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                                                                   EXHIBIT 10.37

                   AMENDMENT NUMBER 4 TO EMPLOYMENT AGREEMENT

         THIS AMENDMENT NUMBER 4 TO EMPLOYMENT AGREEMENT, effective as of
February 11, 2002, is by and between Radiologix, Inc., a Delaware corporation
(the "Company"), and Mark S. Martin ("Martin").

         WHEREAS, the Company and Martin entered into an Employment Agreement
dated as of June 12, 1996, which was amended effective January 1, 1999, February
9, 2000, and July 1, 2000 (as amended, the "Employment Agreement"); and

         WHEREAS, the Company and Martin desire to further amend the Employment
Agreement to reflect an increase in Martin's base salary and to make certain
other amendments;

         NOW, THEREFORE, in consideration of the mutual covenants and conditions
set forth herein, the parties hereby agree as follows:

         1.       Section 3.1 of the Employment Agreement is hereby deleted in
its entirety and replaced with the following new Section 3.1:

                  Section 3.1 SALARY. For the performance of Martin's duties
         hereunder, the Company shall pay Martin an annual salary of $338,000,
         in equal periodic installments (less required withholdings) no less
         frequently than every two weeks.

         2.       The second sentence of Section 4 of the Employment Agreement
is hereby deleted in its entirety and replaced with the following new second
sentence:

         In addition, notwithstanding the provisions of Section 5.2(b), if the
         Company terminates Martin's employment hereunder at any time following
         a Change of Control, then immediately upon such termination of
         employment, the Company shall pay Martin, in addition to the amounts
         required under Section 5.2(a), a lump sum severance payment in an
         amount equal to the sum of (i) the product of Martin's then current
         annual salary for one year multiplied by two plus (ii) the product of
         Martin's most recent annual bonus payment received for the fiscal year
         immediately preceding the Change of Control multiplied by two. In
         addition, the Company shall continue to provide Martin with the
         benefits described in Section 3.4 until the earlier of (i) the two-year
         anniversary of the date of Martin's termination of employment and (ii)
         the date on which Martin obtains substantially equivalent benefits from
         another party.

         3.       Section 5.2(b) of the Employment Agreement is hereby deleted
in its entirety and replaced with the following new Section 3.1:

                  (b) In addition, if Martin's employment is terminated under
         Sections 5.1(b), (d) or (e), then the Company shall also pay Martin,
         immediately upon such termination of employment, a lump sum severance
         payment in an amount equal to Martin's then current annual salary.

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         IN WITNESS WHEREOF, the parties have executed this Amendment Number 4
to Employment Agreement effective as of the date first written above.

                                  RADIOLOGIX, INC.

                                  By:
                                      ------------------------------------------
                                      Paul M. Jolas
                                      General Counsel, Executive Vice President,
                                        and Secretary

                                  MARTIN:

                                  ----------------------------------------------
                                      Mark S. Martin

                                       2<PAGE>
                                                                   EXHIBIT 10.38

                   AMENDMENT NUMBER 1 TO EMPLOYMENT AGREEMENT

         THIS AMENDMENT NUMBER 1 TO EMPLOYMENT AGREEMENT, effective as of
February 11, 2002, is by and between Radiologix, Inc., a Delaware corporation
(the "Company"), and Sami S. Abbasi ("Abbasi").

         WHEREAS, the Company and Abbasi entered into an Employment Agreement
dated as of December 13, 2000 (the "Employment Agreement"); and

         WHEREAS, the Company and Abbasi desire to amend the Employment
Agreement to reflect an increase in Abbasi's base salary and to make certain
other amendments;

         NOW, THEREFORE, in consideration of the mutual covenants and conditions
set forth herein, the parties hereby agree as follows:

         1.  Section 3.1 of the Employment Agreement is hereby deleted in its
entirety and replaced with the following new Section 3.1:

             Section 3.1 SALARY. For the performance of Abbasi's duties
         hereunder, the Company shall pay Abbasi an annual salary of $286,000,
         in equal periodic installments (less required withholdings) no less
         frequently than every two weeks.

         2.  The second sentence of Section 4 of the Employment Agreement is
hereby deleted in its entirety and replaced with the following new second
sentence:

         In addition, notwithstanding the provisions of Section 5.2(b), if the
         Company terminates Abbasi's employment hereunder at any time following
         a Change of Control, then immediately upon such termination of
         employment, the Company shall pay Abbasi, in addition to the amounts
         required under Section 5.2(a), a lump sum severance payment in an
         amount equal to the sum of (i) the product of Abbasi's then current
         annual salary for one year multiplied by two plus (ii) the product of
         Abbasi's most recent annual bonus payment received for the fiscal year
         immediately preceding the Change of Control multiplied by two. In
         addition, the Company shall continue to provide Abbasi with the
         benefits described in Section 3.4 until the earlier of (i) the two-year
         anniversary of the date of Abbasi's termination of employment and (ii)
         the date on which Abbasi obtains substantially equivalent benefits from
         another party.

         3.  Section 5.2(b) of the Employment Agreement is hereby deleted in its
entirety and replaced with the following new Section 3.1:

             (b) In addition, if Abbasi's employment is terminated under
         Sections 5.1(b), (d) or (e), then the Company shall also pay Abbasi,
         immediately upon such termination of employment, a lump sum severance
         payment in an amount equal to Abbasi's then current annual salary.

                                       1
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         IN WITNESS WHEREOF, the parties have executed this Amendment Number 1
to Employment Agreement effective as of the date first written above.

                                  RADIOLOGIX, INC.

                                  By:
                                      -----------------------------------------
                                      Paul M. Jolas
                                      General Counsel, Executive Vice President,
                                        and Secretary

                                  ABBASI:

                                      -----------------------------------------
                                      Sami S. Abbasi

                                       2<PAGE>
                                                                   EXHIBIT 10.39

                   AMENDMENT NUMBER 4 TO EMPLOYMENT AGREEMENT

         THIS AMENDMENT NUMBER 4 TO EMPLOYMENT AGREEMENT, effective as of
February 11, 2002, is by and between Radiologix, Inc., a Delaware corporation
(the "Company"), and Paul M. Jolas ("Jolas").

         WHEREAS, the Company and Jolas entered into an Employment Agreement
dated as of July 31, 1996, which was amended effective January 1, 1999, July 1,
2000, and March 1, 2001 (as amended, the "Employment Agreement"); and

         WHEREAS, the Company and Jolas desire to further amend the Employment
Agreement to reflect an increase in Jolas' base salary and to make certain other
amendments;

         NOW, THEREFORE, in consideration of the mutual covenants and conditions
set forth herein, the parties hereby agree as follows:

         1.       Section 3.1 of the Employment Agreement is hereby deleted in
its entirety and replaced with the following new Section 3.1:

                  Section 3.1 SALARY. For the performance of Jolas' duties
         hereunder, the Company shall pay Jolas an annual salary of $229,500, in
         equal periodic installments (less required withholdings) no less
         frequently than every two weeks.

         2.       The second sentence of Section 4 of the Employment Agreement
is hereby deleted in its entirety and replaced with the following new second
sentence:

         In addition, notwithstanding the provisions of Section 5.2(b), if the
         Company terminates Jolas' employment hereunder at any time following a
         Change of Control, then immediately upon such termination of
         employment, the Company shall pay Jolas, in addition to the amounts
         required under Section 5.2(a), a lump sum severance payment in an
         amount equal to the sum of (i) the product of Jolas' then current
         annual salary for one year multiplied by two plus (ii) the product of
         Jolas' most recent annual bonus payment received for the fiscal year
         immediately preceding the Change of Control multiplied by two. In
         addition, the Company shall continue to provide Jolas with the benefits
         described in Section 3.4 until the earlier of (i) the two-year
         anniversary of the date of Jolas' termination of employment and (ii)
         the date on which Jolas obtains substantially equivalent benefits from
         another party.

         3.       Section 5.2(b) of the Employment Agreement is hereby deleted
in its entirety and replaced with
the following new Section 3.1:

                  (b) In addition, if Jolas' employment is terminated under
         Sections 5.1(b), (d) or (e), then the Company shall also pay Jolas,
         immediately upon such termination of employment, a lump sum severance
         payment in an amount equal to Jolas' then current annual salary.

                                      1

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         IN WITNESS WHEREOF, the parties have executed this Amendment Number 4
to Employment Agreement effective as of the date first written above.

                                         RADIOLOGIX, INC.

                                         By:
                                             --------------------------------
                                             Mark L. Wagar
                                             Chairman of the Board and
                                               Chief Executive Officer

                                         JOLAS:

                                         ------------------------------------
                                             Paul M. Jolas

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