Document:

<PAGE>
                                                                 EXHIBIT 10.14.6

                                                                  Execution Copy

        SIXTH AMENDMENT TO CREDIT AGREEMENT AND LIMITED WAIVER OF DEFAULT

         This SIXTH AMENDMENT TO CREDIT AGREEMENT AND LIMITED WAIVER OF DEFAULT
(this "Amendment"), made and entered into as of March 25, 2003, is by and
between RTW, Inc., a Minnesota corporation (the "Borrower"), and U.S. Bank
National Association, a national banking association (the "Bank").

                                    RECITALS

         1. The Bank and the Borrower entered into a Credit Agreement dated as
of March 31, 2000 as amended by a First Amendment dated as of May 4, 2000, a
Second Amendment dated as of March 28, 2001, a Third Amendment dated as of
September 29, 2001, a Fourth Amendment and Limited Waiver of Default dated as of
March 22, 2002 and a Fifth Amendment dated as of December 17, 2002 (as amended,
the "Credit Agreement"); and

         2. The Borrower desires to amend certain provisions of the Credit
Agreement, and the Bank has agreed to make such amendments, subject to the terms
and conditions set forth in this Amendment.

                                    AGREEMENT

         NOW, THEREFORE, for good and valuable consideration, the receipt and
adequacy of which are hereby acknowledged, the parties hereto hereby covenant
and agree to be bound as follows:

         Section 1. Capitalized Terms. Capitalized terms used herein and not
otherwise defined herein shall have the meanings assigned to them in the Credit
Agreement, unless the context shall otherwise require.

         Section 2. Amendments. The Credit Agreement is hereby amended as
follows:

                  2.1 Term Note. Exhibit 1.1(B) to the Credit Agreement is
         hereby amended in its entirety to read as set forth in Exhibit A to
         this Amendment, which is made a part of the Credit Agreement as Exhibit
         1.1(B) thereto.

         Section 3. Effectiveness of Amendments. The amendments contained in
this Amendment shall become effective upon delivery by the Borrower of, and
compliance by the Borrower with, the following:

                  3.1 This Amendment and the Fourth Amended and Restated Term
         Note in the form of Exhibit A hereto (the "Note"), each duly executed
         by the Borrower.

                  3.2 A copy of the resolutions of the Board of Directors of the
         Borrower authorizing the execution, delivery and performance of this
         Amendment and Note certified as true and accurate by its Secretary or
         Assistant Secretary, along with a

<PAGE>

         certification by such Secretary or Assistant Secretary (i) certifying
         that there has been no amendment to the Articles of Incorporation or
         Bylaws of the Borrower since true and accurate copies of the same were
         delivered to the Bank with a certificate of the Secretary of the
         Borrower dated March 31, 2000, except for an amendment to the Articles
         of Incorporation dated November 7, 2002 allowing for a reverse split of
         the Borrower's common stock, a true and correct certified copy of which
         has been delivered by the Secretary of the Borrower, and (ii)
         identifying each officer of the Borrower authorized to execute this
         Amendment, the Note and any other instrument or agreement executed by
         the Borrower in connection with this Amendment (collectively, the
         "Amendment Documents"), and certifying as to specimens of such
         officer's signature and such officer's incumbency in such offices as
         such officer holds.

                  3.3 The Borrower shall have satisfied such other conditions as
         specified by the Bank, including payment of all unpaid legal fees and
         expenses incurred by the Bank through the date of this Amendment in
         connection with the Credit Agreement and the Amendment Documents.

         Section 4. Defaults and Waivers.

                  4.1 Events of Default and Unmatured Events of Default.

                  (a) Minimum EBIT. Under Section 6.17 of the Credit Agreement,
         the Borrower agreed not to permit its annualized EBIT, as of December
         31, 2002, to be less than $4,000,000. As of December 31, 2002, the
         Borrower's annualized EBIT was less than $4,000,000. As a result, an
         Event of Default has occurred under Section 7.1(c) of the Credit
         Agreement.

                  4.2 Waiver. Upon the date on which this Amendment becomes
         effective, the Bank hereby waives the Borrower's Default and Event of
         Default described in the preceding Section 4.1(a) (the "Existing
         Default"). The waiver of the Existing Default set forth above is
         limited to the express terms thereof, and nothing herein shall be
         deemed a waiver by the Bank of any other term, condition,
         representation or covenant applicable to the Borrower under the Credit
         Agreement (including but not limited to any future occurrence similar
         to the Existing Default) or any of the other agreements, documents or
         instruments executed and delivered in connection therewith, or of the
         covenants described therein. The waiver set forth herein shall not
         constitute a waiver by the Bank of any other Default or Event of
         Default, if any, under the Credit Agreement, and shall not be, and
         shall not be deemed to be, a course of action with respect thereto upon
         which the Borrower may rely in the future, and the Borrower hereby
         expressly waives any claim to such effect.

         Section 5. Representations, Warranties, Authority, No Adverse Claim.

                  5.1 Reassertion of Representations and Warranties, No Default.
         The Borrower hereby represents that on and as of the date hereof and
         after giving effect to this Amendment (a) all of the representations
         and warranties contained in the Credit Agreement are true, correct and
         complete in all respects as of the date hereof as though

                                       2
<PAGE>

         made on and as of such date, except for changes permitted by the terms
         of the Credit Agreement, and (b) there will exist no Default or Event
         of Default under the Credit Agreement as amended by this Amendment on
         such date which has not been waived by the Bank.

                  5.2 Authority, No Conflict, No Consent Required. The Borrower
         represents and warrants that the Borrower has the power and legal right
         and authority to enter into the Amendment Documents and has duly
         authorized as appropriate the execution and delivery of the Amendment
         Documents and other agreements and documents executed and delivered by
         the Borrower in connection herewith or therewith by proper corporate
         action, and none of the Amendment Documents nor the agreements
         contained herein or therein contravenes or constitutes a default under
         any agreement, instrument or indenture to which the Borrower is a party
         or a signatory or a provision of the Borrower's Articles of
         Incorporation, Bylaws or any other agreement or requirement of law, or
         result in the imposition of any Lien on any of its property under any
         agreement binding on or applicable to the Borrower or any of its
         property except, if any, in favor of the Bank. The Borrower represents
         and warrants that no consent, approval or authorization of or
         registration or declaration with any Person, including but not limited
         to any governmental authority, is required in connection with the
         execution and delivery by the Borrower of the Amendment Documents or
         other agreements and documents executed and delivered by the Borrower
         in connection therewith or the performance of obligations of the
         Borrower therein described, except for those which the Borrower has
         obtained or provided and as to which the Borrower has delivered
         certified copies of documents evidencing each such action to the Bank.

                  5.3 No Adverse Claim. The Borrower warrants, acknowledges and
         agrees that no events have been taken place and no circumstances exist
         at the date hereof which would give the Borrower a basis to assert a
         defense, offset or counterclaim to any claim of the Bank with respect
         to the Obligations.

         Section 6. Affirmation of Credit Agreement, Further References,
Affirmation of Security Interest. The Bank and the Borrower each acknowledge and
affirm that the Credit Agreement, as hereby amended, is hereby ratified and
confirmed in all respects and all terms, conditions and provisions of the Credit
Agreement, except as amended by this Amendment, shall remain unmodified and in
full force and effect. All references in any document or instrument to the
Credit Agreement are hereby amended and shall refer to the Credit Agreement as
amended by this Amendment. The Borrower confirms to the Bank that the
Obligations are and continue to be secured by the security interest granted by
the Borrower in favor of the Bank under the Security Documents, and all of the
terms, conditions, provisions, agreements, requirements, promises, obligations,
duties, covenants and representations of the Borrower under such documents and
any and all other documents and agreements entered into with respect to the
obligations under the Credit Agreement are incorporated herein by reference and
are hereby ratified and affirmed in all respects by the Borrower.

         Section 7. Merger and Integration, Superseding Effect. This Amendment,
from and after the date hereof, embodies the entire agreement and understanding
between the parties hereto and supersedes and has merged into this Amendment all
prior oral and written agreements

                                       3
<PAGE>

on the same subjects by and between the parties hereto with the effect that this
Amendment, shall control with respect to the specific subjects hereof and
thereof.

         Section 8. Severability. Whenever possible, each provision of this
Amendment and the other Amendment Documents and any other statement, instrument
or transaction contemplated hereby or thereby or relating hereto or thereto
shall be interpreted in such manner as to be effective, valid and enforceable
under the applicable law of any jurisdiction, but, if any provision of this
Amendment, the other Amendment Documents or any other statement, instrument or
transaction contemplated hereby or thereby or relating hereto or thereto shall
be held to be prohibited, invalid or unenforceable under the applicable law,
such provision shall be ineffective in such jurisdiction only to the extent of
such prohibition, invalidity or unenforceability, without invalidating or
rendering unenforceable the remainder of such provision or the remaining
provisions of this Amendment, the other Amendment Documents or any other
statement, instrument or transaction contemplated hereby or thereby or relating
hereto or thereto in such jurisdiction, or affecting the effectiveness, validity
or enforceability of such provision in any other jurisdiction.

         Section 9. Successors. The Amendment Documents shall be binding upon
the Borrower and the Bank and their respective successors and assigns, and shall
inure to the benefit of the Borrower and the Bank and the successors and assigns
of the Bank.

         Section 10. Legal Expenses. As provided in Section 8.2 of the Credit
Agreement, the Borrower agrees to reimburse the Bank, upon execution of this
Amendment, for all reasonable out-of-pocket expenses (including attorneys' fees
and legal expenses of Dorsey & Whitney LLP, counsel for the Bank) incurred in
connection with the Credit Agreement, including in connection with the
negotiation, preparation and execution of the Amendment Documents and all other
documents negotiated, prepared and executed in connection with the Amendment
Documents, and in enforcing the obligations of the Borrower under the Amendment
Documents, and to pay and save the Bank harmless from all liability for, any
stamp or other taxes which may be payable with respect to the execution or
delivery of the Amendment Documents, which obligations of the Borrower shall
survive any termination of the Credit Agreement.

         Section 11. Headings. The headings of various sections of this
Amendment have been inserted for reference only and shall not be deemed to be a
part of this Amendment.

         Section 12. Counterparts. The Amendment Documents may be executed in
several counterparts as deemed necessary or convenient, each of which, when so
executed, shall be deemed an original, provided that all such counterparts shall
be regarded as one and the same document, and either party to the Amendment
Documents may execute any such agreement by executing a counterpart of such
agreement.

         Section 13. Governing Law. THE AMENDMENT DOCUMENTS SHALL BE GOVERNED BY
THE INTERNAL LAWS OF THE STATE OF MINNESOTA, WITHOUT GIVING EFFECT TO CONFLICT
OF LAW PRINCIPLES THEREOF, BUT GIVING EFFECT TO FEDERAL LAWS APPLICABLE TO
NATIONAL BANKS, THEIR HOLDING COMPANIES AND THEIR AFFILIATES.

                                       4
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed as of the date and year first above written.

BORROWER:                   RTW, INC.

                            By:      /s/ Jeffrey B. Murphy
                                ------------------------------------------------

                            Title:   Chief Financial Officer
                                   ---------------------------------------------

BANK:                       U.S. BANK NATIONAL ASSOCIATION

                            By:      /s/ Christine J. Geer
                                ------------------------------------------------

                            Title:   Corporate Banking Officer
                                   ---------------------------------------------

                       [Signature Page to Sixth Amendment]

<PAGE>

                                                                    EXHIBIT A TO
                                                              SIXTH AMENDMENT TO
                                                                CREDIT AGREEMENT

                                                               EXHIBIT 1.1(B) TO
                                                                CREDIT AGREEMENT

                      FOURTH AMENDED AND RESTATED TERM NOTE

$1,000,000                                                        March 25, 2003
                                                          Minneapolis, Minnesota

         FOR VALUE RECEIVED, RTW, INC., a corporation organized under the laws
         of the State of Minnesota, hereby promises to pay to the order of U.S.
         BANK NATIONAL ASSOCIATION (the "Bank") at its main office in
         Minneapolis, Minnesota, in lawful money of the United States of America
         in Immediately Available Funds (as such term and each other capitalized
         term used herein are defined in the Credit Agreement hereinafter
         referred to) on the Term Maturity Date, the principal amount of ONE
         MILLION AND NO/100 DOLLARS ($1,000,000), and to pay interest (computed
         on the basis of actual days elapsed and a year of 360 days) in like
         funds on the unpaid principal amount hereof from time to time
         outstanding at the rates and times set forth in the Credit Agreement.

         The principal of this note shall be payable in installments in the
         following amounts on the following dates:

<TABLE>
<CAPTION>
                  ----------------------------------------- --------------------------------------
                  Date                                      Installment
                  ----------------------------------------- --------------------------------------
                  <S>                                       <C>
                  June 30, 2003                             $250,000
                  ----------------------------------------- --------------------------------------
                  September 30, 2003                        $350,000
                  ----------------------------------------- --------------------------------------
                  December 31, 2003                         $400,000
                  ----------------------------------------- --------------------------------------
                  Term Maturity Date                        All remaining principal, plus
                                                            accrued and unpaid interest
                  ----------------------------------------- --------------------------------------
</TABLE>

         This note is the Term Note referred to in the Credit Agreement dated as
         of March 31, 2000 (as the same has been and may hereafter be from time
         to time amended, restated or otherwise modified, the "Credit
         Agreement") between the undersigned and the Bank. This note is secured
         and its maturity is subject to acceleration, in each case upon the
         terms provided in said Credit Agreement.

         This note amends and restates in its entirety an existing promissory
         note dated March 22, 2002 in the original principal amount of
         $3,500,000 issued by RTW, Inc. to the order of the Bank (the "Prior
         Note"). It is expressly intended, understood and agreed that all

<PAGE>

         amounts outstanding under said Prior Note as of the date hereof shall
         be considered outstanding hereunder from and after the date hereof and
         shall not be considered paid (nor shall the undersigned's obligation to
         pay the same be considered discharged or satisfied) as a result of the
         issuance of this note.

         In the event of default hereunder, the undersigned agrees to pay all
         costs and expenses of collection, including reasonable attorneys' fees.
         The undersigned waives demand, presentment, notice of nonpayment,
         protest, notice of protest and notice of dishonor.

         THE VALIDITY, CONSTRUCTION AND ENFORCEABILITY OF THIS NOTE SHALL BE
         GOVERNED BY THE INTERNAL LAWS OF THE STATE OF MINNESOTA WITHOUT GIVING
         EFFECT TO THE CONFLICT OF LAWS PRINCIPLES THEREOF, BUT GIVING EFFECT TO
         FEDERAL LAWS OF THE UNITED STATES APPLICABLE TO NATIONAL BANKS.

                             RTW, INC.

                             By       /s/ Jeffrey B. Murphy
                                 -------------------------------------------
                             Title    Chief Financial Officer
                                    ----------------------------------------<PAGE>
                                                                   EXHIBIT 10.30

                        RESIGNATION AGREEMENT AND RELEASE

         This Resignation Agreement and Release ("Agreement") is made and
entered into as of December 4, 2002 between Radiologix, Inc., a Delaware
corporation ("Radiologix"), and Mark L. Wagar ("Wagar"), an individual residing
in the State of Texas.

                                     RECITAL

         The parties desire to set forth all matters regarding Wagar's
resignation from Radiologix, including matters relating to benefits,
compensation, stock options, Wagar's Employment Agreement entered into between
Wagar and American Physician Partners, Inc. (now known as Radiologix) on May 28,
1998, as amended on January 1, 1999, July 1, 2000, and February 11, 2002 (the
"Employment Agreement"), and Wagar's assistance with Radiologix's transition to
a new Chief Executive Officer.

                                    AGREEMENT

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

         1. TERMINATION OF DUTIES. Effective December 4, 2002 Wagar resigns as
Radiologix's Chairman of the Board of Directors. Effective upon the earlier of
May 31, 2003 or the first date of employment of Radiologix's new Chief Executive
Officer (the "Separation Date"), Wagar resigns from all director and officer
positions with Radiologix and its affiliates, including as Chief Executive
Officer of Radiologix. Effective upon the Separation Date, the obligations and
responsibilities of the parties set forth in the Employment Agreement shall
completely terminate, except as provided in this Agreement.

         2. TRANSITION OF JOB DUTIES. After the Separation Date, Wagar agrees
that he will assist in the transition of his job duties in a diligent,
trustworthy and business-like manner. After the termination of the Consulting
Agreement dated the date hereof between Radiologix and Wagar (the "Consulting
Agreement"), Wagar also agrees that, even after his job duties have been
successfully transitioned, he will continue to provide information and
assistance to Radiologix upon its reasonable request for a total of ten days.
Wagar shall not be compensated for the first five days of assistance. Radiologix
shall compensate him as an independent contractor for the next five days of
assistance at the rate of $1,000 per day for in-person meetings and $500 per day
for meetings held by telephone (other than routine telephone calls). This
assistance includes cooperating with Radiologix in any litigation or
administrative proceedings involving any matters with which he was involved
during his employment with Radiologix. Radiologix shall reimburse Wagar for all
reasonable, documented out-of-pocket expenses he shall incur in complying with
this Section 2.

         3. WAGAR'S COMPENSATION UNTIL MAY 31, 2003. Wagar shall continue to
receive his salary in accordance with Radiologix's regular salary payment
schedule through May 31, 2003, regardless of whether Wagar's last date of
employment is May 31, 2003 or earlier. Wagar shall continue to receive his
normal benefits through his Separation Date; provided, however, that in the
event Wagar's Separation Date is prior to May 31, 2003 and Wagar elects to
continue his group health benefits in accordance with the Consolidated Omnibus
Budget Reconciliation Act of 1985, as amended ("COBRA"), Radiologix shall pay
the portion of any premiums relating to such COBRA continuation coverage that
Radiologix would otherwise pay if Wagar was an active employee through May 31,
2003. Except as otherwise provided in Section 4 of this Agreement, continuation
of Wagar's normal benefits that are not group health benefits shall be offered
past his Separation Date and through May 31, 2003 to the extent continuation of
any such benefit is permitted by the terms and conditions of the applicable
benefit plan or policy. After May 31, 2003, all benefits and perquisites related
to Wagar's employment with Radiologix shall cease, and no further salary, bonus,
benefits, payments, or options shall be due from or paid by Radiologix to Wagar,
except as required in this Agreement or otherwise required by COBRA. Wagar
hereby waives and relinquishes all claims to further employment, compensation,
benefits, options, or any other type of remuneration from Radiologix, except as
expressly required in this Agreement.

         4. 401 (k) BENEFITS. After the Separation Date, Wagar shall cease
active participation in any retirement benefits offered by Radiologix and shall
not be entitled to make or receive any further contributions with respect to
such retirement benefits for any period of time after the Separation Date. After
the Separation Date, Radiologix shall provide Wagar, under separate cover and in
accordance with Radiologix's standard procedure, the information necessary and
as required by law regarding a distribution and rollover of any vested interest
held by Wagar in Radiologix's 401(k) or other retirement plans. Any nonvested
interest held by Wagar in Radiologix's 401(k) or other retirement plans shall be
forfeited as of the Separation Date.

         5. RETURN OF PROPERTY. Before the Separation Date, Wagar shall return
all equipment and property in his possession which belongs to Radiologix,
including all files and programs stored electronically or otherwise, that relate
or refer to Radiologix, all

<PAGE>
original and copies of documents, notes, memoranda or any other written
materials that relate or refer to Radiologix, and material that constitutes
"Confidential Information" as defined in the Confidentiality Agreement (as
defined in Section 13 of this Agreement). In addition, Wagar agrees to permit
Radiologix to electronically examine all computer equipment that he may have
used in the course of performing his job duties.

         6. CONSIDERATION. As additional consideration for the release and
covenants by Wagar set forth in this Agreement, Radiologix shall make the
payments to Wagar described in this Section. Upon execution of this Agreement,
Radiologix shall pay Wagar the sum of One Hundred Twenty-one Thousand Eight
Hundred Seventy and 19/100 Dollars ($121,870.19) payable as wages, less required
state and federal deductions and any other payroll deductions requested by
Wagar. On January 2, 2003, Radiologix shall pay Wagar the sum of Ninety-nine
Thousand One Hundred Twenty-nine and 81/100 Dollars ($99,129.81) payable as
wages, less required state and federal deductions and any other payroll
deductions requested by Wagar. Upon execution by Wagar of releases and covenants
on the Separation Date substantially similar to those contained herein,
Radiologix agrees to pay Wagar on the Separation Date the sum of Two Hundred
Twenty-one Thousand Dollars ($221,000.00) payable as wages, less required state
and federal deductions and any other payroll deductions requested by Wagar.
Wagar hereby agrees that he is solely responsible for employee tax obligations,
if any, including, but not limited to, all reporting and payment obligations,
which may arise as a consequence of such payment. Wagar hereby agrees to hold
Radiologix and the Released Parties (as defined in Section 9 of this Agreement)
harmless from and against, and agrees to reimburse and indemnify Radiologix and
the Released Parties for, any taxes, penalties, net loss, cost, damage or
expense, including, without limitation, attorneys fees, incurred by Radiologix
or the Released Parties arising out of the tax treatment by Wagar on his tax
return(s) of any payments made to Wagar pursuant to this Agreement, and/or
arising out of Radiologix's payments to Wagar.

         7. STOCK OPTIONS. As further consideration to Wagar, Radiologix agrees
that Wagar shall have until December 31, 2003 to exercise the stock options
granted to him by Radiologix in which he was vested at the Separation Date. The
Parties agree that, after December 31, 2003, all unexercised stock options
granted to Wagar shall be null and void and of no further effect. Wagar agrees
that all options which have not vested by the Separation Date will be forfeited
as of that date.

         8. ACCRUED VACATION. On the Separation Date, Radiologix shall pay Wagar
for all his accrued, unused vacation pursuant to Radiologix's standard policy.

         9. WAGAR'S RELEASE. In consideration of the promises, covenants and
other valuable consideration provided by Radiologix in this Agreement, and to
fully compromise and settle any and all claims and causes of action of any kind
whatsoever except as provided in this Agreement and the Consulting Agreement,
Wagar hereby unconditionally releases and discharges Radiologix and its current
and former employees, officers, agents, directors, shareholders and affiliates
and Radiologix's contracted radiology practices and their respective current and
former employees, officers, agents, directors, shareholders and affiliates
(collectively referred to as "Released Parties") from any and all claims, causes
of action, losses, obligations, liabilities, damages, judgments, costs, expenses
(including attorneys' fees) of any nature whatsoever, known or unknown,
contingent or non-contingent (collectively, "Claims"), that Wagar has as of the
date of this Agreement, including, but not limited to, those arising (i) out of
Wagar's hiring, employment, termination of employment with Radiologix or the
Employment Agreement and (ii) under federal or state law, including, but not
limited to, the Age Discrimination in Employment Act of 1967, 42 U.S.C. Sections
1981-1988, Title VII of the Civil Rights Act of 1964, the Equal Pay Act, the
Employee Retirement Income Security Act of 1974, the Consolidated Omnibus Budget
Reconciliation Act, the National Labor Relations Act, the Occupational Safety
and Health Act, the Fair Labor Standards Act, the Family and Medical Leave Act
of 1993, the Workers Adjustment and Retraining Act, the Americans with
Disabilities Act of 1990, the Texas Labor Code, the Texas Commission on Human
Rights Act, the Texas Payday Act, Chapter 38 of the Texas Civil Practices and
Remedies Code, and any provision of the state or federal Constitutions or Texas
common law. This release includes but is not limited to any claims Wagar may
have for salary, wages, severance pay, vacation pay, sick pay, bonuses,
benefits, pension, stock options, overtime, and any other compensation or
benefit of any nature. This Release also includes but is not limited to all
common law claims including but not limited to claims for wrongful discharge,
breach of express or implied contract, implied covenant of good faith and fair
dealing, intentional infliction of emotional distress, defamation, conspiracy,
invasion of privacy, and/or tortious interference with current or prospective
business relationships. Furthermore, Wagar agrees and hereby relinquishes any
right to re-employment with Radiologix or the Released Parties. Wagar also
relinquishes any right to further payment or benefits under any employment
agreement, benefit plan or severance arrangement maintained or previously or
subsequently maintained by Radiologix or any of the Released Parties or any of
its respective predecessors or successors, except as expressly required in this
Agreement. However, Wagar does not release his right to enforce the terms of
this Agreement or the Consulting Agreement.

         10. RADIOLOGIX'S RELEASE. Radiologix hereby unconditionally releases
and discharges Wagar from any and all Claims (as defined in Section 9) that
Radiologix has as of the date of this Agreement, so long as he acted in good
faith and in the best interests of Radiologix and his conduct was not unlawful
or illegal. However, Radiologix does not release its right to enforce the terms
of this Agreement, the Consulting Agreement or the Confidentiality Agreement (as
defined in Section 13 below).

<PAGE>
         11. NO CLAIMS AGAINST RELEASED PARTIES. Wagar warrants and represents
that he will not bring any claim or lawsuit against, or file any charge,
complaint or claim with any local, state or federal agency against, Radiologix
or any of the Released Parties related to any matters released by Wagar under
Section 9 of this Agreement. Wagar agrees that if he brings or asserts any such
action or lawsuit, he shall pay all costs and expenses, including reasonable
attorneys' fees, incurred by Radiologix or the Released Parties in defending the
action or lawsuit. Nothing in this provision, however, shall be interpreted to
prevent Wagar from bringing a claim or lawsuit to enforce the terms of this
Agreement or the Consulting Agreement.

         12. NO CLAIMS AGAINST WAGAR. Radiologix warrants and represents that it
will not bring any claim or lawsuit against, or file any charge, complaint or
claim with any local, state or federal agency against, Wagar related to any
matters released by Radiologix under Section 10 of this Agreement. Radiologix
agrees that if it brings or asserts any such action or lawsuit, it shall pay all
costs and expenses, including reasonable attorneys' fees, incurred by Wagar in
defending the action or lawsuit. Nothing in this provision, however, shall be
interpreted to prevent Radiologix from bringing a claim or lawsuit to enforce
the terms of this Agreement or the Consulting Agreement.

         13. CONFIDENTIAL INFORMATION. Wagar agrees that the Confidentiality,
Proprietary Information and Inventions Agreement (the "Confidentiality
Agreement") he executed in connection with the Employment Agreement shall remain
in full force and effect.

         14. NON-DISPARAGEMENT. Wagar agrees that he will not criticize, defame
or disparage Radiologix or the Released Parties, their plans, or their actions
to any third party, either orally or in writing. Radiologix agrees that it will
not, and it will use its reasonable efforts to cause the Released Parties to
not, criticize, defame or disparage Wagar, his plans, or his actions to any
third party, either orally or in writing.

         15. NON-COMPETITION AND NO SOLICITATION. The parties agree that Wagar's
obligations in Section 5.2(c)(i) through 5.2(c)(iii) of his Employment Agreement
remain in full force and effect and that the one-year period referred to therein
shall begin on the later of the termination of this Agreement or the termination
of the Consulting Agreement. The parties agree that these obligations were
included in the Employment Agreement because of the Confidential Information and
specialized training that Wagar received from Radiologix during his employment.
In addition, the parties agree that in the continued performance of his duties
under this Agreement and the Consulting Agreement, Radiologix promises to supply
him, and he will obtain, Confidential Information. The parties also agree that,
in the event any court of competent jurisdiction holds that any of the
obligations or restrictions in Section 5.2(c)(i) through 5.2(c)(iii) of the
Employment Agreement are unreasonable and/or unenforceable as written, the court
may reform the obligations or restrictions to make them enforceable, and the
obligations and restrictions shall remain in full force and effect as reformed
by the court. Finally, the parties agree that any period or periods of Wagar's
breach of these obligations will not count towards the one-year period, but
shall instead be added to the one-year period.

         16. WAGAR'S DEATH. In the event of Wagar's death, this Agreement shall
operate in favor of his estate ("Estate") and all payments, obligations and
consideration as contemplated hereby shall continue to be performed in favor of
his Estate.

         17. RADIOLOGIX'S DEFAULT IN PAYMENT. Should Radiologix default in
timely payment on the due date of any payment or amount due under this
Agreement, Wagar shall give written notice of such default to the persons
specified in or pursuant to this Agreement to receive notice on behalf of
Radiologix. Radiologix shall have ten calendar days after the receipt of such a
notice of default to cure any payment default.

         18. BREACH OF THIS AGREEMENT. If a court of competent jurisdiction
determines that either party has breached or failed to perform any part of this
Agreement, the parties agree that the non-breaching party shall be entitled to
injunctive relief to enforce the Agreement and that the breaching party shall be
responsible for paying the non-breaching party's costs and attorneys' fees
incurred in enforcing the Agreement. This Section does not apply to any claims
Wagar may have regarding the Age Discrimination in Employment Act.

         19. SEVERABILITY. Should any of the provisions of this Agreement be
rendered invalid by a court or government agency of competent jurisdiction, or
should Wagar fail to fulfill his obligations under it, the remainder of this
Agreement shall, to the fullest extent permitted by applicable law and at
Radiologix's option, remain in full force and effect and/or the Consulting
Agreement shall be null and void.

         20. ORDERLY TRANSITION AND DOCUMENTATION. Radiologix and Wagar are
willing to enter into this Agreement to insure an orderly transition of Wagar's
job duties and to document all matters regarding Wagar's resignation from
Radiologix, including matters relating to benefits, compensation, stock options,
the Employment Agreement, and the transition to a new Chief Executive Officer.
By entering into this Agreement, neither party is accusing the other of
wrongdoing. This Agreement shall not in any way be construed as an admission by
either party of any acts of wrongdoing, violation of any statute, law or legal
or contractual right.

<PAGE>
         21. AMBIGUITIES IN THE AGREEMENT. The parties acknowledge that this
Agreement has been drafted, prepared, negotiated and agreed to jointly, with
advice of each party's respective counsel, and to the extent that any ambiguity
should appear, now or at any time in the future, latent or apparent, such
ambiguity shall not be resolved or construed against either party.

         22. CONFIDENTIALITY. Except as required by law, each of the parties
agrees to keep confidential the specific terms of this Agreement, and shall not
disclose the terms of this Agreement to any person except the financial, tax and
legal advisors of Wagar and Radiologix (and the Board of Directors of
Radiologix). This Agreement may be disclosed in, or filed as an exhibit to, any
filing required under any securities laws to be made by Radiologix.

         23. NOTICES. All notices and other communications hereunder will be in
writing. Any notice or other communication hereunder shall be deemed duly given
if it is sent by registered or certified mail, return receipt requested, postage
prepaid, and addressed to the intended recipient as set forth:

         If to Wagar:

                  Mr. Mark L. Wagar
                  17 Windsor Ridge
                  Frisco, Texas 75034

         With copy to:

                  Andrew Trusevich
                  Quilling Selander Cummiskey & Lownds, P.C.
                  2001 Bryan Street, Suite 1800
                  Dallas, Texas 75201

         If to Radiologix:

                  Chairman of the Board
                  Radiologix, Inc.
                  2200 Ross Avenue
                  Suite 3600
                  Dallas, Texas 75201

         With copy to:

                  Paul M. Jolas, Executive Vice President and General Counsel
                  Radiologix, Inc.
                  2200 Ross Avenue
                  Suite 3600
                  Dallas, Texas 75201

Any party may send any notice or other communication hereunder to the intended
recipient at the address set forth using any other means (including personal
delivery, expedited courier, messenger services, telecopy (sent to Radiologix at
214-303-2777), telex, ordinary mail or electronic mail), but no such notice or
other communication shall be deemed to have been duly given unless and until it
is actually received by the intended recipient. Any party may change the address
to which notices and other communications hereunder are to be delivered by
giving the other Party notice in the manner set forth herein.

         24. COUNTERPART AGREEMENTS. This Agreement may be executed in multiple
counterparts, whether or not all signatories appear on these counterparts, and
each counterpart shall be deemed an original for all purposes.

         25. CHOICE OF LAW. This Agreement shall be deemed performable by all
parties in, and venue shall be in the state or federal courts located in, Dallas
County, Texas and the construction and enforcement of this Agreement shall be
governed by Texas law without regard to its conflicts of law rules.

         26. NO ASSIGNMENT OF CLAIMS. Wagar represents and warrants that he has
not transferred or assigned to any person or entity any claim involving
Radiologix or the Released Parties or any portion thereof or interest therein.

<PAGE>
         27. ENTIRE AGREEMENT. This Agreement sets forth the entire agreement
between the Parties, and fully supersedes any and all prior agreements,
understandings, or representations between the Parties pertaining to the subject
matter of this Agreement.

         28. BINDING EFFECT OF AGREEMENT. This Agreement shall be binding upon
Wagar, Radiologix and their heirs, administrators, representatives, executors,
successors, and assigns.

         29. OTHER COVENANTS OF WAGAR. Wagar agrees to notify Radiologix
promptly if he accepts any employment or consulting arrangement with any other
person or entity. If Wagar resigns his positions with Radiologix prior to the
Separation Date or accepts a full-time position with another person or entity
prior to the Separation Date (in each case, an "Early Termination"), (i)
Radiologix shall not be required to (a) pay his salary pursuant to Section 3
after the date of Early Termination, (b) pay the $221,000 payment due him on the
Separation Date, and (c) extend Wagar's stock option vesting and exercise
periods described in Section 7, and (ii) the Consulting Agreement shall be null
and void.

         30. TIME TO SIGN AND RETURN AGREEMENT. Wagar acknowledges and agrees
that he first received the original of this Agreement on or before November 29,
2002. Wagar also understands and agrees that he has been given at least 21
calendar days from the date he first received this Agreement to obtain the
advice and counsel of the legal representative of his choice and to decide
whether to sign it. Wagar further agrees that changes to the terms or form of
this Agreement, whether material or immaterial, do not restart the running of
this 21-day period. Wagar understands that he may sign the Agreement at any time
on or before the expiration of this 21-day period. Wagar also understands that
for seven calendar days after he signs this Agreement he has the right to revoke
it, and that this Agreement will not become effective and enforceable until
after the expiration of this seven-day period. However, Wagar specifically
understands and agrees that any attempt by him to revoke this Agreement after
the seven-day period has expired is, or will be, ineffective. Wagar represents
and agrees that he has thoroughly discussed all aspects of this Agreement and
the effect of same with his attorney, that he has had a reasonable time to
review the Agreement, that he fully understands all the provisions of the
Agreement and that he is voluntarily entering into this Agreement. By signing
this Agreement, Wagar acknowledges the following:

I ACKNOWLEDGE THAT I HAVE CAREFULLY READ THE FOREGOING AGREEMENT, THAT I
UNDERSTAND ALL OF ITS TERMS, AND THAT I AM ENTERING INTO IT VOLUNTARILY.

I FURTHER ACKNOWLEDGE THAT I AM AWARE OF MY RIGHTS TO REVIEW AND CONSIDER THIS
AGREEMENT FOR 21 DAYS AND TO CONSULT WITH AN ATTORNEY ABOUT IT, AND STATE THAT
BEFORE SIGNING THIS AGREEMENT, I HAVE EXERCISED THESE RIGHTS TO THE FULL EXTENT
THAT I DESIRED.

Executed as of December 4, 2002.

/s/ Mark L. Wagar
---------------------------------------------------
MARK L. WAGAR

RADIOLOGIX, INC.

By:  /s/ Paul M. Jolas
    -----------------------------------------------
    Title:  Exec. VP, General Counsel and Secretary

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