligations. Partial prepayments of the Obligations shall not be
permitted at any time.

                                       2
<PAGE>

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "Related Loan
                  Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                   5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                   6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                   7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a default under the Loan as modified by this
Agreement, and USBPS shall have all remedies thereunder.

                                       3
<PAGE>

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public;
and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no default
shall have occurred and be continuing immediately prior to or after giving
effect to any such payment, (a) the Company may make Distributions to Primedex
Health Systems, Inc., a New York corporation (the "PARENT") (1) in amounts
necessary to pay customary expenses of Parent in the ordinary course of its
business as a public holding company (including salaries and

                                       4
<PAGE>
                                                                       #1232-010

related reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                       LEVERAGE RATIO              PERIOD
                       --------------              ------

                          4.50:1.0           04/30/05 - 10/30/05
                          4.30:1.0           10/31/05 - 10/30/06
                          4.00:1.0           10/31/06 - 10/30/07
                          3.80:1.0           10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations owing to GECC, DVI and USBPS; all as
determined for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied.

                                       5
<PAGE>

                                                                       #1232-010

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. This paragraph is intentionally left blank.

                  11. Radnet and the Company each represent and warrant that it
has been represented by an attorney of its choice and is fully aware of the
terms contained in this Agreement and AMENDED AND RESTATED RIDER A to which it
is a party which was voluntarily entered into without coercion or duress of any
kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of Radnet's Articles of
Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                                       6
<PAGE>

                                                                       #1232-010

                          U.S. Bank Portfolio Services
                          1310 Madrid Street, Suite 103
                          Marshall, MN 56258
                          Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE BRMFS1 509512v2

                                       7
<PAGE>

                                                                       #1232-010

COMONWEALTH OF PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE
EASTERN DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B)
CONSENT THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE
ANY OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH
ACTION OR PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY
SUCH ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY
SUBSTANTIALLY SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY
AT ITS ADDRESS AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE
COMPLETED UPON THE EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME
SHALL HAVE BEEN POSTED AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY
EXHIBIT OR SCHEDULE SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY
OTHER MANNER PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY
UNCONDITIONALLY WAIVES ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION
BASED UPON OR ARISING OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY
EXHIBIT AND THE TRANSACTIONS CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED
DOCUMENTS, ANY DEALINGS BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT
MATTER HEREOF OR THEREOF, AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED
BETWEEN USBPS AS AGENT FOR THE TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY
IN ITS DISCRETION ENFORCE THE TERMS OF THE FORUM SELECTION PROVISIONS IN THE
LOANS.

                                       8
<PAGE>

                  20. Radnet and the Company hereby release USBPS, the Trustee,
and the Noteholders from and against any claim, loss, or damage arising out of
the negotiation execution, and performance of the Loan or related matters prior
to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XIX, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    RADNET SUB, INC.

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

                                       9
<PAGE>
                                                                       #0873-011

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVI, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Diagnostic Imaging Services, Inc.
I, a corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("DIS"), and such other signatories hereto.

                  WHEREAS, on or about March 30, 1995, DIS executed and
delivered to DVI Financial Services Inc. ("DVI") a Loan and Security Agreement
collectively with the Schedule Number #0873-011 dated November 27, 2000 (the
"LOAN")(the Loan, together with all ancillary documents are, collectively, the
"LOAN DOCUMENTS");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of DIS to DVI (collectively the "OBLIGATIONS"), DIS, pursuant to a
Loan and Security Agreement dated on or about March 30, 1995 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVI, L.L.C. ("DVI XVI")
and thereafter pursuant to an Amended and Restated Indenture, DVI XVI granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a noteholder which
purchased asset backed promissory notes issued by DVI XVI (the "Noteholder");

<PAGE>

                                                                       #0873-011

                  WHEREAS, DVI contributed other Loans with DIS or certain
affiliates of DIS to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, DIS is in default under the terms of the Loan;

                  WHEREAS, DIS has requested USBPS to modify the Loan to reflect
an adjustment in payments;

                  WHEREAS, DIS and/or certain of its affiliates have agreed to
modify the Related Loans;

                  WHEREAS, DIS and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. DIS acknowledges that it is duly indebted to the Trustee in
the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). DIS may, at any time, prepay all
of the outstanding

                                       2
<PAGE>

                                                                       #0873-011

Obligations subject to an additional prepayment fee of 2% of such Obligations.
Partial prepayments of the Obligations shall not be permitted at any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by DIS and the satisfaction of each
of the following conditions:

                           (a) DIS and/or its affiliates shall have entered into
                  agreements on similar terms to this Agreement and otherwise in
                  form and substance satisfactory to USBPS, relating to the
                  Related Loans (the "Related Loan Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) DIS and/or its affiliates shall have entered into
                  the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the DIS Loan is further
subject to delivery to USBPS of all of the following, each in form and substance
satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. DIS hereby acknowledges and agrees that it has no, and will
not assert any, defenses, counterclaims or offsets to the Loan and AMENDED AND
RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>
                                                                       #0873-011

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. DIS hereby releases the Noteholder, USBPS individually and
as agent for the Trustee and the special purpose entities for which the Trustee
holds collateral, from and against any claims, loss or damage of any kind or
nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #0873-011

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                       LEVERAGE RATIO               PERIOD
                       --------------               ------

                          4.50:1.0           04/30/05 - 10/30/05
                          4.30:1.0           10/31/05 - 10/30/06
                          4.00:1.0           10/31/06 - 10/30/07
                          3.80:1.0           10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #0873-011

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. This paragraph is intentionally left blank.

                  11. DIS and the Company each represent and warrant that it has
been represented by an attorney of its choice and is fully aware of the terms
contained in this Agreement and AMENDED AND RESTATED RIDER A to which it is a
party which was voluntarily entered into without coercion or duress of any kind.

                  12. DIS represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of DIS to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by DIS of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of DIS's Articles of
Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which DIS is bound.

                                       6
<PAGE>

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                           U.S. Bank Portfolio Services
                           1310 Madrid Street, Suite 103
                           Marshall, MN 56258
                           Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR

                                       7
<PAGE>

                                                                       #0873-011

PROCEEDING RELATING TO THIS AGREEMENT AND ANY SCHEDULE OR FOR RECOGNITION AND
ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR THEREOF, TO THE EXCLUSIVE
JURISDICTION OF THE COURTS OF THE COMONWEALTH OF PENNSYLVANIA, THE COURTS OF THE
UNITED STATES OF AMERICA FOR THE EASTERN DISTRICT OF PENNSYLVANIA, AND APPELLATE
COURTS FROM ANY THEREOF, (B) CONSENT THAT ANY ACTION OR PROCEEDING SHALL BE
BROUGHT IN SUCH COURTS, AND WAIVE ANY OBJECTION THAT EACH MAY NOW OR HEREAFTER
HAVE TO THE VENUE OF ANY SUCH ACTION OR PROCEEDING IN ANY SUCH COURT, (C) AGREE
THAT SERVICE OF PROCESS OF ANY SUCH ACTION OR PROCEEDING MAY BE EFFECTED BY
CERTIFIED MAIL (OR ANY SUBSTANTIALLY SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO
THE APPROPRIATE PARTY AT ITS ADDRESS AS SET FORTH HEREIN, AND SERVICE MADE SHALL
BE DEEMED TO BE COMPLETED UPON THE EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS
AFTER THE SAME SHALL HAVE BEEN POSTED AS AFORESAID, AND (D) AGREE THAT NOTHING
HEREIN OR IN ANY EXHIBIT OR SCHEDULE SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF
PROCESS IN ANY OTHER MANNER PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH
HEREBY UNCONDITIONALLY WAIVES ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF
ACTION BASED UPON OR ARISING OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY
EXHIBIT AND THE TRANSACTIONS CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED
DOCUMENTS, ANY DEALINGS BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT
MATTER HEREOF OR THEREOF, AND/OR THE RELATIONSHIP THAT IS BEING

                                       8
<PAGE>

                                                                       #0873-011

ESTABLISHED BETWEEN USBPS AS AGENT FOR THE TRUSTEE AND THE UNDERSIGNED, PROVIDED
USBPS MAY IN ITS DISCRETION ENFORCE THE TERMS OF THE FORUM SELECTION PROVISIONS
IN THE LOANS.

                  20. DIS and the Company hereby release USBPS, the Trustee, and
the Noteholders from and against any claim, loss, or damage arising out of the
negotiation execution, and performance of the Loan or related matters prior to
the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XVI, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    DIAGNOSTIC IMAGING SERVICES, INC. I

                                    By: ________________________________________

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

                                       9
<PAGE>

                                                                       #0873-007

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables VIII, L.L.C. and
as Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street,
Suite 103, Marshall, Minnesota 56258 ("USBPS") and Diagnostic Imaging Services,
Inc. I, a corporation, with offices at 1516 Cotner Avenue, Los Angeles, CA 90025
("DIS"), and such other signatories hereto.

                  WHEREAS, on or about March 30, 1995, DIS executed and
delivered to DVI Financial Services Inc. ("DVI") a Loan and Security Agreement
collectively with the Schedule Number #0873-007 dated August 31, 1998 (the
"LOAN")(the Loan, together with all ancillary documents are, collectively, the
"LOAN DOCUMENTS");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of DIS to DVI (collectively the "OBLIGATIONS"), DIS, pursuant to a
Loan and Security Agreement dated on or about March 30, 1995 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables VIII, L.L.C. ("DVI
VIII") and thereafter pursuant to an Amended and Restated Indenture, DVI VIII
granted a first priority security interest in and pledged all of the Loan
Documents in favor of U.S. Bank, N.A., as Trustee, for the benefit of a
noteholder which purchased asset backed promissory notes issued by DVI VIII (the
"Noteholder");

<PAGE>

                                                                       #0873-007

                  WHEREAS, DVI contributed other Loans with DIS or certain
affiliates of DIS to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, DIS is in default under the terms of the Loan;

                  WHEREAS, DIS has requested USBPS to modify the Loan to reflect
an adjustment in payments;

                  WHEREAS, DIS and/or certain of its affiliates have agreed to
modify the Related Loans;

                  WHEREAS, DIS and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. DIS acknowledges that it is duly indebted to the Trustee in
the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the "AMENDED AND RESTATED RIDER A"). DIS may, at any time, prepay all
of the outstanding

                                       2
<PAGE>

                                                                       #0873-007

Obligations subject to an additional prepayment fee of 2% of such Obligations.
Partial prepayments of the Obligations shall not be permitted at any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by DIS and the satisfaction of each
of the following conditions:

                           (a) DIS and/or its affiliates shall have entered into
                  agreements on similar terms to this Agreement and otherwise in
                  form and substance satisfactory to USBPS, relating to the
                  Related Loans (the "Related Loan Modifications");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) DIS and/or its affiliates shall have entered into
                  the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the DIS Loan is further
subject to delivery to USBPS of all of the following, each in form and substance
satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. DIS hereby acknowledges and agrees that it has no, and will
not assert any, defenses, counterclaims or offsets to the Loan and AMENDED AND
RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #0873-007

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. DIS hereby releases the Noteholder, USBPS individually and
as agent for the Trustee and the special purpose entities for which the Trustee
holds collateral, from and against any claims, loss or damage of any kind or
nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #0873-007

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                    LEVERAGE RATIO            PERIOD
                                    --------------            ------

                                       4.50:1.0         04/30/05 - 10/30/05
                                       4.30:1.0         10/31/05 - 10/30/06
                                       4.00:1.0         10/31/06 - 10/30/07
                                       3.80:1.0         10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #0873-007

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. This paragraph is intentionally left blank.

                  11. DIS and the Company each represent and warrant that it has
been represented by an attorney of its choice and is fully aware of the terms
contained in this Agreement and AMENDED AND RESTATED RIDER A to which it is a
party which was voluntarily entered into without coercion or duress of any kind.

                  12. DIS represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of DIS to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by DIS of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of DIS's Articles of
Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which DIS is bound.

                                       6
<PAGE>

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                                    U.S. Bank Portfolio Services
                                    1310 Madrid Street, Suite 103
                                    Marshall, MN 56258
                                    Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR

                                       7
<PAGE>

                                                                       #0873-007

PROCEEDING RELATING TO THIS AGREEMENT AND ANY SCHEDULE OR FOR RECOGNITION AND
ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR THEREOF, TO THE EXCLUSIVE
JURISDICTION OF THE COURTS OF THE COMONWEALTH OF PENNSYLVANIA, THE COURTS OF THE
UNITED STATES OF AMERICA FOR THE EASTERN DISTRICT OF PENNSYLVANIA, AND APPELLATE
COURTS FROM ANY THEREOF, (B) CONSENT THAT ANY ACTION OR PROCEEDING SHALL BE
BROUGHT IN SUCH COURTS, AND WAIVE ANY OBJECTION THAT EACH MAY NOW OR HEREAFTER
HAVE TO THE VENUE OF ANY SUCH ACTION OR PROCEEDING IN ANY SUCH COURT, (C) AGREE
THAT SERVICE OF PROCESS OF ANY SUCH ACTION OR PROCEEDING MAY BE EFFECTED BY
CERTIFIED MAIL (OR ANY SUBSTANTIALLY SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO
THE APPROPRIATE PARTY AT ITS ADDRESS AS SET FORTH HEREIN, AND SERVICE MADE SHALL
BE DEEMED TO BE COMPLETED UPON THE EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS
AFTER THE SAME SHALL HAVE BEEN POSTED AS AFORESAID, AND (D) AGREE THAT NOTHING
HEREIN OR IN ANY EXHIBIT OR SCHEDULE SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF
PROCESS IN ANY OTHER MANNER PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH
HEREBY UNCONDITIONALLY WAIVES ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF
ACTION BASED UPON OR ARISING OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY
EXHIBIT AND THE TRANSACTIONS CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED
DOCUMENTS, ANY DEALINGS BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT
MATTER HEREOF OR THEREOF, AND/OR THE RELATIONSHIP THAT IS BEING

                                       8
<PAGE>

                                                                       #0873-007

ESTABLISHED BETWEEN USBPS AS AGENT FOR THE TRUSTEE AND THE UNDERSIGNED, PROVIDED
USBPS MAY IN ITS DISCRETION ENFORCE THE TERMS OF THE FORUM SELECTION PROVISIONS
IN THE LOANS.

                  20. DIS and the Company hereby release USBPS, the Trustee, and
the Noteholders from and against any claim, loss, or damage arising out of the
negotiation execution, and performance of the Loan or related matters prior to
the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES VIII, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    DIAGNOSTIC IMAGING SERVICES, INC. I

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

                                       10

<PAGE>

                                                                       #3230-001

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVI, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Santa Rosa Imaging, Inc., Beverly
Radiology Medical Group III, G.P. and Radnet Management, Inc., with offices at
PO Box 340086, Los Angeles, CA 90024 (collectively "RADNET"), and such other
signatories hereto.

                  WHEREAS, on or about September 19, 2001, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3230-001 dated September
19, 2001 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about September 19, 2001 (the
"SECURITY AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVI, L.L.C. ("DVI XVI")
and thereafter pursuant to an Amended and Restated Indenture, DVI XVI granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #3230-001

noteholder which purchased asset backed promissory notes issued by DVI XVI (the
"NOTEHOLDER");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #3230-001

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "RELATED LOAN
                  MODIFICATIONS");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #3230-001

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #3230-001

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                           LEVERAGE RATIO        PERIOD
                           --------------        ------

                              4.50:1.0     04/30/05 - 10/30/05
                              4.30:1.0     10/31/05 - 10/30/06
                              4.00:1.0     10/31/06 - 10/30/07
                              3.80:1.0     10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

#3230-001 owing to GECC, DVI and USBPS; all as determined for the Company and
its subsidiaries on a consolidated basis without duplication and in accordance
with generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and Amended and RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #3230-001

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                           U.S. Bank Portfolio Services
                           1310 Madrid Street, Suite 103
                           Marshall, MN 56258
                           Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #3230-001

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #3230-001

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #3230-001

                        LYON FINANCIAL SERVICES, INC. DBA U.S. BANK PORTFOLIO
                        SERVICES, AS SUCCESSOR SERVICER FOR DVI RECEIVABLES XVI,
                        L.L.C. AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                        By:_____________________________________________________

                        SANTA ROSA IMAGING, INC.

                        By:_____________________________________________________

                        BEVERLY RADIOLOGY MEDICAL GROUP III, G.P.

                        By:_____________________________________________________

                        RADNET MANAGEMENT, INC.

                        By:_____________________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:_____________________________________

                                       10
<PAGE>

                                                                       #3225-001

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVI, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Imaging Center of La Habra, Inc.,
Beverly Radiology Medical Group III, G.P. and Radnet Management, Inc., with
offices at PO Box 340086, Los Angeles, CA 90024 (collectively "RADNET"), and
such other signatories hereto.

                  WHEREAS, on or about September 19, 2001, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3225-001 dated September
19, 2001 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about September 19, 2001 (the
"SECURITY AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVI, L.L.C. ("DVI XVI")
and thereafter pursuant to an Amended and Restated Indenture, DVI XVI granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #3225-001

noteholder which purchased asset backed promissory notes issued by DVI XVI (the
"NOTEHOLDER");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #3225-001

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "RELATED LOAN
                  MODIFICATIONS");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #3225-001

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #3225-001

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                   LEVERAGE RATIO          PERIOD
                                   --------------          ------

                                      4.50:1.0       04/30/05 - 10/30/05
                                      4.30:1.0       10/31/05 - 10/30/06
                                      4.00:1.0       10/31/06 - 10/30/07
                                      3.80:1.0       10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

#3225-001 owing to GECC, DVI and USBPS; all as determined for the Company and
its subsidiaries on a consolidated basis without duplication and in accordance
with generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and Amended and Restated Rider A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
<PAGE>

                                                                       #3225-001

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                  U.S. Bank Portfolio Services
                  1310 Madrid Street, Suite 103
                  Marshall, MN 56258
                  Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #3225-001

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #3225-001

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #3225-001

                       LYON FINANCIAL SERVICES, INC. DBA U.S. BANK PORTFOLIO
                       SERVICES, AS SUCCESSOR SERVICER FOR DVI RECEIVABLES XVI,
                       L.L.C. AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                       By:_____________________________________________________

                       IMAGING CENTER OF LA HABRA

                       By:_____________________________________________________

                       BEVERLY RADIOLOGY MEDICAL GROUP III, G.P.

                       By:_____________________________________________________

                       RADNET MANAGEMENT, INC.

                       By:_____________________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:_____________________________________

                                       10
<PAGE>

                                                                       #3222-001

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVI, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Temecula Valley Imaging, Inc.,
Beverly Radiology Medical Group III, G.P. and Diagnostic Imaging Services, Inc.,
with offices at 1516 Cotner Avenue, Los Angeles, CA 90025 (collectively "DIS"),
and such other signatories hereto.

                  WHEREAS, on or about September 19, 2001, DIS executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3222-001 dated September
19, 2001 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of DIS to DVI (collectively the "OBLIGATIONS"), DIS, pursuant to a
Master Security Agreement dated on or about September 19, 2001 (the "SECURITY
AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of DIS to DVI, DIS delivered to DVI the guarantee (the "GUARANTEE")
of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE" together
with the Loan and ancillary documents are, collectively the "LOAN DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVI, L.L.C. ("DVI XVI")
and thereafter pursuant to an Amended and Restated Indenture, DVI XVI granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #3222-001

noteholder which purchased asset backed promissory notes issued by DVI XVI (the
"NOTEHOLDER");

                  WHEREAS, DVI contributed other Loans with DIS or certain
affiliates of DIS to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, DIS is in default under the terms of the Loan;

                  WHEREAS, DIS has requested USBPS to modify the Loan to reflect
an adjustment in payments;

                  WHEREAS, DIS and/or certain of its affiliates have agreed to
modify the Related Loans;

                  WHEREAS, DIS and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. DIS acknowledges that it is duly indebted to the Trustee in
the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #3222-001

"AMENDED AND RESTATED RIDER A"). DIS may, at any time, prepay all of the
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by DIS and the satisfaction of each
of the following conditions:

                           (a) DIS and/or its affiliates shall have entered into
                  agreements on similar terms to this Agreement and otherwise in
                  form and substance satisfactory to USBPS, relating to the
                  Related Loans (the "RELATED LOAN MODIFICATIONS");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) DIS and/or its affiliates shall have entered into
                  the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the DIS Loan is further
subject to delivery to USBPS of all of the following, each in form and substance
satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. DIS hereby acknowledges and agrees that it has no, and will
not assert any, defenses, counterclaims or offsets to the Loan and AMENDED AND
RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

                                                                       #3222-001

default under the Loan as modified by this Agreement, and USBPS shall have all
remedies thereunder.

                  8. DIS hereby releases the Noteholder, USBPS individually and
as agent for the Trustee and the special purpose entities for which the Trustee
holds collateral, from and against any claims, loss or damage of any kind or
nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #3222-001

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                    LEVERAGE RATIO       PERIOD
                                    --------------       ------

                                      4.50:1.0     04/30/05 - 10/30/05
                                      4.30:1.0     10/31/05 - 10/30/06
                                      4.00:1.0     10/31/06 - 10/30/07
                                      3.80:1.0     10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
<PAGE>

                                                                       #3222-001

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIN. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. DIS, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. DIS represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of DIS to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by DIS of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of DIS's Articles of

                                       6
<PAGE>

                                                                       #3222-001

Incorporation, Articles of Formation, Partnership Agreement or other agreement
or law by which DIS is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                           U.S. Bank Portfolio Services
                           1310 Madrid Street, Suite 103
                           Marshall, MN 56258
                           Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #3222-001

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #3222-001

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. DIS, the Company and the Guarantor hereby release USBPS,
the Trustee, and the Noteholders from and against any claim, loss, or damage
arising out of the negotiation execution, and performance of the Loan or related
matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #3222-001

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XVI, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    TEMECULA VALLEY IMAGING, INC.

                                    By: ________________________________________

                                    BEVERLY RADIOLOGY MEDICAL GROUP III, G.P.

                                    By: ________________________________________

                                    DIAGNOSTIC IMAGING SERVICES, INC.

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:_____________________________________

                                       10
<PAGE>

                                                                       #3218-001

                           AMENDMENT TO LOAN DOCUMENTS
                           ---------------------------

                  AGREEMENT made as of June 30, 2004 ("AMENDMENT AGREEMENT" or
"AGREEMENT") by and between LYON FINANCIAL SERVICES, INC. DBA U.S. BANK
PORTFOLIO SERVICES, as Successor Servicer for DVI Receivables XVI, L.L.C. and as
Agent for U.S. Bank, N.A., as Trustee, with offices at 1310 Madrid Street, Suite
103, Marshall, Minnesota 56258 ("USBPS") and Antelope Valley MRI, Inc., Beverly
Radiology Medical Group III, G.P., Radnet Management, Inc. and Radnet Sub, Inc.,
with offices at PO Box 340086, Los Angeles, CA 90024 (collectively "RADNET"),
and such other signatories hereto.

                  WHEREAS, on or about September 19, 2001, Radnet executed and
delivered to DVI Financial Services Inc. ("DVI") a Master Loan Agreement
collectively with the Secured Promissory Note Number #3218-001 dated September
19, 2001 (the "LOAN");

                  WHEREAS, to secure the payment of the Loan and all other
obligations of Radnet to DVI (collectively the "OBLIGATIONS"), Radnet, pursuant
to a Master Security Agreement dated on or about September 19, 2001 (the
"SECURITY AGREEMENT"), granted DVI a first priority security interest in certain
Collateral described therein;

                  WHEREAS, to further secure payment of the Note and all other
Obligations of Radnet to DVI, Radnet delivered to DVI the guarantee (the
"GUARANTEE") of Primedex Health Systems, Inc. (the "GUARANTOR") (the "GUARANTEE"
together with the Loan and ancillary documents are, collectively the "LOAN
DOCUMENTS");

                  WHEREAS, substantially contemporaneously therewith, DVI
contributed all of the Loan Documents to DVI Receivables XVI, L.L.C. ("DVI XVI")
and thereafter pursuant to an Amended and Restated Indenture, DVI XVI granted a
first priority security interest in and pledged all of the Loan Documents in
favor of U.S. Bank, N.A., as Trustee, for the benefit of a

<PAGE>

                                                                       #3218-001

noteholder which purchased asset backed promissory notes issued by DVI XVI (the
"NOTEHOLDER");

                  WHEREAS, DVI contributed other Loans with Radnet or certain
affiliates of Radnet to this and other DVI securitizations (collectively the
"RELATED LOANS");

                  WHEREAS, Radnet is in default under the terms of the Loan;

                  WHEREAS, Radnet has requested USBPS to modify the Loan to
reflect an adjustment in payments;

                  WHEREAS, Radnet and/or certain of its affiliates have agreed
to modify the Related Loans;

                  WHEREAS, Radnet and certain of its affiliates are engaged in
negotiations to restructure or modify certain loan agreements, loans and
promissory notes with each of General Electric Capital Corporation ("GECC") and
DVI (with respect to GECC, the "GECC MODIFICATION", and with respect to DVI, the
"DVI MODIFICATION");

                  WHEREAS, subject to the following terms and conditions, USBPS
is willing to modify the Loan as hereinafter provided.

                  NOW, THEREFORE, the parties agree as follows:

                  1. All of the Whereas clauses are incorporated herein as if
hereinafter set forth at full length.

                  2. Radnet acknowledges that it is duly indebted to the Trustee
in the sum set forth on AMENDED AND RESTATED RIDER A annexed hereto, and has no
defenses, counterclaims or offsets to such indebtedness.

                  3. USBPS as Agent for the Trustee will modify the Loan to
provide for payments to commence in accordance with the attached revised payment
schedule (the

                                       2
<PAGE>

                                                                       #3218-001

"AMENDED AND RESTATED RIDER A"). Radnet may, at any time, prepay all of the
outstanding Obligations subject to an additional prepayment fee of 2% of such
Obligations. Partial prepayments of the Obligations shall not be permitted at
any time.

                  4. This Agreement shall become effective upon the date that
USBPS receives this Agreement duly executed by Radnet and the satisfaction of
each of the following conditions:

                           (a) Radnet and/or its affiliates shall have entered
                  into agreements on similar terms to this Agreement and
                  otherwise in form and substance satisfactory to USBPS,
                  relating to the Related Loans (the "RELATED LOAN
                  MODIFICATIONS");

                           (b) reimbursement of USBPS's legal fees incurred in
                  connection with the execution of this Agreement and the
                  Related Loan Modifications, aggregating $50,000, shall have
                  been received by USBPS;

                           (c) Radnet and/or its affiliates shall have entered
                  into the GECC Modification and the DVI Modification.

                  5. The closing of the restructuring of the Radnet Loan is
further subject to delivery to USBPS of all of the following, each in form and
substance satisfactory to USBPS and its counsel:

                           (a) The executed AMENDED AND RESTATED RIDER A;

                           (b) An executed copy of this Agreement;

                           (c) Such other documents, including UCC financing
                  statements as USBPS reasonably requests.

                  6. Radnet hereby acknowledges and agrees that it has no, and
will not assert any, defenses, counterclaims or offsets to the Loan and AMENDED
AND RESTATED RIDER A and acknowledges and agrees that the Trustee holds a
first-priority security interest in the Collateral.

                  7. Any default or other breach of any obligation under the
GECC Modification, the DVI Modification, or any of the Related Loan
Modifications shall constitute a

                                       3
<PAGE>

#3218-001 default under the Loan as modified by this Agreement, and USBPS shall
have all remedies thereunder.

                  8. Radnet hereby releases the Noteholder, USBPS individually
and as agent for the Trustee and the special purpose entities for which the
Trustee holds collateral, from and against any claims, loss or damage of any
kind or nature arising out of the Loan.

                  9. So long as any of the Obligations remain outstanding,
Radnet Management, Inc. (the "COMPANY") agrees as follows:

                           (i) FINANCIAL REPORTING. The Company shall furnish
the following documents or information to USBPS:

                                    (A) Within 30 days after the end of each
Fiscal Quarter (as defined below) (i) (or 90 days in respect of the last month
of the fiscal year), the Company's consolidated, consolidating and on a center
by center basis, financial statements, including the most recent annual report,
balance sheet (not on a center by center basis) and income statement, prepared
in accordance with generally accepted accounting principles, which reports, the
Company warrants, shall fully and fairly represent the true financial condition
of the Company and (ii) updated projections for the Company and for each center;

                                    (B) any other financial information normally
provided by the Company to the public; and

                                    (C) Such other financial data or information
relative to this Amendment Agreement, including, without limitation, listings of
serial numbers or other identification data and confirmations of such
information, as USBPS may time-to-time reasonably request.

                           (ii) NO AMENDMENTS. Subsequent to the date of this
Amendment Agreement, the Company will not agree or consent to any amendments or
modifications to any agreement between the Company and DVI, GECC or Wells Fargo
Foothill, Inc. ("FOOTHILL") containing terms (including, but not limited to,
increasing interest rates, accelerating the principal amortization or maturity,
new or more stringent defaults, additional collateral, and new remedies
provisions) that would be more onerous to the Company, or adversely impact or
affect GECC with respect to the terms of this Amendment Agreement.

                           (iii) DISTRIBUTIONS. The Company shall not make any
distribution or declare or pay any dividends (in cash or other property, other
than common stock) on, or purchase, acquire, redeem, or retire any of the
Company's stock, of any class, whether now or hereafter outstanding
(collectively, "DISTRIBUTIONS"); PROVIDED, HOWEVER, that so long as no

                                       4
<PAGE>

                                                                       #3218-001

default shall have occurred and be continuing immediately prior to or after
giving effect to any such payment, (a) the Company may make Distributions to
Primedex Health Systems, Inc., a New York corporation (the "PARENT") (1) in
amounts necessary to pay customary expenses of Parent in the ordinary course of
its business as a public holding company (including salaries and related
reasonable and customary expenses incurred by employees of Parent) in an
aggregate amount not to exceed $750,000 in any fiscal year, (2) in amounts
necessary to enable Parent to pay taxes when due and owing by it in the ordinary
course of its business as a holding company and (3) in amounts necessary to
enable Parent to pay interest on those certain 11.5% Series A Convertible
Subordinated Notes due June 30, 2008, issued by Parent on June 25, 1993, and (b)
Parent may make Distributions in the form of common stock.

                           (iv) FIXED CHARGE COVERAGE RATIO. Commencing April
30, 2005, the Company shall not permit the Fixed Charge Coverage Ratio, (a) to
be less than 1.0:1 as of the end of each April, July, October and January (each,
a "FISCAL QUARTER") ending prior to January 1, 2007, and (b) to be less than
1.05:1 as of the last day of each Fiscal Quarter ending thereafter. "FIXED
CHARGE COVERAGE RATIO" means for any period, the ratio of (i) EBITDA for such
period MINUS cash capital expenditures made (to the extent not already incurred
in a prior period) or incurred during such period, to (ii) the sum of (a)
interest expense, (b) principal payments required to be paid during such period
in respect of indebtedness, and (c) all federal, state, and local income taxes
accrued, all as determined for the twelve months ending on the determination
date for the Company and its subsidiaries on a consolidated basis without
duplication and in accordance with generally accepted accounting principles
consistently applied. "EBITDA" means, with respect to any fiscal period, the
Company's and its subsidiaries' consolidated net earnings (or loss), minus
extraordinary gains and interest income, plus interest expense, income taxes,
and depreciation and amortization for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (v) LEVERAGE RATIO. The Company shall not permit the
Leverage Ratio, as determined as of the end of each Fiscal Quarter, to be
greater than the amount set forth in the following table for the Fiscal Quarters
ending in the period set forth opposite thereto:

                                    LEVERAGE RATIO        PERIOD
                                    --------------        ------

                                       4.50:1.0     04/30/05 - 10/30/05
                                       4.30:1.0     10/31/05 - 10/30/06
                                       4.00:1.0     10/31/06 - 10/30/07
                                       3.80:1.0     10/31/07 - 10/30/08

                  "LEVERAGE RATIO" means, at any date of determination, the
ratio of (a) Total Debt at such date to (b) EBITDA for the applicable period
ending on such date. "TOTAL DEBT" means, as of any date of determination,
without duplication, the sum of (a) the outstanding aggregate amount of the
obligations for borrowed money, (b) the outstanding principal amount of capital
leases, (c) the outstanding principal amount of purchase money indebtedness, (d)
the outstanding principal amount of funded debt, and (e) the outstanding
principal amount of all obligations

                                       5
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                                                                       #3218-001

owing to GECC, DVI and USBPS; all as determined for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vi) EBITDA MARGIn. The Company shall not permit the
EBITDA Margin to be less than 25% as of the end of any Fiscal Quarter ending on
or after April 30, 2005. "EBITDA MARGIN" means for any period, the ratio of (a)
EBITDA for such period, to (b) net revenues (excluding the professional service
fee component of radiology services) for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (vii) RECEIVABLE DAYS. The Company shall not permit
the Receivable Days to exceed 65 days as of the end of any Fiscal Quarter ending
on or after April 30, 2005. "RECEIVABLE DAYS" means for any period, a number
equal to (a) 365 divided by (b) the result of (i) net revenues for such period
divided by (ii) net receivables for such period, all as determined for the
twelve months ending on the determination date for the Company and its
subsidiaries on a consolidated basis without duplication and in accordance with
generally accepted accounting principles consistently applied.

                           (viii) NAME CHANGES, ETC. The Company agrees that it
shall not change its name or jurisdiction of organization without giving 30 days
prior written notice to USBPS.

                  10. To induce USBPS on behalf of the Trustee to enter this
Agreement, the Guarantor hereby affirms and restates its Guarantee as related to
this Loan and AMENDED AND RESTATED RIDER A.

                  11. Radnet, the Company and the Guarantor each represent and
warrant that each has been represented by an attorney of its choice and is fully
aware of the terms contained in this Agreement and AMENDED AND RESTATED RIDER A
to which it is a party which was voluntarily entered into without coercion or
duress of any kind.

                  12. Radnet represents and warrants to USBPS on behalf of the
Noteholders and Trustee that all necessary actions on the part of Radnet to be
taken in connection with the execution, delivery and performance of this
Agreement have been taken; the performance by Radnet of this Agreement and the
AMENDED AND RESTATED RIDER A will not violate any of

                                       6
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                                                                       #3218-001

Radnet's Articles of Incorporation, Articles of Formation, Partnership Agreement
or other agreement or law by which Radnet is bound.

                  13. Any notice, request, direction, consent, approval, waiver
or other communication required or permitted under this Agreement to be sent
must be in writing and will become effective only upon delivery to USBPS at the
address set forth herein as follows:

                           U.S. Bank Portfolio Services
                           1310 Madrid Street, Suite 103
                           Marshall, MN 56258
                           Attn: Jane Fox, Director of Operations

                  14. Except as provided herein, and in the AMENDED AND RESTATED
RIDER A, all of the other provisions of the Loan Documents not restated will
remain in effect.

                  15. This Agreement and the documents referenced herein
constitute the entire and final agreement among the parties with respect to the
subject matter hereof and there are no agreements, understandings, warranties or
representations among the parties with respect to these matters except as set
forth herein.

                  16. This Agreement will inure to the benefit of and bind the
parties and their respective successors and permitted assigns.

                  17. Neither this Agreement nor any of the provisions hereof
can be changed, waived, discharged or terminated except by an instrument in
writing signed by the parties against whom such enforcement of the change,
waiver, discharge or termination is sought.

                  18. This Agreement will be interpreted and construed under the
laws of the Commonwealth of Pennsylvania, regardless of the domicile of any
party and will be considered to have been made, executed and performed in
Pennsylvania.

                                       7
<PAGE>

                                                                       #3218-001

                  19. THE UNDERSIGNED, AND SUBJECT TO THE PROVISIONS CONTAINED
HEREIN, USBPS FOR ITSELF AND AS AGENT FOR THE TRUSTEE, (A) AGREE TO SUBMIT FOR
THEMSELVES, IN ANY LEGAL ACTION OR PROCEEDING RELATING TO THIS AGREEMENT AND ANY
SCHEDULE OR FOR RECOGNITION AND ENFORCEMENT OF ANY JUDGMENT IN RESPECT HEREOF OR
THEREOF, TO THE EXCLUSIVE JURISDICTION OF THE COURTS OF THE COMONWEALTH OF
PENNSYLVANIA, THE COURTS OF THE UNITED STATES OF AMERICA FOR THE EASTERN
DISTRICT OF PENNSYLVANIA, AND APPELLATE COURTS FROM ANY THEREOF, (B) CONSENT
THAT ANY ACTION OR PROCEEDING SHALL BE BROUGHT IN SUCH COURTS, AND WAIVE ANY
OBJECTION THAT EACH MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR
PROCEEDING IN ANY SUCH COURT, (C) AGREE THAT SERVICE OF PROCESS OF ANY SUCH
ACTION OR PROCEEDING MAY BE EFFECTED BY CERTIFIED MAIL (OR ANY SUBSTANTIALLY
SIMILAR FORM OF MAIL), POSTAGE PREPAID, TO THE APPROPRIATE PARTY AT ITS ADDRESS
AS SET FORTH HEREIN, AND SERVICE MADE SHALL BE DEEMED TO BE COMPLETED UPON THE
EARLIER OF ACTUAL RECEIPT OR FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN POSTED
AS AFORESAID, AND (D) AGREE THAT NOTHING HEREIN OR IN ANY EXHIBIT OR SCHEDULE
SHALL AFFECT THE RIGHT TO EFFECT SERVICE OF PROCESS IN ANY OTHER MANNER
PERMITTED BY LAW. USBPS AND THE UNDERSIGNED EACH HEREBY UNCONDITIONALLY WAIVES
ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING
OUT OF, DIRECTLY OR INDIRECTLY, THIS AGREEMENT, ANY EXHIBIT AND THE TRANSACTIONS

                                       8
<PAGE>

                                                                       #3218-001

CONTEMPLATED HEREBY AND THEREBY, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS
BETWEEN THE PARTIES HERETO RELATING TO THE SUBJECT MATTER HEREOF OR THEREOF,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN USBPS AS AGENT FOR THE
TRUSTEE AND THE UNDERSIGNED, PROVIDED USBPS MAY IN ITS DISCRETION ENFORCE THE
TERMS OF THE FORUM SELECTION PROVISIONS IN THE LOANS.

                  20. Radnet, the Company and the Guarantor hereby release
USBPS, the Trustee, and the Noteholders from and against any claim, loss, or
damage arising out of the negotiation execution, and performance of the Loan or
related matters prior to the date hereof.

                  21. This Agreement may be executed in two or more counterparts
and each counterpart shall be deemed an original.

                                       9
<PAGE>

                                                                       #3218-001

                                    LYON FINANCIAL SERVICES, INC. DBA U.S.
                                    BANK PORTFOLIO SERVICES, AS SUCCESSOR
                                    SERVICER FOR DVI RECEIVABLES XVI, L.L.C.
                                    AND AS AGENT FOR U.S. BANK, N.A., AS TRUSTEE

                                    By: ________________________________________

                                    ANTELOPE VALLEY MRI

                                    By: ________________________________________

                                    BEVERLY RADIOLOGY MEDICAL GROUP III, G.P.

                                    By: ________________________________________

                                    RADNET MANAGEMENT, INC.

                                    By: ________________________________________

                                    RADNET SUB, INC.

                                    By: ________________________________________

ACKNOWLEDGED AND AGREED TO:

Primedex Health Systems, Inc., Guarantor

By:_____________________________________

                                       10

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