AMERICAN SHARED HOSPITAL SERVICES
10-K/A, 1999-03-31
MEDICAL LABORATORIES
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<PAGE>   1
 
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            -----------------------
   
                               AMENDMENT NO. 1 TO
        
                                  FORM 10-K
 
(MARK ONE)
 
      [X]   ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
        SECURITIES EXCHANGE ACT OF 1934
 
                  FOR THE FISCAL YEAR ENDED DECEMBER 31, 1998
 
                                       OR
 
      [ ]   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
        SECURITIES EXCHANGE ACT OF 1934
 
         FOR THE TRANSITION PERIOD FROM ____________ TO ____________ .
 
                         COMMISSION FILE NUMBER 1-8789
                            ------------------------
 
                       AMERICAN SHARED HOSPITAL SERVICES
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                                            <C>
                  CALIFORNIA                                     94-2918118
       (STATE OR OTHER JURISDICTION OF                         (IRS EMPLOYER
        INCORPORATION OR ORGANIZATION)                      IDENTIFICATION NO.)
</TABLE>
 
    FOUR EMBARCADERO CENTER, SUITE 3620, SAN FRANCISCO, CALIFORNIA     94111
               (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES) (ZIP CODE)
 
       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (415) 788-5300
 
          SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT:
 
<TABLE>
<CAPTION>
       TITLE OF EACH CLASS             NAME OF EACH EXCHANGE ON WHICH REGISTERED
       -------------------             -----------------------------------------
<S>                                 <C>
    COMMON STOCK NO PAR VALUE           AMERICAN STOCK EXCHANGE PACIFIC EXCHANGE
</TABLE>
 
        SECURITIES REGISTERED PURSUANT TO SECTION 12(G) OF THE ACT: NONE
 
     Indicate by check mark whether the registrant: (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.  Yes [X]  No [ ]
 
     Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K.  [ ]
 
     As of March 15, 1999, the aggregate market value of the common stock held
by non-affiliates of the registrant was approximately $3,286,054.
 
     Number of shares of common stock of the registrant outstanding as of March
15, 1999: 3,972,372.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
     Portions of the registrant's definitive Proxy Statement for the 1999 Annual
Meeting of its shareholders are incorporated by reference into Part III of this
report.
 
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<PAGE>   2
 
                                   SIGNATURES
 
     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.
 
                                          AMERICAN SHARED HOSPITAL SERVICES
                                          (Registrant)
 
March 29, 1999                            By:      /s/ ERNEST A. BATES
                                            ------------------------------------
                                                      Ernest A. Bates
                                                        Chairman and
                                                  Chief Executive Officer
 
     Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on behalf of the
registrant in the capacities and on the dates indicated.
 
<TABLE>
<CAPTION>
                     SIGNATURE                                      TITLE                    DATE
                     ---------                                      -----                    ----
<C>                                                    <C>                              <S>
                /s/ ERNEST A. BATES                      Chief Executive Officer and    March 29, 1999
- ---------------------------------------------------         Chairman of the Board
                  Ernest A. Bates
 
               /s/ WILLIE R. BARNES                        Director and Secretary       March 29, 1999
- ---------------------------------------------------
                 Willie R. Barnes
 
                /s/ JOHN F. RUFFLE                                Director              March 29, 1999
- ---------------------------------------------------
                  John F. Ruffle
 
            /s/ STANLEY S. TROTMAN, JR.                           Director              March 29, 1999
- ---------------------------------------------------
              Stanley S. Trotman, Jr.
 
            /s/ AUGUSTUS A. WHITE, III                            Director              March 29, 1999
- ---------------------------------------------------
              Augustus A. White, III
 
               /s/ CHARLES B. WILSON                              Director              March 29, 1999
- ---------------------------------------------------
                 Charles B. Wilson
 
                /s/ CRAIG K. TAGAWA                      Chief Operating Officer and    March 29, 1999
- ---------------------------------------------------        Chief Financial Officer
                  Craig K. Tagawa                      (Principal Accounting Officer)
</TABLE>
 
                                       23
<PAGE>   3
 
                               INDEX TO EXHIBITS
 
<TABLE>
<CAPTION>
    EXHIBIT                                                                  SEQUENTIAL
    NUMBER                             DESCRIPTION                           PAGE NUMBER
    -------                            -----------                           -----------
    <S>        <C>                                                           <C>
     2.1       Securities Purchase Agreement, dated as of March 12, 1998,         *
               by and among Alliance Imaging, Inc.; Embarcadero Holding
               Corp. I; Embarcadero Holding Corp. II; American Shared
               Hospital Services; and MMRI, Inc.(1)........................
     3.1       Articles of Incorporation of the Company, as amended.(2)....       *
     3.2       By-laws for the Company, as amended.(3).....................       *
     4.6       Form of Common Stock Purchase Warrant of American Shared           *
               Hospital Services.(3).......................................
     4.8       Registration Rights Agreement, dated as of May 17, 1995, by        *
               and among American Shared Hospital Services, the Holders
               referred to in the Note Purchase Agreement, dated as of May
               12, 1995 and General Electric Company, acting through GE
               Medical Systems.(3).........................................
    10.1       The Company's 1984 Stock Option Plan, as amended.(5)........       *
    10.2       The Company's 1995 Stock Option Plan, as amended.(6)........       *
    10.3       Form of Indemnification Agreement between American Shared          *
               Hospital Services and members of its Board of
               Directors.(5)...............................................
    10.4       Ernest A. Bates Stock Option Agreement dated as of August          *
               15, 1995.(7)................................................
    10.5       Operating Agreement for GK Financing, LLC, dated as of             *
               October 17, 1995.(3)........................................
    10.6       Amendments dated as of October 26, 1995 and as of December         *
               20, 1995 to the GK Financing, LLC Operating Agreement, dated
               as of October 17, 1995.(4)..................................
    10.7       Amendment dated as of October 16, 1996 to the GK Financing,        *
               LLC Operating Agreement, dated as of October 17, 1995.(1)...
    10.8       Amendment dated as of March 31, 1998 ("Fourth Amendment") to
               the GK Financing, LLC Operating Agreement dated as of
               October 17, 1995............................................
    10.9       Amendment dated as of March 31, 1998 ("Fifth Amendment") to
               the GK Financing, LLC Operating Agreement dated as of
               October 17, 1995............................................
    10.10      Amendment dated as of June 5, 1998 to the GK Financing, LLC
               Operating Agreement dated as of October 17, 1995............
    10.11a     Assignment and Assumption Agreement, dated as of December
               31, 1995, between American Shared Radiosurgery Services
               (assignor) and GK Financing, LLC (assignee).................
    10.11b     Assignment and Assumption Agreement, dated as of November 1,       *
               1995, between American Shared Hospital Services (assignor)
               and American Shared Radiosurgery Services (assignee).(4)....
    10.11c     Amendment Number One dated as of August 1, 1995 to the Lease
               Agreement for a Gamma Knife Unit between The Regents of the
               University of California and American Shared Hospital
               Services. (Confidential material appearing in this document
               has been omitted and filed separately with the Securities
               and Exchange Commission in accordance with Rule 24b-2,
               promulgated under the Securities and Exchange Act of 1934,
               as amended. Omitted information has been replaced with
               asterisks.).................................................
</TABLE>
<PAGE>   4
 
<TABLE>
<CAPTION>
    EXHIBIT                                                                  SEQUENTIAL
    NUMBER                             DESCRIPTION                           PAGE NUMBER
    -------                            -----------                           -----------
    <S>        <C>                                                           <C>
    10.11d     Lease Agreement dated as of July 3, 1990 for a Gamma Knife
               Unit between American Shared Hospital Services and The
               Regents of the University of California. (Confidential
               material appearing in this document has been omitted and
               filed separately with the Securities and Exchange Commission
               in accordance with Rule 24b-2, promulgated under the
               Securities and Exchange Act of 1934, as amended. Omitted
               information has been replaced with asterisks.)..............
    10.12      Amendment Number Two dated as of February 6, 1998 to the
               Lease Agreement for a Gamma Knife Unit between UCSF-Stanford
               Health Care and GK Financing, LLC. (Confidential material
               appearing in this document has been omitted and filed
               separately with the Securities and Exchange Commission in
               accordance with Rule 24b-2, promulgated under the Securities
               and Exchange Act of 1934, as amended. Omitted information
               has been replaced with asterisks.)..........................
    10.13      Assignment and Assumption Agreement, dated as of February 3,       *
               1996, between American Shared Radiosurgery Services
               (assignor) and GK Financing, LLC (assignee).(4).............
    10.14      Lease Agreement for a Gamma Knife Unit dated as of April 6,
               1994, between Ernest A. Bates, M.D. and NME Hospitals, Inc.
               dba USC University Hospital. (Confidential material
               appearing in this document has been omitted and filed
               separately with the Securities and Exchange Commission in
               accordance with Rule 24b-2, promulgated under the Securities
               and Exchange Act of 1934, as amended. Omitted information
               has been replaced with asterisks.)..........................
    10.15      Assignment and Assumption and Agreement dated as of February
               1, 1996 between Ernest A. Bates, M.D. and GK Financing, LLC
               with respect to the Lease Agreement for a Gamma Knife dated
               as of April 6, 1994 between Ernest A. Bates, M.D. and NME
               Hospitals, Inc. dba USC University Hospital. ...............
    10.16      Lease Agreement for a Gamma Knife Unit dated as of October
               31, 1996 between Hoag Memorial Hospital Presbyterian and GK
               Financing, LLC. (Confidential material appearing in this
               document has been omitted and filed separately with the
               Securities and Exchange Commission in accordance with Rule
               24b-2, promulgated under the Securities and Exchange Act of
               1934, as amended. Omitted information has been replaced with
               asterisks.).................................................
</TABLE>
<PAGE>   5
 
<TABLE>
<CAPTION>
    EXHIBIT                                                                  SEQUENTIAL
    NUMBER                             DESCRIPTION                           PAGE NUMBER
    -------                            -----------                           -----------
    <S>        <C>                                                           <C>
    10.17      Addendum to Lease Agreement for a Gamma Knife Unit dated as
               of December 1, 1998 between Hoag Memorial Hospital
               Presbyterian and GK Financing, LLC. (Confidential material
               appearing in this document has been omitted and filed
               separately with the Securities and Exchange Commission in
               accordance with Rule 24b-2, promulgated under the Securities
               and Exchange Act of 1934, as amended. Omitted information
               has been replaced with asterisks.)..........................
    10.18      Lease Agreement for a Gamma Knife Unit dated as of October
               29, 1996 between Methodist Healthcare Systems of San
               Antonio, Ltd., dba Southwest Texas Methodist Hospital and GK
               Financing, LLC. (Confidential material appearing in this
               document has been omitted and filed separately with the
               Securities and Exchange Commission in accordance with Rule
               24b-2, promulgated under the Securities and Exchange Act of
               1934, as amended. Omitted information has been replaced with
               asterisks.).................................................
    10.19      Lease Agreement for a Gamma Knife Unit dated as of April 10,
               1997 between Yale-New Haven Ambulatory Services Corporation
               and GK Financing, LLC. (Confidential material appearing in
               this document has been omitted and filed separately with the
               Securities and Exchange Commission in accordance with Rule
               24b-2, promulgated under the Securities and Exchange Act of
               1934, as amended. Omitted information has been replaced with
               asterisks.).................................................
    21.        Subsidiaries of American Shared Hospital Services. .........
    23.1       Consent of Grant Thornton, LLP. ............................
    23.2       Consent of Ernst & Young, LLP. .............................
    27.        Financial Data Schedule for the year ended December 31,
               1998. ......................................................
</TABLE>
 
- ---------------
(1) These documents were filed as Exhibits 2.1 and 10.13b, respectively, to the
    registrant's Annual Report on Form 10-K for fiscal year ended December 31,
    1997, which is incorporated herein by this reference.
 
(2) This document was filed as Exhibit 3.1 to registrant's Registration
    Statement on Form S-2 (Registration No. 33-23416), which is incorporated
    herein by this reference.
 
(3) These documents were filed as Exhibits 3.2, 4.6 and 4.8, respectively, to
    registrant's Registration Statement on Form S-1 (Registration No. 33-63721)
    filed on October 26, 1995, which is incorporated herein by this reference.
 
(4) These documents were filed as Exhibits 4.14 and 10.13, respectively, to the
    registrant's Pre-Effective Amendment No. 1 to registrant's Registration
    Statement on Form S-1 (Registration No. 33-63721) filed on March 29, 1996,
    which is incorporated herein by this reference.
 
(5) These documents were filed as Exhibits 10.24 and 10.35 respectively, to
    registrant's Registration Statement on Form S-2 (Registration No. 33-23416),
    which is incorporated herein by this reference.
 
(6) This document was filed as Exhibit A to registrant's Proxy Statement, filed
    on August 31, 1995, which is incorporated herein by this reference.
 
(7) This document was filed as Exhibit B to registrant's Proxy Statement, filed
    on August 31, 1995, which is incorporated herein by this reference.

<PAGE>   1
                                                                  EXHIBIT 10.11a


                      ASSIGNMENT AND ASSUMPTION AGREEMENT

THIS ASSIGNMENT AND ASSUMPTION AGREEMENT is made as of the 31st day of December 
1995 by and between AMERICAN SHARED RADIOSURGERY SERVICES, a California 
corporation, ("Assignor") and GK FINANCING, LLC ("Assignee").

     RECITALS:

          A.   Assignor is a member of Assignee.

          B.   Pursuant to the Operating Agreement for GK Financing, LLC, 
Assignor has agreed to assign that contract between the Regents of the 
University of California dated July 3, 1990 and amended August 1, 1995, a full 
copy of which is attached here as Exhibit A (the "Contract").

     AGREEMENT:

     NOW, THEREFORE, for good and valuable consideration, the receipt and 
sufficiency of which is hereby acknowledged, and in consideration of the 
premises and mutual covenants herein contained, the parties hereby agree as 
follows:

     1.   ASSIGNMENT.  Assignor hereby grants, conveys, transfers and assigns 
to Assignee, its successors and assigns, all of Assignor's rights, title and 
interest under, in and to the Contract.

     2.   ASSUMPTION OF LIABILITIES.  Assignee hereby accepts the grant, 
conveyance, transfer and assignment by Assignor to Assignee, in successors and 
assigns, of all of Assignor's rights, title and interest under, in and to the 
Contract, and hereby assumes and agrees to perform and discharge all of 
Assignor's executory obligations arising under the Contract (the "Assumed 
Contract Liabilities").

     3.   NO ASSUMPTION OF OTHER LIABILITIES. Except for the Assumed Contract 
Liabilities identified in Section 2, Assignee does not assume, and shall not in 
any manner become responsible or liable for, and Assignor shall retain, pay, 
discharge and perform in full, all other debts, obligations or liabilities of 
Assignor, whether known or unknown, fixed, contingent or otherwise.

     4.   MISCELLANEOUS PROVISIONS.

          4.1  FURTHER ASSURANCES. Assignor and Assignee agree, at the other 
party's request, whether on or after the date hereof, and without further 
consideration, that each shall execute and deliver any and all further 
instruments and documents, and take such further actions, as the other party 
may reasonably request or as may reasonably be required in order more 
effectively to vest in Assignee all of Assignor's rights, title and interest 
under, in and to the Contract, and to evidence Assignee's assumption of the 
Assumed Contract Liabilities, or to otherwise carry out the provisions of this 
Agreement.

<PAGE>   2
     4.2  BINDING EFFECT. All of the terms, provisions and conditions of this 
Agreement shall be binding on, and shall inure to and to be enforceable by, 
the parties hereto and their respective successors and assigns.


     4.3  GOVERNING LAW. This Agreement shall be governed by, and construed in 
accordance with, the Laws of the State of California.

IN TESTIMONY WHEREOF, the parties hereto have duly executed this Agreement as of
the day and year first above written.


                                        AMERICAN SHARED RADIOSURGERY SERVICES


                                        By: /s/ Ernest A. Bates, M.D.
                                           ----------------------------------

                                        Title: President                     
                                           ----------------------------------




                                        GK FINANCING, LLC

                                        By: /s/ Craig K. Tagawa
                                           ----------------------------------

                                        Title: Chief Executive Officer       
                                           ----------------------------------
                                               ("Assignee")


<PAGE>   1
                                                                  EXHIBIT 10.11c


Confidential material appearing in this document has been omitted and filed 
separately with the Securities and Exchange Commission in accordance with Rule 
24b-2, promulgated under the Securities Exchange Act of 1934, as amended. 
Omitted information has been replaced with asterisks.


       AMENDMENT NUMBER ONE TO THE LEASE AGREEMENT FOR A GAMMA KNIFE UNIT

                                    BETWEEN

                  THE REGENTS OF THE UNIVERSITY OF CALIFORNIA

                                      AND

                       AMERICAN SHARED HOSPITAL SERVICES

This Amendment Number One (1), effective August 1, 1995, constitutes the first 
amendment to the lease Agreement for a Gamma Knife Unit which was first 
effective on September 17, 1991 between the Regents of the University of 
California (hereinafter referred to as "University"), and American Shared 
Hospital Services, a California Corporation (hereinafter referred to as "ASHS").

WHEREAS, the parties hereto desire to amend the above referenced Agreement;

NOW THEREFORE, it is hereby agreed between the parties that said Agreement is 
amended as follows:

1.  The initial term of this Agreement shall be extended through September 17, 
1998.

2.  [*]

3.  Paragraph 14 shall be deleted and replaced by the following:

        14.  Options to Extend Agreement.

             (a)  University shall have the option at the end of the seven (7) 
year initial Term to:

                        (i)   [*]

                       (ii)   [*}
<PAGE>   2
                        
                      (iii)  [*]

University shall exercise one (1) of the three (3) options referred to above, 
by mailing an irrevocable written notice thereof to ASHS at Four Embarcadero 
Center, Suite 3620, San Francisco, California 94111 by registered mail, 
postmarked on or before the end of the sixth (6th) year of the seven (7) year 
initial Term of this Agreement. Any such notice shall be sufficient if it 
states in substance that the University elects to exercise its option and 
states which of the three (3) options referred to above University is 
exercising. [*].

In the event University chooses to exercise either option (i) or (ii) of the 
options listed above, the following terms shall apply to the transaction:

The "Closing Date" shall be the first (1st) business day eighty-four (84) 
months after the Commencement Date. The Closing Date may be extended by mutual 
agreement of the parties.

On or before the Closing Date, University shall deliver to ASHS cash funds in 
the amount of the purchase price.

On or before the Closing Date, ASHS shall deliver to University four (4) 
duplicate original copies of a bill of sale duly executed and acknowledged by 
University and the legal owner of the Equipment, which bills of sale shall 
warrant and defend University from and against any and all liens, encumbrances, 
security interests for claims of third parties, and shall be in a form 
reasonably satisfactory to counsel for University.

At the time University receives free and clear title to the Gamma Knife, ASHS 
agrees that the Gamma Knife equipment shall include the Hewlett-Packard 
hardware and Gamma Plan software that is currently a part of the Equipment and 
is part of a Beta Test Site agreement with Elektra.

It is understood by ASHS and University that ASHS is not responsible for any 
additional hardware, Cobalt reloading, or software changes and/or other 
modifications to the Gamma Knife Unit except as agreed upon by the University 
and ASHS. This Agreement may be modified to reflect any changes and/or 
modifications.


                                  Page 2 of 3
<PAGE>   3
5.   University understands that ASHS will modify or enter into a new Gamma 
     Knife maintenance Agreement with Elekta. ASHS shall insure University that 
     it will receive equipment service comparable to that available under the 
     original service agreement with Elekta. ASHS shall provide University 
     with copies of the new service agreement prior to entering into the 
     Agreement.

6.   ASHS shall insure that the refinancing of its current Gamma Knife loan 
     will in no way infringe on University's contract terms and conditions to 
     own the Gamma Knife at the completion of the initial term of this 
     Agreement.

7.   The University may re-open negotiations on price and service at any time 
     during the period of the Agreement. It is understood by University, 
     however, that ASHS is under no obligations to make any changes or 
     modifications to this Agreement.


All the other terms and conditions of the original Agreement shall continue in 
full force and effect.

IN WITNESS WHEREOF, the parties have executed this Amendment as of the date 
indicated.

AMERICAN SHARED HOSPITAL SERVICES            THE REGENTS OF THE 
                                             UNIVERSITY OF CALIFORNIA


BY:  /s/ Ernest A. Bates, M.D.               BY:  /s/ Chuck Hancock
    --------------------------                   -------------------------
    Ernest A. Bates, M.D.

TITLE: Chairman and CEO                      TITLE: SR. MEDICAL BUYER
    --------------------------                   -------------------------


DATE: August 22, 1995                        DATE: August 22, 1995
    --------------------------                   -------------------------




                                  Page 3 of 3

<PAGE>   1
                                                                  EXHIBIT 10.11d


 Confidential material appearing in this document has been omitted and filed
separately with the Securities and Exchange Commission in accordance with Rule
24b-2, promulgated under the Securities Exchange Act of 1934, as amended.
Omitted information has been replaced with asterisks.


                     LEASE AGREEMENT FOR A GAMMA KNIFE UNIT

     THIS AGREEMENT FOR A GAMMA KNIFE UNIT, (hereinafter, referred to as the
"Agreement") is entered into between AMERICAN SHARED HOSPITAL SERVICES, a
California corporation, (hereinafter referred to as "ASHS"), and THE REGENTS OF
THE UNIVERSITY OF CALIFORNIA (hereinafter referred to as "University").

                                R E C I T A L S

     WHEREAS, University wants to lease a Leksell Stereotactic Gamma Unit
Manufactured by Elekta Instruments, Inc., (hereinafter referred to as the
"Equipment"); and

     WHEREAS, ASHS is willing to lease the Equipment which ASHS has acquired 
from Elekta Instruments, Inc., a Georgia corporation (hereinafter referred to 
as "Elekta"), to University, pursuant to the terms and conditions of this 
Agreement.

     NOW, therefore, in consideration of the foregoing premises and the 
promises contained herein, the parties hereto hereby agree as follows:

     1.   Execution of LGU Agreement by and between University and Elekta. 
University agrees that simultaneously with the execution of this Agreement it 
shall execute that certain LGU Agreement with Elekta, (hereinafter referred to 
as the "LGU Agreement"), a copy of which is attached hereto as Exhibit A and 
incorporated herein by this reference. University agrees to fulfill all of 
its obligations under the LGU Agreement and acknowledges that ASHS is a third 
party beneficiary of the LGU Agreement. University  shall fully indemnify and 
hold harmless ASHS in the event that ASHS suffers any loss, damage, claim or 
expense (including attorneys' fees) solely as a result of University's breach 
of the LGU Agreement.

     2.   Delivery of the Equipment and Site preparation. ASHS shall arrange to 
have the Equipment delivered to University, at 505 Parnassus Avenue, San 
Francisco, California (the "Site") in coordination with Elekta. ASHS shall 
exert its best faith efforts to expedite the delivery of the Equipment in 
accordance with the terms and conditions of the Purchase Agreement for the 
Equipment by and between ASHS and Elekta. Notwithstanding the preceding 
sentence, it is understood and agreed that ASHS has made no representations or 
warranties to University concerning actual delivery dates or schedules for the 
Equipment at the Site. University acknowledges that it has reviewed and 
approved the Purchase Agreement for the Equipment by and between ASHS and 
Elekta. University further acknowledges that it has fully reviewed and accepts 
Exhibits A and E (Specification and Acceptance texts) and the Site Planning 
Criteria all as set forth in said Purchase Agreement for the Equipment by and 
between ASHS and Elekta.


<PAGE>   2
     University shall provide a safe, convenient and properly prepared Site, at 
its own expense, in accordance with all of the Equipment manufacturer's 
(Elekta's) guidelines, specifications, technical instruments and Site Planning 
Criteria (which Site Planning Criteria are attached hereto as Exhibit B and 
incorporated herein by this reference), which criteria shall include Elekta's 
estimated delivery schedule when and as received by ASHS, on University 
controlled property (The "Site") for the proper performance of Gamma Knife 
procedures. University shall prepare at its sole cost and expense the 
requisite site plans and specifications and shall submit them to Elekta and 
ASHS for approval. University shall obtain a User License from the Nuclear 
Regulatory Commission and/or appropriate state agency authorizing it to take 
possession of the Cobalt Supply and shall obtain such other licenses, permits, 
approvals, consents and authorizations, which may be required by local 
governmental or other regulatory agencies for the Site, its preparation, the 
charging of the Equipment with its Cobalt Supply, the conduct of Acceptance 
Tests, and the use of the Equipment all as more fully set forth in Article 2.1 
of the LGU Agreement.

     3.   Commencement of Term.  The Term (hereinafter defined) of this 
Agreement shall commence upon the performance of the first paid Gamma Knife 
procedure at the Site (the "Commencement Date"). University shall become liable 
to ASHS for the payments referred to in Paragraph 6 hereinbelow upon the 
Commencement Date.

     4.   Costs of Site Preparation; Costs of Installation. University's 
obligations shall include preparation of plans and specifications for the 
construction and preparation of the Site in such form as will result in the 
Site, when constructed in accordance with such plans and specifications, being 
in full compliance with Elekta's Site Planning Criteria. University shall at 
its own expense and risk, prepare, construct and make ready the Site as 
necessary, for the installation of the Equipment, including, but not limited 
to, providing any temporary and/or permanent shielding for the charging of the 
Equipment and its use, selecting and preparing a proper foundation for the 
Equipment and for such shielding and walls, as well as proper alignment of the 
Site and wiring. University shall prepare and be financially responsible for 
the positioning of the Equipment on its foundation at the Site.

     University shall also at its own expense select, purchase and install all 
radiation monitoring equipment and devices, safety circuits and radiation 
warning signs needed for the Equipment at the Site, according to all applicable 
federal, state and local laws, regulations, recommendations or custom.

     Upon completion of the Site, University shall warrant that the Site will 
be safe and suitable for its use of the Equipment. University shall fully 
indemnify and hold harmless ASHS from any and all loss, liability, damage, 
expense or claim (including attorneys' fees) which ASHS may suffer and incur 
and which relate to the Site and the Equipment's positioning thereon.



                                       2
<PAGE>   3
       University shall be liable to ASHS for any damage to the Equipment caused
by (a) defects in construction of the Site or defects in the positioning of the 
Equipment at the Site; (b) defects arising out of materials or parts provided, 
modified or designed by University with respect to the Site; or (c) negligent 
or intentional acts of omission or commission by University or any of its 
officers, agents, physicians, and employees in connection with the Site 
preparation or operation of the Equipment at the Site.

       University warrants that it shall utilize its best efforts to fulfill 
its obligations under this Paragraph 4. University further warrants that it 
shall on a regular basis keep ASHS informed of University's progress in 
fulfilling its obligations pursuant to this Paragraph 4.

       5.     Term of the Equipment. ASHS agrees to provide to University the 
Equipment pursuant to the terms of this Agreement, for a term of five (5) years 
from the Commencement Date (the "Term") as described in Paragraph 3 
hereinabove, unless terminated earlier as provided herein.

       6.     *

       7.     Use of the Equipment. The Equipment may be used by University 
only at the location stated above and shall not be removed therefrom. 
University shall not assign or sublease the Equipment or its rights hereunder 
without the prior written consent of ASHS; which consent shall not be 
unreasonably withheld. No permitted assignment or sublease shall relieve 
University of any of its obligations hereunder. University shall not use nor 
permit the Equipment to be used in any manner nor for any purpose for which, in 
the opinion of Elekta or ASHS, the Equipment is not designed or reasonably 
suitable. University shall not permit any liens, whether voluntary or 
involuntary, to attach to the Equipment, without the prior written consent of 
ASHS. University shall have no interest in the Equipment other than the rights 
acquired as a lessee hereunder and the Equipment shall remain the property of 
ASHS regardless of the manner in which it may be installed or attached at the 
Site. University shall, at ASHS's request, affix to the Equipment tags, decals, 
or plates furnished by ASHS, indicating ASHS's ownership of the Equipment.



                                       3
<PAGE>   4
       8.     Additional Covenants of University. In addition to the other 
covenants made by University herein, University shall at its own cost and 
expense:

       (a)    Provide properly trained professional, technical and support 
personnel required for the proper performance of medical procedures utilizing 
the equipment.

       (b)    Assume all medical and financial responsibility for the 
overseers' monitoring of all patients' medical condition and treatment.

       (c)    Fully comply with all of its obligations under the LGU Agreement.

       (d)    Indemnify ASHS as herein provided: (i) University hereby agrees 
to indemnify and/or reimburse ASHS on a prompt basis for any and all damage to 
the Equipment (including any violations by University, its agents, officers, 
physicians, employees, successors and assigns of the Service Agreement 
described in Paragraph 16 hereof) to the extent such damages are caused by the 
negligent or other wrongful acts or omissions of University, its agents, 
officers, physicians and employees. In the event the Equipment is destroyed or 
rendered unusable, this indemnification shall extend up to (but not exceed) the 
full replacement value of the Equipment at the time of its destruction less 
salvage value, if any. (ii) University hereby further agrees to indemnify and 
hold ASHS, its agents, officers, employees, successors and assigns, harmless 
from and against any and all claims, liabilities, obligations, losses, damages, 
injuries, penalties, actions, claims, costs and expenses (including attorneys' 
fees) for all events and/or occurrences described in Article 7.3 of the LGU 
Agreement to the same extent that University agrees to indemnify Elekta 
thereunder. University further agrees to fully indemnify and hold harmless ASHS 
for any loss, damage, claim, or expense (including attorneys' fee) ASHS may 
suffer or incur as a result of University's breach of the LGU Agreement.

       9.     Additional Covenants, Representations and Warranties of ASHS. In 
addition to the other covenants, representations and warranties, made by the 
ASHS in this Agreement:

       (a)    ASHS represents and warrants that ASHS has full power and 
authority to enter into this Agreement, and that this Agreement does not and 
will not violate any agreement, contract or instrument binding upon ASHS.

       (b)    ASHS represents and warrants to University that, upon delivery of 
the Equipment to University, ASHS shall use its best faith efforts to require 
that Elekta meets its contractual



                                       4
<PAGE>   5
obligations to ASHS and assists University in putting the Equipment, as soon as 
possible, into good, safe and serviceable condition and fit for its intended 
use in accordance with the manufacturer's specifications, guidelines and field 
modification instructions.

          (c)  ASHS shall notify the manufacturer of the Equipment that all 
repair and maintenance work to be performed on the Equipment in accordance with 
the Service Agreement described in Paragraph 16, hereof shall be performed at 
the direct request of University.

          (d)  ASHS represents and warrants that throughout the term of this 
Agreement, University shall enjoy the use of the Equipment, free of the rights 
of any other persons except for those rights reserved by or granted to Elekta 
under the LGU Agreement or under Elekta's Purchase Agreement with ASHS.

          (e)  ASHS shall maintain in full force and effect the Service 
Agreement referenced in Paragraph 16 hereof. With respect to such Service 
Agreement, University warrants that it will not knowingly allow or cause any 
acts by its agents, officers, employees, and physicians which will jeopardize 
ASHS's rights under said Service Agreement.

           10. Ownership/Title. It is expressly understood that University 
shall acquire no right, title or interest in or to the Equipment, other than 
the right to the possession and use of the same in accordance with the terms of 
this Agreement.

               ASHS may at its sole discretion finance the Equipment. Financing 
may be in the form of an installment loan or a capitalized lease or other 
commercially available debt instrument. Should ASHS finance the Equipment 
through an installment loan, ASHS shall be required to provide the Equipment as 
collateral against the loan. Should ASHS finance the Equipment through a 
capitalized lease title shall vest with the lessor. ASHS shall, however, 
structure the capitalized lease such that it can fulfill its obligations to 
University pursuant to Paragraph 14 hereunder.

          11. Cost of Use of the Equipment. Except as is otherwise provided 
herein, University shall bear the entire cost of using the Equipment during the 
Term of this Agreement. This shall include, but not be limited to, providing 
properly trained professional, technical and support personnel to properly 
operate the Equipment. University shall be fully responsible and liable for all 
acts and/or omissions of such professional, technical and support personnel.

                                       5
<PAGE>   6
          12. Taxes. ASHS shall pay any personal property taxes levied against 
the Equipment and any other taxes or governmental fees or assessments, however 
denoted, whether of the federal government, any state government or any local 
government, levied or based on this Agreement or the use of the Equipment 
except for those taxes, if any, pertaining to the gross income or gross 
receipts of University.

          13. Maintenance and Inspections. ASHS agrees to exercise due and 
proper care in the maintenance of the Equipment and to keep the Equipment in a
good state of repair, reasonable wear and tear excepted, by entering into the
Service Agreement described in paragraph 16 hereof. University shall be liable
to ASHS for all damage to the Equipment caused by the misuse, negligence,
improper use or other intentional or negligent acts or omissions of University's
employees, officers, agents, and physicians.

               ASHS (and Elekta) shall have the right of access to the Equipment
for the purpose of inspecting same at all reasonable times and upon reasonable
notice and with a minimum of interference to University's operations. In the
event the Equipment is improperly used by University or its employees, agents,
officers, and physicians, ASHS may service or repair the same as needed and such
expense shall be paid by University, unless the repair is covered by the Service
Agreement described in Paragraph 16 hereof.

          Any work so performed by or in the service or maintenance of the 
Equipment as a result of University's failure or neglect to do so shall not 
deprive ASHS of any of its rights, remedies or actions against University for 
damages caused by such failure or neglect.

          14.  Options to Extend Agreement.

               (a)  University shall have the option at the end of the five (5)
year initial Term to:

                    (i)  Purchase the Gamma Knife for the sum of One Dollar 
($1.00) if at least one thousand (1,000) paid procedures have been performed 
during the five (5) year initial Term.

                    (ii) If after the five (5) year initial Term, less than 
one thousand (1,000) paid procedures have been performed, the University may 
purchase the Gamma Knife at the end of the five (5) year initial Term based 
upon the difference in the number of procedures actually performed and the one 
thousand (1,000) case base for the One Dollar ($1.00) buy-out. At the time of 
negotiation, University will pay ASHS for its unfunded portion of the Equipment 
and would negotiate the inclusion of unfunded operating expenses directly 
related to the operation and maintenance of the Equipment. An example of how 
this would be calculated is shown in Exhibit C which is attached hereto and 
incorporated herein by this reference.

                                       6
<PAGE>   7
                (iii) Terminate this Agreement. If University terminates this 
Agreement and does not purchase the Gamma Knife, ASHS shall remove the Gamma 
Knife within an agreed upon period of time after the expiration of the five (5) 
year initial Term.

                (iv) Renegotiate this Agreement for a specified renewal term 
taking into account the first five (5) years of activity of the Equipment at 
the Site.

                University shall exercise one (1) of the four (4) options 
referred to above, by mailing and irrevocable written notice thereof to ASHS at
444 Market Street, Suite 2420, San Francisco, California, 94111, by registered
mail, postmarked on or before the end of the fourth (4th) year of the five (5)
year initial Term of this Agreement. Any such notice shall be sufficient if it
states in substance that University elects to exercise its option and states
which of the four (4) options referred to above University is exercising. In the
event that option (i) is elected on a timely basis by University and at such
time less than 1,000 paid procedures have been performed on the equipment then,
University shall simultaneously elect either option (ii) or (iv) which will come
into effect if 1,000 paid procedures have not been performed upon expiration of
the five (5) year initial term.

                In the event University chooses to exercise either option (i) 
or (ii) of the options listed above, the following terms shall apply to the 
transaction:

                The "Closing Date" shall be the first (1st) business day sixty 
(60) months after the Commencement Date. The closing Date may be extended by 
mutual agreement of the parties.

                On or before the Closing Date, University shall deliver to ASHS 
cash funds in the amount of the purchase price.

                On or before the Closing Date, ASHS shall deliver to University 
four (4) duplicate original copies of a bill of sale duly executed and
acknowledged by University and the legal owner of the Equipment, which bills of
sale shall warrant and defend University from and against any and all liens,
encumbrances, security interests for claims of third parties, and shall be in a
form reasonably satisfactory to counsel for University.

        15.     Right of First Refusal. If, at any time during the five (5) 
year initial Term of this Agreement, ASHS receives an offer in writing to
purchase ASHS's interest in the Equipment or any part thereof, which offer ASHS
wishes to accept, ASHS shall first notify University in writing of ASHS's
intention to accept said offer. The terms and conditions of the original offer
must apply.


                                       7
<PAGE>   8
                University shall have the right, within sixty (60) days after 
receipt of ASHS's written notification, to accept the terms of said offer in its
own name. If University shall not so elect within said sixty (60) day period,
ASHS may then sell the Equipment within sixty (60) days to the offeror, provided
that said sale shall be the same terms and conditions as set forth in the
proposed offer sent to University; and provided, further, that such sale shall
be subject to the terms and provisions of this Agreement.

                In the event ASHS does not sell the Equipment within the sixty 
(60) day period to the original offeror, ASHS shall not sell the Equipment until
ASHS provides University with another right of first refusal pursuant to the
terms of this Paragraph 15.

                If University does not exercise its right of first refusal, 
then any such sale shall be subject to the terms and conditions of this
Agreement, and the purchaser of the Equipment shall assume and agree to be bound
by all of the terms and provisions of this Agreement; provided, further, that
ASHS shall not be relieved from liability incurred before the sale hereunder by
reason of any such sale of the Equipment.

        16.     Service Agreement. ASHS warrants that it shall simultaneously 
with the execution of this Agreement enter into a Service Agreement with Elekta 
(the "Service Agreement") a copy of which is attached hereto as Exhibit D and 
incorporated herein by this reference.

        17.     No Warrants by ASHS. University warrants that as of the 
Commencement Date, it shall have (a) thoroughly inspected the Equipment; (b)
determined for itself that all items of the Equipment are of a size, design,
capacity and manufacture selected by it; and (c) satisfied itself that the
Equipment is suitable for University's purposes. ASHS SUPPLIES THE EQUIPMENT "AS
IS" AND NOT BEING THE MANUFACTURER OF THE EQUIPMENT OR THE MANUFACTURER'S AGENT,
MAKES NO WARRANTY OR REPRESENTATION, EITHER EXPRESSED OR IMPLIED, AS TO THE
EQUIPMENT'S MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, DESIGN,
CONDITION, DURABILITY, CAPACITY, MATERIAL OR WORKMANSHIP OR AS TO PATENT
INFRINGEMENT OR THE LIKE, it being agreed that all such risks as between ASHS
and University, shall be borne by University. University agrees to look solely
to the manufacturer (Elekta) or to suppliers of the equipment (and its software)
for any and all warranty claims. Any and all warranties made by Elekta will be
in its good faith best efforts enforced by ASHS on behalf of University during
the five (5) year initial Term hereof. University agrees that ASHS shall not be
responsible for the delivery, installation, or operation of the Equipment or for
any delay or inadequacy of any or all of the foregoing. ASHS shall not be
responsible for any direct or indirect consequential loss or damage resulting
from the installation, operation or use of the Equipment or otherwise.
University ex

                                       8
<PAGE>   9
pressly waives any right to hold ASHS liable hereunder for any claims, demands 
and liabilities arising out of or in connection with the design, manufacture, 
possession or operation of the Equipment.

     18.  Events of Default and Remedies. The occurrence of any one of the 
following shall constitute an Event of Default hereunder:

          (a)  University fails to pay any installment of semi-monthly 
procedure payments when due when such default continues for a period of thirty 
(30) days after notice thereof from ASHS or its assignee is given to University;

          (b)  University attempts to remove, sell, transfer, encumber, sublet 
or part with possession of the Equipment or any items thereof, except as 
expressly permitted herein;
     
          (c)  University shall fail to observe or perform any of the other 
obligations required to be observed or performed by University hereunder and 
such failure shall continue uncured for twenty (20) days after written notice 
thereof to University by ASHS;

          (d)  University ceases doing business as a going concern, makes an 
assignment for the benefit of creditors, admits in writing its inability to pay 
its debts as they become due, files a voluntary petition in bankruptcy, is 
adjudicated a bankrupt or an insolvent, files a petition seeking for itself any 
reorganization, arrangement, composition, readjustment, liquidation, 
dissolution or similar arrangement under any present or future statute, law or 
regulation or files an answer admitting the material allegations of a petition 
filed against it in any such proceeding, consents to or acquiesces in the 
appointment of a trustee, receiver, or liquidator of it or of all or any 
substantial part of its assets or properties, or if it or its shareholders 
shall take any action looking to its dissolution or liquidation.

          (e)  Within sixty (60) days after the commencement of any proceedings 
against University seeking reorganization, arrangement, readjustment, 
liquidation, dissolution or similar relief under any present or future statute, 
law or regulation, such proceedings shall not have been dismissed, or if within 
thirty (30) days after the appointment without University's consent or 
acquiescence of any trustee, receiver or liquidator of it or of all or any 
substantial part of its assets and properties, such appointment shall not be 
vacated.

          Upon the occurrence of an Event of Default, ASHS may at its option do 
any or all of the following: (i) by notice to University, terminate this 
Agreement as to the Equipment in default; (ii) whether or not this Agreement is 
terminated, take possession of any or all of the Equipment in default, wherever 
situated, and for such purpose, enter upon the site without liability for so 
doing or ASHS may cause University and University hereby


                                       9
<PAGE>   10
agrees, to return the Equipment to ASHS at University's sole cost and expense;
(iii) recover from, as liquidated damages for the loss of the bargain and not as
a penalty, an amount equal to the present value of the then unfunded costs of
ASHS calculated in accordance with the formula set forth in Exhibit C discounted
at the rate of nine percent (9%), which payment shall become immediately due and
payable; (iv) sell, dispose of, hold, use or lease the Equipment in default, as
ASHS in its sole discretion may determine (and ASHS shall not be obligated to
give preference to the sale, lease or other disposition of the Equipment over
the sale, lease or other disposition of similar Equipment owned or leased by
ASHS). In any event, University shall, without further demand, pay to ASHS an
amount equal to all sums due and payable for all periods up to and including the
date on which ASHS has declared this Agreement to be in default.

          In the event that University shall have paid to ASHS the liquidated
damages referred to in (iii) above, ASHS hereby agrees to pay to University
promptly after receipt thereof, all rentals or proceeds received from the
reletting or sale of the Equipment during the balance of the five (5) year
initial Term (after deduction of all expenses incurred by ASHS; said amount
never to exceed the amount of the liquidated damages paid by University).
University agrees that ASHS shall have no obligation to sell the Equipment.
University shall in any event remain fully liable for reasonable damages as
provided by law for all costs and expenses incurred by ASHS on account of such
default, including but not limited to, all court costs and reasonable attorneys'
fees. University hereby agrees that, in any event, it shall be liable for any
deficiency after any sale, lease or other disposition of the Equipment by ASHS.
The rights afforded ASHS hereunder shall not be deemed to be exclusive, but
shall be in addition to any other rights or remedies provided by law.

     19.  Insurance.

          (a)  During the five (5) year initial Term of this Agreement (and any
successive terms) ASHS shall, at its own cost and expense, keep in effect an all
risk and hazard insurance policy covering the Equipment. The all risk and hazard
insurance policy shall be for an amount not less than the replacement cost of
the Equipment. During the five (5) year initial Term of this Agreement,
University shall, at its own cost and expense keep in effect public liability
and professional liability insurance policies or self insurance concerning the
operation of the Equipment by University. Said policies shall be in the amounts
of not less than $1,000,000 per occurrence and $5,000,000 in aggregate per year.
University and ASHS, their successors and assigns, shall be named as additional
insureds and/or loss payees on the insurance policies maintained hereunder by
the other party. Evidence of such insurance coverages shall be furnished by both
parties to the other party upon written request, by no later than the
Commencement Date.

                                       10
<PAGE>   11
                (b)  If the Equipment is rendered unusable as a result of any 
physical damage to, or destruction of, the Equipment, University shall give to 
ASHS immediate notice.  ASHS shall determine, within thirty (30) days after the 
date of occurrence of such damage or destruction, whether the Equipment can be 
repaired. In the event ASHS determines that the Equipment cannot be repaired, 
ASHS at its sole cost and expense shall promptly replace the Equipment. This 
Agreement shall continue in full force and effect as though such damage or 
destruction had not occurred. In the case of such occurrence specified in 
paragraph 19(b), this Agreement shall be extended by the time lost to such 
delay. In the event ASHS determines that the Equipment can be repaired, ASHS 
shall cause the Equipment to be promptly repaired. All proceeds of insurance 
received by ASHS under said policy shall be applied towards the cost of any 
such repair or replacement of the Equipment.

                20.  Notices.  Any notices required under this Agreement how 
shall be sent in writing and shall be deemed to have been duly given if 
delivered by hand or mailed by certified or registered mail to the following 
addresses:

                To ASHS:        E. A. Bates, M.D., C.E.O.
                                444 Market Street, Suite 2420
                                San Francisco, CA  94111

                To University:  William B. Kerr, Director
                                Medical Center at the University
                                of California, San Francisco
                                505 Parnassus Avenue
                                San Francisco, CA  94143-0208

Or to such other addresses as either party may specify for the reception of 
notice from time to time in writing to the other party. Any such notice shall 
be effective only when actually received by the party to whom addressed.

                21.  Integration/Supersedure.  This Agreement and those 
University of California terms and conditions of equipment lease (Appendix F, 
Rev 9/86) contains the full and entire Agreement between the parties hereto, 
and no oral or written understanding is of any force or effect whatsoever 
unless expressly contained in a writing executed subsequent to the date of 
this Agreement. To the extent of any inconsistencies between the terms and 
conditions of this Agreement and the provisions of Appendix F, the terms and 
conditions of this Agreement shall supersede those contained on Appendix F. It 
is understood that paragraph one of ARTICLE 5 -  TERMINATION in Appendix F - is 
not applicable as these University lease payments are not dependent upon a 
funding agency.



                                       11
<PAGE>   12
     22.  WAIVERS. To the extent that ASHS fails or chooses not to pursue any of
its remedies under this Agreement or pursuant to applicable law, such shall not
prejudice ASHS's a rights to pursue any of those remedies at any future time and
shall not constitute a waiver of ASHS's rights.

     23.  ASSIGNMENTS. This Agreement is binding on and shall inure to the
benefit of the heirs, executors, administrators, successors or assigns of the
respective parties hereto, except that neither party may assign its rights or
obligations under this Agreement without the express written consent of the
other (which consent shall not be unreasonably withheld).

     24.  AMENDMENTS. This Agreement shall not be amended or altered in any
manner unless such amendment or alteration is in a writing signed by both
parties.

     25.  RECORD-KEEPING REQUIREMENTS. To the extent required by the regulations
promulgated by the Health Care Financing Administration pursuant to Section 952
of the Omnibus Reconciliation Act of 1980, ASHS shall:

          (a)  Until the expiration of four (4) years following the furnishing
of services pursuant to this Agreement, ASHS agrees to make available upon
written request of the Secretary of Health and Human Services or the U.S.
Comptroller General or any of their duly authorized representative, this
Agreement, any books, documents and records necessary to verify the nature and
extent of costs incurred by University by reason of the activities of ASHS under
this Agreement; and

          (b)  If ASHS elects to delegate any of its duties under this Agreement
(which have a cost or value of Ten Thousands Dollars  ($10,000.00) or more over
a twelve (12) month period) to a related organization, ASHS may do so only
through a subcontractor which is consented to, by University, it being
understood that, inasmuch as University is entering into this Agreement in
reliance on ASHS's reputation and expertise, that University shall be the sole
judge of the reputation and expertise of the proposed delegee, and only through
a subcontractor which provides that, until the expiration of four (4) years
following the furnishing of services under such subcontract, the related
organization shall make available, on request of the Secretary of Health and
Human Services of the U.S. Comptroller General or any of their authorized
representatives, the subcontract and books, documents and records of the nature
and extent of costs incurred by University by reason of activities of such
related organization under such subcontract. No delegation by ASHS of its duties
hereunder shall relieve ASHS from liability hereunder.



                                       12
<PAGE>   13
          26.  Miscellaneous Provisions.

               (a)  The invalidity of unenforceability of any portion or 
provision of this Agreement shall not effect the validity or enforceability of 
any other portion, nor shall either party's implied or express consent to the 
breach or waiver of any provision of this Agreement constitute a waiver of such 
provision as to any subsequent breach.

               (b)  In the event of any claim or controversy arising hereunder, 
the prevailing party in such claim or controversy shall be entitled to a 
reasonable attorneys' fee in addition to whatever other relief said party would 
be otherwise entitled.

               (c)  Force Majeure. Failure to perform by either party will be 
excused in the event of any delay or inability to perform its duties under this 
Agreement directly or indirectly caused by conditions beyond its reasonable 
control including without limitation, fires, floods, earthquakes, snow, ice, 
disasters, Acts of God, accidents, riots, wars, operation of law, strikes, 
governmental action or regulations, shortages of labor, fuel, power, materials, 
manufacturer delays or transportation problems. In the event of any such 
delays, this Agreement shall be extended by the time lost to such delay.



          IN WITNESS WHEREOF, the parties have signed this Agreement on the day 
and year first above written.


THE REGENTS OF THE                             AMERICAN SHARED HOSPITAL
UNIVERSITY OF CALIFORNIA                        SERVICES, INC.



By   /s/  DIANA HOPPER                          By /s/ ERNEST A. BATES
  ---------------------------------               --------------------------
                                                  Ernest A. Bates, M.D.
                                                  Chairman and 
                                                  Chief Executive Officer





                                       13
<PAGE>   14
                                   EXHIBIT C

     If the number of procedures performed on the Gamma Knife in year one was 
150 and if this procedure load grew at a constant rate of five percent (5%) 
per year over the next five years, the total procedures performed in the five 
year period would be 827 or 173 short of the 1,000 buy-out minimum. In this 
example the cost to UCSF to purchase the machine would be calculated based on 
negotiation as follows:

     1.   The unfunded portion of the equipment would be the difference between 
          the total cost of the equipment (defined as purchase price plus 
          interest expense) and the amount of the equipment funded by the 827 
          cases. If the purchase price of the machine were $2,900,000 and the 
          interest expense was based on 14% over five (5) years, the cost of 
          the machine would be $4,048,828. For 1,000 procedures the unit cost of
          the equipment per procedure would be $4,049. From this base amount the
          number of procedures performed times the unit cost of the procedure
          (827 x $4,049) would equal $3,348,523. This amount would be subtracted
          from the total cost of the machine for a buy-out price of $700,305 for
          the machine portion only.

     2.   The inclusion of unfunded operating expenses directly related to the 
          operation and maintenance of the Equipment would be negotiated and 
          then the same formula as outlined above would be applied to determine 
          the cost of the operating expenses to be included in the buy-out. 
          This would be added to the cost of the machine for a total purchaser 
          price.



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