Document:

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                                                                  EXHIBIT 10.59

                              EMPLOYMENT AGREEMENT

         THIS EMPLOYMENT AGREEMENT (the "Agreement") entered into as of this 9th
day of December 1997, between US Diagnostic Inc. (the "Company"), and Francis J.
Harkins, Jr. (the "Executive").

         WHEREAS, the Company desires to ensure the availability to the Company
of the Executive's services, and the Executive is willing to enter into such
employment and render such services, all upon and subject to the terms and
conditions contained in this Agreement;

         NOW, THEREFORE, in consideration of the premises and the mutual
covenants set forth in this Agreement, and intending to be legally bound, the
Company and the Executive agree as follows:

         1.       TERM OF EMPLOYMENT.
         (a)      TERM. The Company hereby to employ the Executive, and the
Executive hereby accepts employment with the Company, for a period commencing on
the date of this Agreement and continuing through November 30, 2000 (the
"Term").

         (b)      CONTINUING EFFECT. Notwithstanding any termination of this
Agreement at the end of the Term or otherwise, the provisions of Sections 6 and
7 shall remain in full force and effect and the provisions of Sections 6(a),
6(c) and 7 shall be binding upon the legal representatives, successors and
assigns of the Executive, except as otherwise provided in this Agreement.

         2.       DUTIES.

         (a)      GENERAL DUTIES. The Executive's initial title shall be
Executive Vice President and General Counsel of the Company and he shall have
such duties and responsibilities as may be established by the Board of Directors
or Chief Executive Officer of the Company. The Executive will use his best
efforts to perform his duties and discharge his responsibilities pursuant to
this Agreement competently, carefully and faithfully.

         (b)      DEVOTION OF TIME. The Executive will devote substantially full
time during normal business hours (exclusive of periods of sickness and
disability and of such normal holiday and vacation periods as have been
established by the Company) to the affairs of the Company. It is expressly
understood that the Executive will not enter the employ of or serve as a
consultant to, or in any way perform any services with or without compensation
to, any other persons, business or organization without the prior consent of the
board of directors of the Company; provided, that the Executive shall be
permitted to devote a limited amount of his time, without compensation, to
charitable or similar organizations.

         3.       COMPENSATION AND EXPENSES.

         (a)      SALARY. For the services of the Executive to be rendered under
this Agreement, the Company shall pay the Executive an annual base salary of
$135,000. The annual base salary under this Section 3(a) will be reduced,
however, to the extent that the Executive elects to defer any portion thereof
under the terms of any deferred compensation or savings plan maintained by the
Company. The Company will pay the Executive his annual salary in equal
installments no less frequently than twice monthly in accordance with the
Company's policies.

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         (b)      BONUS. The Executive will have the opportunity to participate
in bonuses at the end of each fiscal year during which he is employed, which
bonus shall be set forth by the Board of Directors and/or the CEO in its
discretion.

         (c)      STOCK OPTIONS. Executive will be granted 25,000 options under
the Company's 1995 Long Term Incentive Plan ("Plan") at an exercise price equal
of FMV per share. The options shall vest ratably over the term of the contract.
In the event of a change in control of the Company, as defined in the plan, any
remaining portion of the 25,000 options not yet vested shall automatically vest.
Executive may also receive discretionary grants of options under the Plan in the
sole discretion of the Company's Board of Directors.

         (d)      EXPENSES. In addition to any compensation received pursuant to
Section 3(a) and (b), the Company will reimburse or advance funds to the
Executive for all reasonable travel, entertainment and miscellaneous expenses
incurred in connection with the performance of his duties under this Agreement,
provided that the Executive properly accounts for such expenses to the Company
in accordance with the Company's practices. Such reimbursement or advances will
be made in accordance with policies and procedures of the Company in effect from
time to time relating to reimbursement of or advances to executive officers.

         4.       BENEFITS.

         (a)      VACATION. For each 12-month period during the Term, the
Executive will be entitled to four (4) weeks of vacation without loss of
compensation or other benefits to which he is entitled under this Agreement, to
be taken at such times as the Executive may select and as shall be convenient
for the affairs of the Company.

         (b)      EMPLOYEE BENEFIT PROGRAMS. During the Term, the Executive will
be entitled to participate in any pension, insurance or other employee benefit
plan that is maintained at that time by the Company for its executive officers,
including programs of life and medical insurance and reimbursement of membership
fees in civic, social and professional organizations.

         (c)      AUTOMOBILE. The Company shall provide the Executive with a
non-accountable automobile allowance of $500 per month which includes all costs
associated with the use of an automobile including, without limitation, lease or
loan payments, fuel, maintenance and insurance.

         5.       TERMINATION.

         (a)      TERMINATION FOR CAUSE. The Company may terminate the
Executive's employment for Cause at any time by giving written notice of
termination to the Executive, which shall be effective on the effective date set
forth in paragraph 10 hereof. Executive shall have no right to compensation,
bonus or reimbursement under Section 3, or to participate in any employee
benefit programs under Section 4, for any period subsequent to the effective
date of termination. "Cause" shall mean: (i) the material and repeated failure
by Executive to perform his/her job responsibilities competently, (ii)
dishonesty, fraud, theft or misappropriation in the performance of his/her job
responsibilities, or (iii) any material breach of any provision of Sections
2(a), 6 or 7.

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         (b)      DEATH OR DISABILITY. The obligations of the Company hereunder
will terminate upon the death or disability of the Executive. For purposes of
this Section 5(b), "disability" shall mean that for a period of six months in
any 12-month period the Executive is incapable of substantially fulfilling the
duties set forth in Section 2 because of physical, mental or emotional
incapacity resulting from injury, sickness or disease.

         (c)      SPECIAL TERMINATION. In the event that (i) the Company
materially breaches this Agreement or the performance of its duties and
obligations hereunder; or (ii) any entity or person not now an executive officer
of the Company becomes either individually or as part of a group the beneficial
owner of 40% or more of the Company's common stock; or (iii) the merger,
consolidation, reorganization or liquidation of the Company (a "Change in
Control"), the Executive, by written notice to the Company, may elect to deem
the Executive's employment hereunder to have been terminated by the Company
without cause, in which event the Executive shall receive lump sum compensation
equal to 2.0 times his annual salary and incentive or bonus payments, if any, as
shall have been paid to the Executive during the Company's most recent fiscal
year. If the total amount of compensation under this paragraph were to exceed
three (3) times the Executive's base amount (the average annual taxable
compensation of the Executive for the five (5) years preceding the year in which
the change of control occurs) the Company and the Executive may agree to reduce
the lump sum compensation to be received by Executive in order to avoid the
imposition of the "golden parachute" tax. Alternatively, in such event, the
Executive, by written notice to the Company, may elect to refuse all further
obligations of the Company under Section 3 and Section 4 and to release the
Company with respect thereto, in which event the Company shall release the
Executive from the provisions of Section 6.

         6.       NONCOMPETITION AGREEMENT.

         (a)      COMPETITION WITH THE COMPANY. Except as provided for in
Sections 2(b) and 6(b) hereof, until termination of his employment and for a
period of 12 months commencing on the date of termination, the Executive,
directly or indirectly, in association with or as a stockholder, director,
officer, consultant, employee, partner, joint venturer, member or otherwise of
or through any person, firm, corporation, partnership, association or other
entity, will not compete with the Company or any of its affiliates in the offer,
sale or marketing of radiology products or services, including radiology
practice management services, that are competitive with the products or services
offered by the Company as of the date of this Agreement, or any other business
engaged in by the Company after the date of this Agreement in which Executive is
actively involved on behalf of the Company, within any metropolitan area in the
United States or elsewhere in which the Company is then engaged in the offer and
sale of competitive products or services except as provided in (b) below.
Additionally, the foregoing shall not prevent Executive from accepting
employment with an enterprise engaged in two or more lines of business, one of
which is the same or similar to the Company's business (the "Prohibited
Business") if Executive's employment is totally unrelated to the Prohibited
Business; provided, further, the foregoing shall not prohibit Executive from
owning up to 5% of the securities of any publicly-traded enterprise provided
Executive is not an employee, director, officer, consultant to such enterprise
or otherwise reimbursed for services rendered to such enterprise.

         (b)      SOLICITATION OF CUSTOMERS. During the periods in which the
provisions of Section 6(a) shall be in effect, the Executive, directly or
indirectly, will not seek Prohibited Business from any Customer (as defined

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below) on behalf of any enterprise or business other than the Company, refer
Prohibited Business from any Customer to any enterprise or business other than
the Company or receive commissions based on sales or otherwise relating to the
Prohibited Business from any Customer, or any enterprise or business other than
the Company. For purposes of this Section 6(b), the term "Customer" means any
person, firm, corporation, partnership, association or other entity to which the
Company or any of its affiliates sold or provided goods or services during the
12-month period prior to the time at which any determination is required to be
made as to whether any such person, firm, corporation, partnership, association
or other entity is a Customer.

         (c)      NO PAYMENT. The Executive acknowledges and agrees that no
separate or additional payment will be required to be made to him in
consideration of his undertakings in this Section 6.

         (d)      RELEASE. The provisions of this Section 6 shall not apply if
this Agreement is terminated by the Company without cause.

         7.       NONDISCLOSURE OF CONFIDENTIAL INFORMATION. The Executive
acknowledges that during his employment he will learn and will have access to
confidential information regarding the Company and its affiliates, including
without limitation (i) confidential or secret plans, programs, documents,
agreements or other material relating to the business, services or activities of
the Company and its affiliates and (ii) trade secrets, market reports, customer
investigations, customer lists and other similar information that is proprietary
information of the Company or its affiliates (collectively referred to as
"Confidential Information"). All records, files, materials and Confidential
Information excluding personal items, obtained by the Executive in the course of
his employment with the Company are confidential and proprietary and shall
remain the exclusive property of the Company or its affiliates, as the case may
be. The Executive will not, except in connection with and as required by his
performance of his duties under this Agreement, for any reason use for his own
benefit or the benefit of any person or entity with which he may be associated
or disclose any such Confidential Information to any person, firm, corporation,
association or other entity for any reason or purpose whatsoever without the
prior written consent of the board of directors of the Company, unless such
Confidential Information previously shall have become public knowledge through
no action by or omission of the Executive.

         8.       ASSIGNABILITY. The rights and obligations of the Company under
this Agreement shall inure to the benefit of and be binding upon the successors
or assigns of the Company, provided that such successor or assign shall acquire
all or substantially all of the assets and business of the Company. The
Executive's obligations hereunder may not be assigned or alienated and any
attempt to do so by the Executive will be void.

         9.       SEVERABILITY.

         (a)      The Executive expressly agrees that the character, duration
and geographical scope of the provisions set forth in paragraphs 6 and 7 of this
Agreement are reasonable in light of the circumstances as they exist on the date
hereof. Should a decision, however, be made at a later date in any arbitration
or judicial proceeding that the character, duration or geographical scope of
such provisions is unreasonable, then it is the intention and the agreement of
the Executive and the Company that this Agreement shall be construed by the
tribunal in such a manner as to impose only those restrictions on the
Executive's conduct that are reasonable in the light of the circumstances and as

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are necessary to assure to the Company the benefits of this Agreement. If in an
arbitration or judicial proceeding, a tribunal shall refuse to enforce all of
the separate covenants deemed included herein because taken together they are
more extensive than necessary to assure to the Company the intended benefits of
this Agreement, it is expressly understood and agreed by the parties hereto that
the provisions of this Agreement that, if eliminated, would permit the remaining
separate provisions to be enforced in such proceeding shall be deemed
eliminated, for the purposes of such proceeding, from this Agreement.

         (b)      If any provision of this Agreement otherwise is deemed to be
invalid or unenforceable or is prohibited by the laws of the state or
jurisdiction where it is to be performed, this Agreement shall be considered
divisible as to such provision and such provision shall be inoperative in such
state or jurisdiction and shall not be part of the consideration moving from
either of the parties to the other. The remaining provisions of this Agreement
shall be valid and binding and of like effect as though such provision were not
included.

         10.      NOTICES AND ADDRESSES. All notices, offers, acceptance and any
other acts under this Agreement (except payment) shall be in writing, and shall
be sufficiently given if delivered to the addressees in person, by Federal
Express or similar receipted delivery, by facsimile delivery or, if mailed,
postage prepaid, by certified mail, return receipt requested, as follows:

           To the Company:          US  Diagnostic Inc.
                                    777 S. Flagler Drive
                                    West Palm Beach, Florida 33401
                                    Attention: Joseph A. Paul

           To the Executive:        Francis J. Harkins, Jr.
                                    9778 NW Terrace
                                    Miami, Florida 33178

or to such other address as either of them, by notice to the other may designate
from time to time. The transmission confirmation receipt from the sender's
facsimile machine shall be conclusive evidence of successful facsimile delivery.
Time shall be counted to, or from, as the case may be, the delivery in person or
by mailing.

         11.      COUNTERPARTS. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original but all of which
together shall constitute one and the same instrument. The execution of this
Agreement may be by actual or facsimile signature.

         12.      ARBITRATION. Any controversy, dispute or claim arising out of
or relating to this Agreement, or its interpretation, application,
implementation, breach or enforcement which the parties are unable to resolve by
mutual agreement, shall be settled by submission by either party of the
controversy, claim or dispute to binding arbitration in West Palm Beach, Florida
(unless the parties agree in writing to a different location), before a single
arbitrator in accordance with the rules of the American Arbitration Association
then in effect. In any such arbitration proceeding the parties agree to provide
all discovery deemed necessary by the arbitrator. The decision and award made by
the arbitrator shall be final, binding and conclusive on all parties hereto for
all purposes, and judgment may be entered thereon in any court having
jurisdiction thereof.

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         13.      ATTORNEY'S FEES. In the event that there is any controversy or
claim arising out of or relating to this Agreement, or to the interpretation,
breach or enforcement thereof, and any action or proceeding including that in
arbitration as provided for in Section 12 of this Agreement, is commenced to
enforce the provisions of this Agreement, the prevailing party shall be entitled
to an award by the court or arbitrator, as appropriate, of reasonable attorney's
fee, costs and expenses.

         14.      GOVERNING LAW. This Agreement and any dispute, disagreement,
or issue of construction or interpretation arising hereunder whether relating to
its execution, its validity, the obligations provided therein or performance
shall be governed or interpreted according to the internal laws of the State of
Florida without regard to choice of law considerations.

         15.      ENTIRE AGREEMENT. This Agreement constitutes the entire
Agreement between the parties and supersedes all prior oral and written
agreements between the parties hereto with respect to the subject matter hereof.
Neither this Agreement nor any provision hereof may be changed, waived,
discharged or terminated orally, except by a statement in writing signed by both
parties.

         16.      SECTION AND PARAGRAPH HEADINGS. The section and paragraph
headings in this Agreement are for reference purposes only and shall not affect
the meaning or interpretation of this Agreement.

                                      -6-
<PAGE>   7

           IN WITNESS WHEREOF, the Company and the Executive have executed this
Agreement as of the date and year first above written.

                             US DIAGNOSTIC. INC.

                             By: /s/ Joseph A. Paul
                                -----------------------------------------
                                Joseph A. Paul, Chief Executive Officer

                             --------------------------------------------
                             Francis J. Harkins, Jr.

                                      -7-<PAGE>   1
                                                                   Exhibit 10.60

                 AMENDMENT NO. 4 TO LOAN AND SECURITY AGREEMENT

         THIS AMENDMENT NO. 4 TO LOAN AND SECURITY AGREEMENT (the "AMENDMENT")
is made and entered into as of November 8, 1999, by and between US DIAGNOSTIC
INC. (the "BORROWER") and DVI BUSINESS CREDIT CORPORATION (the "LENDER").

                                   BACKGROUND

         A. Pursuant to a certain Loan and Security Agreement dated February 25,
1997, by and between Borrower and Lender, (as amended by various amendments and
side letters collectively the "LOAN AGREEMENT"), Lender agreed to extend to
Borrower a revolving line of credit up to a maximum amount of Thirty-Five
Million Dollars ($35,000,000.00) (the "LOAN").

         B. Borrower's obligation to repay the amounts outstanding under the
Loan is evidenced by that certain Note dated February 25, 1997, given by
Borrower to Lender (the "NOTE").

         C. At Lender's request, Borrower has agreed to execute, or to cause to
be executed, this Amendment and certain other documents related thereto, to,
INTER ALIA, divide the Loan and the Note into two (2) separate and distinct
obligations.

         D. All capitalized terms not otherwise defined herein shall have the
meanings set forth in the Loan Agreement.

         NOW, THEREFORE, the parties hereto, intending to be legally bound and
for good and valuable consideration, agree as follows:

         1. DIVISION OF LOAN. The Loan is hereby divided into two (2) separate
and distinct obligations as follows:

         (a) LOAN A. Loan "A" ("LOAN A") shall (i) have a Commitment Amount of
Twenty-Four Million Dollars ($24,000,000.00) ("COMMITMENT AMOUNT A"), which
includes the Overadvance Facility, (ii) be evidenced by, and payable in
accordance with the terms of, a secured promissory note ("NOTE A") in the form
attached hereto as EXHIBIT "A-1", (iii) have an initial outstanding principal
balance of $8,023,316.00, as of the date hereof, which principal balance
includes all Overadvance Loans currently outstanding under the Overadvance
Facility, (iv) have a Borrowing Base ("BORROWING BASE A") calculated using only
those Eligible Accounts of the Guarantors listed on EXHIBIT "A-2" (the "LOAN A
GUARANTORS"), thus limiting the Advances made under Note A to Borrowing Base A,
(v) be secured by the Guaranty, as confirmed by that certain Acknowledgment and
Confirmation of Guaranty executed and delivered by the Guarantors
contemporaneously herewith in the form attached hereto as EXHIBIT "C", (vi) be
secured by a security interest in, and lien on, the Collateral ("LOAN A
COLLATERAL") pledged by (A) the Borrower pursuant to the Loan Agreement, and (B)
the Loan A Guarantors pursuant to their respective Security Agreements dated
February 25, 1997, June 29, 1999, or November 8, 1999, as the case may be, as
amended by an Amendment to Security Agreement executed and delivered by the Loan
A Guarantors contemporaneously herewith in the form attached hereto as EXHIBIT
"A-3", and (vii) upon the occurrence of certain events, be secured by

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a springing security interest in, and lien on, the Loan B Collateral (as
hereafter defined) pledged by the Loan B Guarantors (as hereafter defined)
pursuant to that certain Security Agreement executed and delivered by the Loan B
Guarantors contemporaneously herewith in the form attached hereto as EXHIBIT
"A-4"; and

         (b) LOAN B. Loan "B" shall (i) have a commitment amount of Eleven
Million Dollars ($11,000,000.00) ("COMMITMENT AMOUNT B"), (ii) be evidenced by,
and payable in accordance with the terms of, a secured promissory note ("NOTE
B") in the form attached hereto as EXHIBIT "B-1", (iii) have an initial
outstanding principal balance of $5,819,357.83, as of the date hereof, (iv) have
a Borrowing Base ("BORROWING BASE B") calculated using only those Eligible
Accounts of the Guarantors listed on EXHIBIT "B-2" (the "LOAN B GUARANTORS"),
thus limiting the Advances made under Note B to Borrowing Base B, (v) be secured
by the Guaranty, as confirmed by that certain Acknowledgment and Confirmation of
Guaranty executed and delivered by the Guarantors in the form attached hereto as
EXHIBIT "C", (vi) be secured by a security interest in, and lien on, the
Collateral ("LOAN B COLLATERAL") pledged by the Loan B Guarantors pursuant to
their respective Security Agreements dated February 25, 1997, or June 29, 1999,
as the case may be, as amended by an Amendment to Security Agreement executed
and delivered by the Loan B Guarantors contemporaneously herewith in the form
attached hereto as EXHIBIT "B-3", and (vii) upon the occurrence of certain
events, be secured by a springing security interest in, and lien on, the Loan A
Collateral pledged by the Loan A Guarantors pursuant to that certain Security
Agreement executed and delivered by the Loan A Guarantors contemporaneously
herewith in the form attached hereto as EXHIBIT "B-4".

         2. EFFECT OF DIVISION.

         (a) RIGHT TO EXERCISE REMEDIES. Notwithstanding the division of the
Loan into Loan A and Loan B, Lender and all its successors and assigns, whether
as the holder of Note A, Note B, or both Note A and Note B, shall be entitled to
exercise any and all rights and remedies of Lender as set forth in the Loan
Agreement with respect to its respective Note and related collateral. To the
extent that Collateral consists of books and records, the parties hereto agree
that the holder of either Note A or Note B may take possession of such books and
records on its own behalf and as agent and bailee for the holder of the other
Note.

         (b) DEFINITIONS. For the purpose of interpreting the Loan Agreement,
the terms "Borrowing Base", "Collateral", "Commitment Amount", "Guarantor",
"Loan" and "Note" shall be deemed to mean collectively or individually, as the
case may be, "Borrowing Base A" and/or "Borrowing Base B", "Loan A Collateral"
and/or "Loan B Collateral", "Commitment Amount A" and/or "Commitment Amount B",
"Loan A Guarantors" and/or "Loan B Guarantors", "Loan A" and/or "Loan B" and
"Note A" and/or "Note B".

         3. REPORTING. Borrower agrees to provide, or to cause to be provided,
to Lender all Borrowing Base and other reporting information required under the
Loan Agreement in a format that permits Lender to accurately and timely
calculate and test Borrowing Base A and Borrowing Base B for purposes of making
Advances under Note A and/or Note B or otherwise.

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<PAGE>   3

         4. BASE RATE. The definition of "BASE RATE" in SECTION 1.1 of the Loan
Agreement is hereby deleted in its entirety and replaced with the following:

         "BASE RATE" means the variable rate of interest, per annum, published
by THE WALL STREET Journal as the "Prime Rate". The Base Rate is nothing more
nor less than an index for determining the interest rate payable under the terms
of this Agreement. The Base Rate is not necessarily the lowest or best rate
actually charged by Lender to any customer. In the event THE WALL STREET JOURNAL
ceases to publish the "Prime Rate", Lender may substitute any similar index for
the Base Rate."

         5. COUNTERPARTS. This Amendment may be executed in counterparts, all of
which when taken together constitute one and the same instrument.

         6. GOVERNING LAW. This Amendment is governed by and must be interpreted
and construed in accordance with the laws of the State of California (without
giving effect to any principles of conflicts of law).

         7. NO WAIVER. Lender is entering into this Amendment without any
forbearance, and without waiver or prejudice of, any Unmatured Default, any
Event of Default or any rights or remedies Lender has or may have under the Loan
Agreement and applicable law, all of which rights and remedies Lender hereby
expressly reserves.

         8. INTERPRETATION. Any provision in this Amendment that may be contrary
to any provision of the Loan Agreement shall prevail and override the Loan
Agreement. Except as expressly set forth herein, all other provisions of the
Loan Agreement shall remain unmodified and in full force and effect and there
shall be no diminishment in the rights and privileges of the Borrower or the
right and remedies of the Lender under the Loan Agreements as a result of the
division of the Loan as provided hereunder.

         IN WITNESS WHEREOF, Borrower and Lender have executed this Amendment as
of the date first above written.

US DIAGNOSTIC INC.                          DVI BUSINESS CREDIT
                                            CORPORATION

By: /s/ Joseph A. Paul                      By: /s/ Richard E. Miller
   -------------------------------              -------------------------------
Name: Joseph A. Paul                        Name:  Richard E. Miller
     -----------------------------               ------------------------------
Title: CEO                                  Title: President
      ----------------------------                -----------------------------

                                       3
<PAGE>   4

                            FORM OF PROMISSORY NOTE A

                                 (See Attached)

                                 EXHIBIT "A - 1"
                                       to
                 AMENDMENT NO. 4 TO LOAN AND SECURITY AGREEMENT

                                       4
<PAGE>   5

                                LOAN A GUARANTORS

HE Imaging Partners, Ltd.
Pinnacle Imaging Associates
Valley Presbyterian Magnetic Resonance Center, LP
Columbus Diagnostic Center, Inc.
MediTek - Broward, Inc.
MediTek - Palm Beach Gardens, Inc.
Advanced Medical Imaging Center, Inc.
MediTek - Greystone, Inc.
MediTek - ICOT, Inc.
Kaley Imaging, Inc.
MediTek - Palms, Inc.
MediTek - Premier North, Inc.
MediTek - Sun Coast, Inc.
Computerized Medical Imaging Center, Inc.
San Francisco Magnetic Resonance Center, Inc.
Modesto Imaging Center, Inc.
South Coast Radiologists, a Corporation
MediTek Premier, Inc.
Orange Park Diagnostic Center, Inc.
Salisbury Imaging, Inc.
Jefferson Magnetic Resonance Imaging, LLC

                                  EXHIBIT "A-2"
                                       to
                 AMENDMENT NO. 4 TO LOAN AND SECURITY AGREEMENT

                                       5
<PAGE>   6

                     FORM OF AMENDMENT TO SECURITY AGREEMENT

                               (LOAN A GUARANTORS)

                                 (See Attached)

                                 EXHIBIT "A - 3"
                                       to
                 AMENDMENT NO. 4 TO LOAN AND SECURITY AGREEMENT

                                       6
<PAGE>   7

                           FORM OF SECURITY AGREEMENT

                      (SPRINGING LIEN - LOAN A GUARANTORS)

                                 (See Attached)

                                  EXHIBIT "A-4"
                                       to
                 AMENDMENT NO. 4 TO LOAN AND SECURITY AGREEMENT

                                       7
<PAGE>   8

                            FORM OF PROMISSORY NOTE B

                                 (See Attached)

                                 EXHIBIT "B - 1"
                                       to
                 AMENDMENT NO. 4 TO LOAN AND SECURITY AGREEMENT

                                       8
<PAGE>   9

                                LOAN B GUARANTORS

MR of Kansas City, L.P.
Outpatient Radiology Center
Community Radiology of Virginia, Inc.
USDL Pittsburgh, Inc.
MediTek - Chatham Industries, Inc.
Heights Imaging Center, Inc.
Medical Marketing Development, Inc.
Santa Fe Imaging Center, Inc.
Affiliated Medical Imaging Network, Inc.
USD Dayton, Inc.
Westlake Diagnostic Center, Inc.
MICA Imaging, Inc.
Bridgeton MRI Center, Inc.
Kirkwood MRI Center, Inc.
AH Imaging, Inc.
DI Imaging Center, Inc.
LB Imaging, Inc.

                                  EXHIBIT "B-2"
                                       to
                 AMENDMENT NO. 4 TO LOAN AND SECURITY AGREEMENT

                                       9
<PAGE>   10

                    FORM OF AMENDMENT TO SECURITY AGREEMENTS

                               (LOAN B GUARANTORS)

                                 (See Attached)

                                  EXHIBIT "B-3"
                                       to
                 AMENDMENT NO. 4 TO LOAN AND SECURITY AGREEMENT

                                       10
<PAGE>   11

                           FORM OF SECURITY AGREEMENT

                      (SPRINGING LIEN - LOAN B GUARANTORS)

                                 (See Attached)

                                  EXHIBIT "B-4"
                                       to
                 AMENDMENT NO. 4 TO LOAN AND SECURITY AGREEMENT

                                       11
<PAGE>   12

                          FORM OF ACKNOWLEDGEMENT AND
                            CONFIRMATION OF GUARANTY

                                 (See Attached)

                                   EXHIBIT "C"

                                       to

                 AMENDMENT NO. 4 TO LOAN AND SECURITY AGREEMENT

                                       12

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