POSITRON CORP
DEF 14A, 1998-11-20
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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                                 Proxy Statement
        Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Filed by the Registrant  [X]

Filed by a Party other than the Registrant  [ ]

Check the appropriate box:

[ ]  Preliminary Proxy Statement
[ ]  Confidential, for Use of the Commission
      only (as permitted by Rule 14a-6(e)(2))
[X]  Definitive Proxy Statement
[ ]  Definitive Additional Materials
[ ]  Soliciting Material Pursuant to ss.240.14a-11(c) or ss.240.14a-12

                              POSITRON CORPORATION
                (Name of Registrant as Specified in its Charter)

    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):
[X]  No fee required.
[ ] Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

    (1) Title of each class of securities to which the transaction applies:

        (2) Aggregate number of securities to which transaction applies:

        (3) Per unit price or other  underlying  value of  transaction  computed
        pursuant  to  Exchange  Act Rule 0-11 (set forth the amount on which the
        filing fee is calculated and state how it was determined):

        (4) Proposed maximum aggregate value of transaction:

        (5)       Total fee paid:

[ ]  Fee paid previously with preliminary materials.

[ ] Check box if any part of the fee is offset as provided by Exchange  Act Rule
0-11(a)(2)  and  identify  the  filing  for  which the  offsetting  fee was paid
previously.  Identify the previous filing by registration  statement  number, or
the Form or Schedule and the date of its filing.

        (1)       Amount Previously Paid:

        (2)       Form, Schedule or Registration Statement No.:

        (3)       Filing Party:

        (4)       Date Filed:


<PAGE>
                              Positron Corporation
                       1304 Langham Creek Drive, Suite 310
                              Houston, Texas 77084

Dear Stockholder:

         You are cordially  invited to attend the Annual Meeting of Shareholders
of Positron  Corporation  ("Positron") to be held at 10:00 a.m.  Houston,  Texas
time on December 18, 1998 at Positron  Corporation,  1304  Langham  Creek Drive,
Suite 310,  Houston,  Texas.  Shareholders of record at the close of business on
November 10, 1998 are entitled to notice of, and to vote at, the Annual Meeting.
I hope  that you  will be  present  or  represented  by proxy at this  important
meeting.

         At the  Annual  Meeting,  you will be asked to (i) elect one  director,
(ii)  consider  and act  upon a  proposal  of the  Board of  Directors  to amend
Positron's  Articles of Incorporation to increase the authorized Common Stock of
Positron from  15,000,000 to  100,000,000,  (iii) ratify the designation of Ham,
Langston & Brezina,  L.L.P.  as  independent  auditors for the fiscal year ended
December 31, 1997 and (iv)  transact  such other  business as may properly  come
before the meeting or any adjournment(s) thereof.

         If the proposal to increase the authorized  Common Stock to 100,000,000
shares is approved by  Positron's  shareholders,  Positron will issue 51% of the
outstanding Common Stock to Imatron Inc. in return for working capital financing
and support of Positron's  marketing program (the "Imatron  Transaction").  Your
Board of Directors has determined that the Imatron Transaction is fair to and in
the best interests of Positron and its shareholders. Your Board of Directors has
unanimously  approved the Imatron  Transaction  and recommends that you vote FOR
the increase of the authorized shares of Common Stock to 100,000,000 shares.

         The  proposals  to be voted on at the Annual  Meeting are  described in
greater detail in the accompanying Proxy Statement,  which you are urged to read
carefully and in its entirety.

         Directors  are elected by a plurality of the voting power of the Common
Stock and the Series A  Preferred  Stock  voting  together  as one class that is
represented  in person or by proxy and  entitled to vote at the Annual  Meeting.
The proposal to amend the  Articles of  Incorporation  requires the  affirmative
vote of two-thirds of the  outstanding  voting power of the Common Stock and the
Series A Preferred  Stock voting  together as one class.  The proposal to ratify
the  selection of auditors  requires the  affirmative  vote of a majority of the
voting  power of the  Common  Stock  and the  Series A  Preferred  Stock  voting
together  as one class  that is present  in person or by proxy and  entitled  to
vote.

         We urge you to consider these important matters, which are described in
the enclosed Proxy  Statement.  In order to ensure that your vote is represented
at the Annual  Meeting,  whether  or not you plan to attend the Annual  Meeting,
please  indicate your choice on the enclosed  proxy card,  date and sign it, and
return  it in the  enclosed  envelope.  Your  prompt  response  will be  greatly
appreciated.  If you are able to attend the Annual Meeting,  you may revoke your
proxy at any time before its  exercise  and may, of course,  vote your shares in
person.

                                         Sincerely,

                                         Gary B. Wood
                                         Chairman of the Board of Directors
                                         ----------------------------------

         THE BOARD OF DIRECTORS OF POSITRON  RECOMMENDS THAT  SHAREHOLDERS  VOTE
FOR ALL OF THE PROPOSALS LISTED ABOVE TO BE PRESENTED AT THE ANNUAL MEETING.

         PLEASE MARK, SIGN, DATE AND RETURN YOUR PROXY CARD PROMPTLY, WHETHER OR
NOT YOU PLAN TO ATTEND THE ANNUAL MEETING. YOUR PROXY WILL BE REVOCABLE,  EITHER
IN WRITING OR BY VOTING IN PERSON AT THE  ANNUAL  MEETING,  AT ANY TIME PRIOR TO
ITS EXERCISE.

                                              YOUR VOTE IS IMPORTANT
                                   PLEASE VOTE, SIGN, DATE AND RETURN YOUR PROXY
<PAGE>
                              POSITRON CORPORATION
                            1304 Langham Creek Drive
                                    Suite 310
                              Houston, Texas 77084

                    NOTICE OF ANNUAL MEETING OF SHAREHOLDERS

                          To Be Held December 18, 1998

         Notice is hereby  given that the  Annual  Meeting  of  Shareholders  of
Positron  Corporation,  a Texas  corporation  (the  "Company"),  will be held at
Positron  Corporation,  1304 Langham Creek Drive, Suite 310, Houston,  Texas, on
December 18, 1998, at 10:00 a.m.  Central  Standard Time (the "Annual  Meeting")
for the following purposes:

                   (i)     To elect one director;

                   (ii)    To  consider  and act upon a proposal of the Board of
                           Directors to amend the Articles of  Incorporation  to
                           increase the authorized  Common Stock, par value $.01
                           per share, of the Company from  15,000,000  shares to
                           100,000,000 shares;

                   (iii)   To ratify the designation of Ham, Langston & Brezina,
                           L.L.P.  as  independent  auditors for the fiscal year
                           ended December 31, 1997; and

                   (iv)    To transact such other  business as may properly come
                           before the meeting or any adjournment(s) thereof.

         The accompanying Proxy Statement contains information regarding,  and a
more  complete  description  of, the items of business to be  considered  at the
meeting.

         Only  shareholders  of record at the close of business on November  10,
1998,  are  entitled  to  notice  of,  and to vote at,  the  Annual  Meeting  of
Shareholders or any adjournment(s) thereof.

         You are cordially  invited and urged to attend the meeting,  but if you
are unable to attend,  you are requested to sign and date the accompanying proxy
and return it promptly in the enclosed  self-addressed  envelope.  If you attend
the  meeting,  you may vote in  person,  if you  wish,  whether  or not you have
returned your proxy.  In any event, a proxy may be revoked at any time before it
is exercised.


                                              By Order of the Board of Directors


                                              Gary B. Wood
                                              Secretary

Houston, Texas
November 24, 1998

         IT IS IMPORTANT  THAT YOUR SHARES BE  REPRESENTED AT THE ANNUAL MEETING
IN ORDER THAT THE  PRESENCE OF A QUORUM MAY BE ASSURED.  IF YOU DO NOT EXPECT TO
ATTEND THE MEETING,  PLEASE COMPLETE AND SIGN THE ACCOMPANYING FORM OF PROXY AND
RETURN IT IN THE  ENCLOSED  ENVELOPE.NO  POSTAGE  IS  REQUIRED  IF MAILED IN THE
UNITED STATES.
<PAGE>
                              POSITRON CORPORATION
                            1304 Langham Creek Drive
                                    Suite 310
                              Houston, Texas 77084


                                 PROXY STATEMENT

                                       For

                         ANNUAL MEETING OF SHAREHOLDERS

                          To Be Held December 18, 1998


         This Proxy Statement is sent to shareholders of Positron Corporation, a
Texas  corporation  (the  "Company"),  in connection  with the  solicitation  of
proxies by the Board of Directors of the Company (the "Board of Directors")  for
use at the Annual Meeting of Shareholders of the Company, and any adjournment(s)
thereof (the "Annual  Meeting"),  to be held on December 18, 1998, at 10:00 a.m.
Central Standard Time at Positron  Corporation,  1304 Langham Creek Drive, Suite
310,  Houston,  Texas, for the purposes set forth in the accompanying  Notice of
Annual Meeting of Shareholders. Solicitation of proxies may be made in person or
by mail, telephone,  or telegraph by directors,  officers, and regular employees
of the Company.  The Company may also request  banking  institutions,  brokerage
firms, custodians, nominees and fiduciaries to forward solicitation materials to
the beneficial  owners of shares of common stock,  par value $.01 per share (the
"Common Stock"), of the Company held of record by such persons,  and the Company
will  reimburse  the  forwarding  expenses.  In  addition,  Positron has engaged
Innisfree M&A  Incorporated to assist in the  solicitation of proxies.  Positron
anticipates  that it will incur total fees of approximately  $6,500,  plus $5.50
per  telephone  call  that  Innisfree  makes  to  or  receives  from  individual
shareholders,  plus  reimbursement  of certain  out-of-pocket  expenses for this
service. The cost of solicitation of proxies will be paid by the Company.

         The  approximate  date on which this Proxy  Statement  and the enclosed
form of proxy are first being sent to shareholders is November 24, 1998.

         The Annual Report to  Shareholders  covering the Company's  fiscal year
ended December 31, 1997 ("Fiscal 1997"), including audited financial statements,
and the Quarterly Report on Form 10-QSB for the Period Ended September 30, 1998,
are enclosed herewith.

                                        1
<PAGE>
                               THE ANNUAL MEETING

Date, Time, and Place of the Annual Meeting

         The Annual  Meeting will be held on December  18,  1998,  at 10:00 a.m.
Central Standard Time at Positron  Corporation,  1304 Langham Creek Drive, Suite
310, Houston, Texas.

Record Date and Shares Entitled to Vote

         The voting securities of the Company are shares of its Common Stock and
its Series A 8% Cumulative Convertible Redeemable Preferred Stock (the "Series A
Preferred  Stock").  Holders of shares of Common Stock are each  entitled to one
vote on each matter to be voted upon.  Voting with the Common Stock,  each share
of Series A Preferred  Stock  entitles the holder thereof to the number of votes
equal to the number of shares of Common Stock (including fractional shares) into
which such shares of Series A Preferred Stock could be converted. On October 30,
1998,  there were  5,159,592  shares of Common Stock  outstanding  and 1,564,403
shares of Series A Preferred  Stock  outstanding  which could be converted  into
1,564,403  shares of Common Stock.  Only  shareholders of record at the close of
business  on November  10,  1998 are  entitled to notice of, and to vote at, the
Annual Meeting.  Cumulative voting is not permitted in the election of directors
of the Company.

Revocation of Proxy

         Any shareholder  returning the accompanying proxy may revoke such proxy
at any time prior to its exercise:  (i) by giving  written notice to the Company
of such revocation;  (ii) by voting in person at the Annual Meeting; or (iii) by
executing and delivering to the Company a later dated proxy.

Voting of Proxies

         Proxies in the  accompanying  form, if properly  executed and returned,
will be voted at the Annual Meeting in accordance with the instructions thereon.
Any proxy upon which no instructions  have been indicated with respect to any of
the  following  matters will be voted as follows:  (i) "FOR" the election of the
person  named in this Proxy  Statement  as the Board of  Directors'  nominee for
election  to the  Board of  Directors;  (ii)  "FOR"  the  proposal  to amend the
Articles of  Incorporation  to increase the shares of  authorized  Common Stock;
(iii) "FOR" the  ratification  of the  appointment  of Ham,  Langston & Brezina,
L.L.P.,  as  independent  auditors for the fiscal year ending  December 31, 1998
("Fiscal  1998");  and (iv) in accordance  with the discretion of the holders of
such proxies with respect to any other  business that properly  comes before the
shareholders at the Annual Meeting.  The Board of Directors knows of no matters,
other than those stated above, to be presented for  consideration  at the Annual
Meeting. If, however,  other matters properly come before the Annual Meeting, it
is the  intention of the persons  named in the  accompanying  proxy to vote such
proxy in accordance  with their judgment on any such matters.  The persons named
in the accompanying  proxy may also, if it is deemed to be advisable,  vote such
proxy to adjourn the Annual Meeting from time to time.

         Broker  non-votes  with  respect  to the  amendment  to  the  Company's
Articles of Incorporation will be treated as "no" votes.

Quorum and Voting

         The  presence,  in person or by proxy,  of the holders of a majority of
the outstanding  shares of Common Stock and Series A Preferred Stock entitled to
vote is necessary to constitute a quorum at the Annual  Meeting.  If a quorum is
not present or represented at the Annual Meeting,  the shareholders  entitled to
vote  thereat,  present  in person or  represented  by proxy,  have the power to
adjourn  the Annual  Meeting  from time to time,  without  notice  other than an
announcement at the Annual Meeting, until a quorum is present or represented. At
any such adjourned  Annual Meeting at which a quorum is present or  represented,
any business may be transacted  that might have been  transacted at the original
Annual Meeting.

         Abstentions may be specified on all proposals  (other than the election
of directors) and will be counted towards a quorum. With respect to the election
of directors, votes may be cast in favor or withheld.

                                        2
<PAGE>
         Brokers who hold shares in street name for  customers  are  required to
vote those shares in accordance with  instructions  received from the beneficial
owners. In addition,  brokers are entitled to vote on certain items, such as the
election of directors,  the  ratification  of auditors and other  "discretionary
items" even when they have not received  instructions  from  beneficial  owners.
Brokers are not permitted to vote (a "broker non-vote") for  "non-discretionary"
items without specific instructions from the beneficial owners. Broker non-votes
will be  counted as shares as to which  voting  power has been  withheld  by the
beneficial owner and,  therefore,  as shares not entitled to vote on the item as
to which there is a broker non-vote.

Vote Required

         Directors  are elected by a plurality of the voting power of the Common
Stock and the Series A  Preferred  Stock  voting  together  as one class that is
represented  in person or by proxy and  entitled to vote at the Annual  Meeting,
and votes that are  withheld  will be excluded  entirely  from the vote and will
have no effect. The proposal to amend the Articles of Incorporation requires the
affirmative  vote of  two-thirds of the  outstanding  voting power of the Common
Stock and the  Series A  Preferred  Stock  voting  together  as one  class.  The
proposal to ratify the selection of auditors  requires the affirmative vote of a
majority  of the  voting  power of the Common  Stock and the Series A  Preferred
Stock  voting  together  as one class  that is present in person or by proxy and
entitled to vote.  Abstentions  with respect to the amendment of the Articles of
Incorporation  and  ratification  of the auditors will have the same effect as a
negative vote.

         Broker  non-votes  with  respect  to the  amendment  to  the  Company's
Articles of Incorporation will be treated as "no" votes.

Solicitation of Proxies and Expenses

         Solicitation of proxies may be made in person or by mail, telephone, or
telegraph by  directors,  officers,  and regular  employees of the Company.  The
Company may also request  banking  institutions,  brokerage  firms,  custodians,
nominees,  and fiduciaries to forward  solicitation  materials to the beneficial
owners of Common  Stock of the Company held of record by such  persons,  and the
Company will  reimburse  the  forwarding  expenses.  In  addition,  Positron has
engaged  Innisfree M&A  Incorporated  to assist in the  solicitation of proxies.
Positron anticipates that it will incur total fees of approximately $6,500, plus
$5.50 per telephone  call that  Innisfree  makes to or receives from  individual
shareholders,  plus  reimbursement  of certain  out-of-pocket  expenses for this
service. The cost of solicitation of proxies will be paid by the Company.

Dissenters' Rights

         Under Texas law,  the  holders of Common  Stock will not be entitled to
any dissenters'  rights in connection with the increase of authorized  shares of
Common Stock available for issuance, as described in Proposal Two below.

                      PROPOSAL ONE -- ELECTION OF DIRECTOR

         Pursuant to the Company's bylaws,  the Board of Directors has fixed the
number of directors  at four.  All  directors'  terms expire this year as of the
election  of  directors  at the  Annual  Meeting.  The term of  office  for each
director  shall be for the  ensuing  year or until a  successor  is elected  and
qualified,  and will expire  concurrently  with the election of directors at the
1999 Annual Meeting.  Immediately prior to the Annual Meeting, it is anticipated
that the Board of  Directors  will amend the  Company's  bylaws to decrease  the
number of  directors  to three.  At that time,  K. Lance  Gould,  M.D.,  John H.
Laragh, M.D. and Ronald B. Schilling,  Ph.D., will resign as directors,  leaving
Gary B. Wood, Ph.D. as the sole remaining director of the Company.

         In May 1998,  the  Company  entered  into an  agreement  (the  "Imatron
Agreement")  with  Imatron  Inc.  of South San  Francisco  ("Imatron"),  whereby
Imatron  will  acquire  a  majority  ownership  of  the  Company  (the  "Imatron
Transaction").  The Imatron  Agreement  contemplates  that,  effective  upon its
consummation,  Dr. Wood will appoint S. Lewis Meyer, Ph.D, and Gary H. Brooks to
fill the  vacancies  on the Board of  Directors.  Dr.  Meyer and Mr.  Brooks are
nominees of Imatron. For a detailed description of the Imatron Transaction,  see
"Proposal to Amend the Company's  Articles of Incorporation  and to Increase the
Number of Authorized  Shares of Common Stock  Available for Issuance -- Terms of
the Imatron Transaction."

                                        3
<PAGE>
         The  proposal at the Annual  Meeting  will be to reelect  Gary B. Wood,
Ph.D. as the sole director of the Company.  Dr. Wood, 48, has served as director
and  Chairman of the Board of Directors  of the Company  since April 1990.  From
October 1, 1994 to December 31, 1995 and since  February 17, 1997,  he has acted
as President and Chief Executive Officer of the Company pending the selection of
a new President and Chief Executive Officer.  Upon the resignation of Dr. Werner
J. Haas in February  1997,  Dr. Wood again  assumed the duties of President  and
Chief  Executive  Officer  pending the  selection of a new  President  and Chief
Executive Officer. He is President of Concorde Financial Corporation,  a private
investment  management and  consulting  firm which he founded in 1981 and is the
founder, chairman and a principal shareholder of OmniMed Corporation,  a venture
capital  investment  firm  founded in 1986.  Dr.  Wood is also the  founder  and
Chairman  of Uro-Tech  Management  Corporation  (a wholly  owned  subsidiary  of
OmniMed)  founded in 1983. Both OmniMed and Uro-Tech  specialize in investing in
the biotechnology and healthcare industries. Dr. Wood holds a B.S. degree and an
M.S.  degree in  Electrical  Engineering  (with  special  emphasis in Biomedical
Instrumentation),  and an  interdisciplinary  Doctorate of Philosophy from Texas
Tech  University.  Certain of the entities  controlled by Dr. Wood are principal
shareholders  of the  Company.  OmniMed  holds  15,280  shares of Common  Stock.
Uro-Tech  holds 433,329  shares of Series A Preferred  Stock,  424,787 shares of
Common Stock and warrants to purchase 514,190 shares of Common Stock.

         Dr. Wood has consented to his  nomination  for election to the Board of
Directors.  Should Dr. Wood become  unable due to death or  disability to accept
nomination or election,  it is intended that the persons  acting under the proxy
will vote for the election,  in his stead,  of such other person as the Board of
Directors  may  recommend.  The Board of Directors has no reason to believe that
Dr. Wood will be unable to serve if elected.

         The Board of Directors  recommends a vote FOR the election to the Board
of Gary B. Wood, Ph.D.

                    PROPOSAL TWO --AMENDMENT TO THE COMPANY'S
                ARTICLES OF INCORPORATION TO INCREASE THE NUMBER
           OF AUTHORIZED SHARES OF COMMON STOCK AVAILABLE FOR ISSUANCE

General

         The  Company,  under  its  Articles  of  Incorporation,   is  presently
authorized to issue  10,000,000  shares of Preferred  Stock, par value $1.00 per
share,  and 15,000,000  shares of Common Stock,  par value $.01 per share. As of
the date of this proxy,  there are 1,564,403  shares of Series A Preferred Stock
outstanding,  25,000  shares of Series B 8%  Cumulative  Convertible  Redeemable
Preferred Stock (the "Series B Preferred Stock")  outstanding,  5,159,592 shares
of Common Stock  outstanding  and 9,840,408  shares of Common Stock reserved for
issuance.

The Amendment

         The proposed amendment would amend the first paragraph of Article IV of
the Articles of Incorporation to read:

                  The total  number of shares of all  classes  of stock that the
         corporation  shall be authorized  to issue is  110,000,000  shares,  of
         which 10,000,000  shares of the par value of $1.00 per share shall be a
         class designated as Preferred Stock("Preferred Stock"); and 100,000,000
         shares of the par value $.01 per share shall be designated Common Stock
         ("Common Stock").

         The proposed amendment to the Company's Articles of Incorporation would
increase the total number of authorized  shares of Common Stock from 15,000,0000
shares to 100,000,000 shares.  Shares of the Common Stock do not have preemptive
rights

Reasons for the Amendment and Interests of Certain Persons

         The Company does not have sufficient  authorized but unissued shares to
cover  all of its  current  commitments.  In order to  complete  the sale of the
Series B Preferred  Stock,  the  Company was  required to enter into a series of
forbearance   agreements  (the  "Forbearance   Agreements").   Pursuant  to  the
Forbearance Agreements, holders of options and warrants that are exercisable for
shares of Common  Stock have agreed not to exercise or convert,  as  applicable,
into  Common  Stock any of their  securities  until the  Company has amended its
Articles of  Incorporation  to increase its authorized  Common Stock by at least
2,500,000  shares or such  greater  number  of shares of Common  Stock so that a
sufficient  number  of  shares  of Common  Stock  are  available  to permit  the
conversion  or  exercise of their  securities.  In  connection  with the Imatron

                                        4
<PAGE>
Transaction  discussed  below,  the Company  will require a minimum of 9,000,000
shares  of  Common  Stock.  For  a  more  detailed  discussion  of  the  Imatron
Transaction  and the  securities to be issued in connection  therewith,  see "--
Terms of the Imatron  Transaction."  The Board of Directors  believes  that,  in
addition  to shares  sufficient  to cover its  current  commitments  and  shares
issuable in  connection  with the Imatron  Transaction,  having such  additional
shares available for issuance to meet possible future  development and financing
requirements  would be  advantageous  to the Company,  and avoid the expense and
delay of calling a special meeting of the  shareholders to secure  authorization
each time a specific need arises.  Among the purposes for which such  additional
authorized but unissued  shares of stock could be used would be the  acquisition
of  complimentary  technology,  employee  compensation,  fund  expansion and the
raising  of funds  for  general  corporate  purposes.  Other  than  the  Imatron
Transaction,  no other specific  transactions  are currently  contemplated  that
would result in the issuance of additional shares.

Vote Required and  Recommendation  for Approval of the Proposed Amendment to the
Company's Articles of Incorporation.

         To be approved by the  Company's  shareholders,  the  amendment  to the
Articles  of  Incorporation  must  receive  the  approval of holders of at least
two-thirds  of the voting  power of the Common  Stock and the Series A Preferred
Stock voting together as one class.  The enclosed form of proxy provides a means
for shareholders to vote for the amendment,  to vote against the amendment or to
abstain from voting on the amendment.  Each properly  executed proxy received in
time for the Annual Meeting will be voted as specified therein. If a shareholder
executes  and  returns  a proxy  but  does not  specify  otherwise,  the  shares
represented by such shareholder's proxy will be voted "FOR" the amendment.

Recommendations  of the Board of Directors  and Reasons for the Amendment to the
Articles of Incorporation

         The Board of Directors  determined that the Imatron Agreement is in the
best interest of the Company's securityholders and recommends that the Company's
shareholders  vote in favor of  ratifying  and  approving  the  amendment to the
Articles of Incorporation.

Terms of the Imatron Transaction

         The Imatron Agreement

         The  following  is a  summary  of the  material  terms  of the  Imatron
Agreement. This summary is qualified in its entirety by reference to the Imatron
Agreement, a copy of which is attached hereto as Annex A. Capitalized terms used
herein and not otherwise defined shall have the meanings ascribed to them in the
Imatron  Agreement.  Shareholders are urged to read the Imatron Agreement in its
entirety.

         In May 1998, the Company  entered into the Imatron  Agreement,  whereby
Imatron will acquire control of the Company.  In conjunction  with the execution
of  definitive  agreements,   Imatron  began  making  working  capital  advances
available to the Company up to $500,000  (subsequently revised by oral agreement
to $750,000) in order to enable it to meet a portion of its current obligations.
As of September  30, 1998,  the Company had  borrowed  $568,000.  The loan bears
interest at 1/2% over the prime rate, is due March 1, 2000 (with  interest being
payable monthly), and is secured by all of the Company's assets.

         Under the terms of the agreement, Imatron will acquire ownership of 51%
of the  outstanding  Common  Stock of the Company on a  fully-diluted  and as-if
converted basis, which assumes that all outstanding warrants,  options and other
derivatives  have been  exercised or converted into shares of Common Stock other
than out-of-the-money  warrants and options,  determined at the time of issuance
of shares of Common  Stock to Imatron.  If such shares were issued to Imatron on
September  30, 1998,  the Company would have been  obligated to issue  9,000,000
shares of Common Stock.  The Company will receive a nominal cash payment of $100
from Imatron in payment for the shares of Common Stock.

         In addition to providing limited working capital financing, Imatron has
agreed to support the Company's  marketing program,  particularly with regard to
Imatron's affiliate, Imatron Japan, Inc. ("Imatron Japan"), by agreeing to make,
after the share  issuance  closing  date,  all  reasonable  efforts to cause the
placement of 10 POSICAM(TM)  positron emission  tomography  ("PET") cameras over
the next three years.  The Company  recently shipped a POSICAM(TM) PET camera to
Imatron Japan as the first  delivery under a three-year  distribution  agreement
entered  into last year.  Imatron  Japan is a major  distributor  for  Imatron's
Ultrafast CT and for the equipment of certain other high  technology  companies.
Imatron has a 24% minority interest in Imatron Japan. Imatron has also agreed to
help facilitate the recapitalization of the Company to support its re-entry into
                                        5
<PAGE>
the medical  imaging  market by using its best efforts after the share  issuance
closing date to arrange for  additional  third-party  equity  financing  for the
Company  over an  18-month  period  in an  aggregate  amount  of not  less  than
$8,000,000.  There  can be no  assurances,  however,  that any such  sales  will
actually be consummated or that Imatron will be able to successfully  assist the
Company in raising additional capital.

         Consummation of the issuance of shares to Imatron is conditioned  upon,
among other things (a) the  resignation of each officer of the Company,  (b) the
resignation  of at least three of the four current  directors of the Company and
the  appointment  of  Imatron's  nominees  to  fill  such  vacancies,   and  (c)
shareholder  approval of an amendment to the Company's Articles of Incorporation
to increase its authorized Common Stock to at least 100,000,000 shares of Common
Stock.  The Company  anticipates  that the share  issuance to Imatron will close
immediately  after the Annual  Meeting if the required  shareholder  approval is
obtained.

         In connection with the above transactions, the Company, Imatron and two
current  lenders to the Company,  Uro-Tech,  Ltd.  ("Uro-Tech")  and  ProFutures
Bridge  Capital  Fund,  L.P.  ("ProFutures"),  entered into  certain  agreements
whereby (a) ProFutures waived all past defaults and extended the maturity of its
loan (with a current balance of approximately  $570,000) (the "ProFutures Loan")
to December 5, 1998, in return for a $50,000  payment,  the issuance of warrants
to purchase  1,150,000 shares of Common Stock at $0.25 per share (in addition to
the issuance of  previously  bargained  for  warrants to purchase an  additional
100,000 shares of Common Stock at $0.25 per share),  and minimum loan repayments
of $50,000 for each of the months of April,  May,  June and July 1998,  $100,000
for the month of August 1998 and  $50,000  for each of the months of  September,
October and November 1998,  (b) Imatron  agreed to  subordinate  its loan to the
ProFutures  Loan, (c) Uro-Tech  agreed to  subordinate  its loan (with a current
balance of approximately $767,000 plus accrued interest payable of approximately
$286,000) to Imatron's  loan,  and (d)  ProFutures  and Imatron  agreed that all
amounts above the first $1,000,000 of any third-party  equity financing obtained
by  Imatron  would be  applied  equally  to reduce  the  Company's  debt to both
ProFutures  and  Imatron.  Consistent  with the oral  amendment  to the  Imatron
Agreement,  the Company and ProFutures have amended their  agreements to provide
further  waivers of any past defaults and have further  extended the maturity of
the ProFutures  Loan to December 5, 1998 and minimum loan  repayments of $50,000
for each of the  months of  September,  October  and  November  1998,  leaving a
balance  at  December  5,  1998 of  approximately  $400,000.  Imatron  agreed to
continue to subordinate its loan to the ProFutures  Loan, and Uro-Tech agreed to
subordinate  its loan to Imatron's  loan.  Except as modified by the amendments,
the remaining agreements remain the same.

         The Company is in negotiations  to sell one of its POSICAM(TM)  systems
to a third party that currently  leases the system.  It is anticipated  that, if
the  Company is  successful  in  consummating  such sale,  it will  receive  net
proceeds of approximately  $360,000.  It is the Company's  intention to use such
proceeds,  plus proceeds from a service contract currently being negotiated with
the third party, to retire the remaining  balance of  approximately  $400,000 on
the ProFutures Loan. There can be no assurances,  however, that the Company will
be successful in reaching an agreement  concerning  the proposed  system sale or
that,  if  agreement  is  reached,  such sale will be  consummated,  or that the
Company  otherwise will be able to obtain  additional  debt or equity  financing
necessary to repay the ProFutures Loan by such maturity date. Absent obtaining a
further  extension of the December 5, 1998 maturity date of the ProFutures Loan,
closing the proposed sale of the  POSICAM(TM)  system,  or obtaining  additional
debt or equity financing  necessary to repay the ProFutures Loan by the maturity
date, the Company may be forced to seek protection under the Federal  Bankruptcy
laws.

         If Proposal Two to amend the Company's Articles of Incorporation is not
approved by the Company's shareholders,  or if such proposal is approved but the
Imatron  Transaction does not  subsequently  close, the Company may be forced to
seek protection under the Federal Bankruptcy laws. Even if Proposal Two to amend
the Company's Articles of Incorporation is approved and the Imatron  Transaction
closes,  there can be no assurances  that the Company will thereafter be able to
raise sufficient  capital for the Company to continue as a going concern or even
if such  additional  capital is raised  that the Company  will ever  achieve the
level of revenues needed to be profitable in the future, or, if profitability is
achieved, that it will be sustained.

         Shareholders  of the  Company  should  be  aware  that if they  vote to
approve Proposal Two to amend the Company's Articles of Incorporation,  they may
be estopped from  asserting a cause of action against the Company or against the
Board of Directors of the Company challenging the sale of control of the Company
to Imatron.

                                       6
<PAGE>
         Dilutive Effect

         If the  amendment to the Articles of  Incorporation  is approved by the
Company's shareholders, and if the Imatron Transaction subsequently closes, then
each  existing  shareholder's   ownership  percentage  of  Common  Stock  (on  a
fully-diluted  and as-if  converted  basis,  which assumes that all  outstanding
warrants,  options and other  derivatives  have been exercised or converted into
shares of Common Stock other than out-of-the-money warrants and options) will be
reduced by 51%. In such case, assuming that the Imatron Transaction closed as of
September 30, 1998, each existing  shareholder's  ownership percentage of Common
Stock (on an outstanding basis, which ignores all outstanding options,  warrants
and other  derivatives)  would be  reduced by  approximately  64%.  The  Imatron
Transaction,  therefore,  will be dilutive to the ownership  position and voting
rights associated with the existing shareholders' ownership of Common Stock.

         Accounting Treatment

         Consummation  of the Imatron  Transaction  will be  accounted  for as a
purchase  for  financial  accounting  purposes.   For  presentation  of  certain
anticipated  effects of the accounting  treatment on the consolidated  financial
position  and  results of  operations  of the  Company  after  giving  effect to
consummation  of the  Imatron  Agreement,  see  "Unaudited  Pro Forma  Financial
Statements of Operations."

         Additional Information Concerning Positron and Imatron

         Additional  information concerning Positron and Imatron may be obtained
as described in the paragraph below.

         Positron and Imatron are subject to the  informational  requirements of
the  Securities  Exchange Act of 1934 (the  "Exchange  Act") and, in  accordance
therewith,  file periodic  reports,  proxy statements and other information with
the  Securities and Exchange  Commission  (the  "Commission")  relating to their
respective  businesses,  financial statements and other matters.  Reports, proxy
statements and other  information filed by Positron and Imatron can be inspected
and copied at the public  reference  facilities  maintained by the Commission at
Room 1024, 450 Fifth Street, N.W., Judiciary Plaza, Washington,  D.C. 20549, and
at the Commission's  Regional  Offices at Seven World Trade Center,  13th Floor,
New York, New York 10048 and CitiCorp  Center,  500 West Madison  Street,  Suite
1400, Chicago,  Illinois 60661-2511.  Copies of such material can be obtained by
mail from the  Public  Reference  Section  of the  Commission  at 450 West Fifth
Street, N.W.,  Washington,  D.C. 20549, at prescribed rates. The Commission also
maintains a web site that contains reports, proxy and information statements and
other information  regarding Positron and Imatron.  The address of that web site
is  http://www.sec.gov.   In  addition,  reports,  proxy  statements  and  other
information  concerning  Imatron may be  inspected  at the offices of the Nasdaq
National Market, 1735 K Street, N.W., Washington, D.C. 20006.

         PROPOSAL TO RATIFY SELECTION OF INDEPENDENT PUBLIC ACCOUNTANTS

         On April 7, 1998, Coopers & Lybrand L.L.P. (the "Former  Accountants"),
by means of a letter  addressed to the Chairman of the Board and Chief Executive
Officer  of the  Company,  informed  the  Company  that it had  resigned  as the
Company's  independent   auditors.   The  resignation  arises  from  the  Former
Accountants'  desire to terminate its  relationship  with the Company because of
the Company's current financial condition.

         There was no adverse opinion or disclaimer of opinion, or qualification
or  modification as to  uncertainty,  audit scope, or accounting  principles for
either of the  Company's  past two years  except,  (i) the  Former  Accountants'
report on the financial  statements of the Company as of and for the years ended
December 31, 1996 contained a separate  paragraph  stating that "the Company has
suffered  recurring losses from operations and has a net capital deficiency that
raises  substantial  doubt about its  ability to  continue  as a going  concern.
Management's  plans in regard to these matters are also described in Note 1. The
financial  statements do not include any adjustments  that might result from the
outcome of this  uncertainty"  and (ii) the financial  statements of and for the
fiscal year ended December 31, 1997 have not been audited.

         This  decision  to resign  was made by the Former  Accountants  and was
neither approved nor disapproved by the Board of Directors.

                                        7
<PAGE>
         During the two most recent fiscal  periods ended  December 31, 1997 and
December 31, 1996 and from December 31, 1997 until April 7, 1998, (i) there were
no disagreements between the Company and the Former Accountants on any matter of
accounting principles or practice,  financial statement disclosure,  or auditing
scope or procedure,  which  disagreements if not resolved to the satisfaction of
the Former  Accountants  would have caused it to make  reference  thereto in its
report  and (ii)  there  were no  reportable  events  as  defined  in  paragraph
304(a)(1)(v) of Regulation S-K promulgated under the Securities Act of 1933.

         On June 26, 1998, the Company engaged Ham,  Langston & Brezina,  L.L.P.
("Ham  Langston") as its new independent  accountants as successor to the Former
Accountants.

         The Board of Directors has selected Ham Langston to act as  independent
auditors for the fiscal year ending  December 31, 1998,  subject to  shareholder
approval. If the shareholders do not ratify this appointment, the appointment of
other independent accountants will be considered by the Board of Directors.

         Ham Langston has advised the Company that it will have a representative
in attendance at the Annual Meeting with the opportunity to make a statement, if
such  representative  desires to do so, and to respond to appropriate  questions
presented at the Annual Meeting.

         The  ratification  of the  appointment  of Ham  Langston  requires  the
approval  of a  majority  of the  outstanding  shares of Common  Stock  that are
present  at the  Annual  Meeting  in  person or by proxy  and  entitled  to vote
thereon.

         The Board of Directors recommends a vote FOR the proposal to ratify the
appointment  of Ham  Langston  as  independent  accountants  for the Company for
Fiscal 1998.

                        DIRECTORS AND EXECUTIVE OFFICERS

Information Regarding Current Directors

 Name                       Age               Position          

 Gary B. Wood, Ph.D.         48               Director, Interim President, Chief
                                              Executive Officer and Secretary

 K. Lance Gould, M.D.        57               Director

 John H. Laragh, M.D.        69               Director

 Ronald B. Schilling, Ph.D.  56               Director

         Gary B. Wood,  Ph.D.,  48, has served as director  and  Chairman of the
Board of  Directors  of the Company  since April 1990.  From  October 1, 1994 to
December 31, 1995 and since  February 17,  1997,  he has acted as President  and
Chief Executive  Officer of the Company pending the selection of a new President
and Chief  Executive  Officer.  Upon the  resignation  of Dr.  Werner J. Haas in
February  1997,  Dr.  Wood  again  assumed  the  duties of  President  and Chief
Executive  Officer  pending the selection of a new President and Chief Executive
Officer. He is President of Concorde Financial Corporation, a private investment
management  and  consulting  firm which he  founded in 1981 and is the  founder,
chairman and a principal  shareholder of OmniMed Corporation,  a venture capital
investment  firm  founded in 1986.  Dr. Wood is also the founder and Chairman of
Uro-Tech  Management  Corporation (a wholly owned subsidiary of OmniMed) founded
in 1983. Both OmniMed and Uro-Tech  specialize in investing in the biotechnology
and  healthcare  industries.  Dr.  Wood  serves as a director  of Harken  Energy
Corporation.  Dr.  Wood  holds a B.S.  degree and an M.S.  degree in  Electrical
Engineering  (with  special  emphasis  in  Biomedical  Instrumentation),  and an
interdisciplinary Doctorate of Philosophy from Texas Tech University. Certain of
the entities  controlled by Dr. Wood are principal  shareholders of the Company.
OmniMed holds 15,280 shares of Common Stock.  Uro-Tech  holds 433,329  shares of
Series A  Preferred  Stock,  424,787  shares of Common  Stock  and  warrants  to
purchase 514,190 shares of Common Stock.

Information  Regarding  Directors to Fill  Vacancies  Upon  Consummation  of the
Imatron Transaction
                                        8
<PAGE>
         If the Imatron  Transaction is consummated,  it is anticipated that Dr.
Wood will appoint the following  two Imatron  designees to fill the vacancies on
the Board of Directors.

         S. Lewis Meyer, 53, was appointed  President,  Chief Executive  Officer
and Director of Imatron in June 1993. From April 1991 until joining Imatron,  he
was Vice  President,  Operations  of  Otsuka  Electronics  (U.S.A.)  Inc.,  Fort
Collins,  Colorado,  a manufacturer of clinical  magnetic  resonance systems and
analytical nuclear magnetic resonance  spectrometers.  From August 1990 to April
1991, he was a founding partner of Medical Capital Management, a company engaged
in providing  consulting  services to medical equipment  manufacturers,  imaging
service  providers  and related  medical  professionals.  Mr.  Meyer serves as a
director of BSD Medical Corp. and Finet Holdings Corp.,  which are publicly held
companies engaged in the design and manufacture of medical hypothermia equipment
and electronic  real estate and mortgage  banking  services,  respectively.  Mr.
Meyer also serves on the National Board of Directors of the American Electronics
Association.  Mr. Meyer received a B.S. degree in Physics from the University of
the Pacific, Stockton, California, in 1966, a M.S. degree in Physics from Purdue
University in 1968 and a Ph.D. in Physics from Purdue University in 1971.

         Gary   H.   Brooks,    49,   was    appointed    Vice    President   of
Finance/Administration,  Chief  Financial  Officer and  Secretary  of Imatron in
December 1993. Prior to joining Imatron,  Mr. Brooks was Chief Financial Officer
and  Director for five years at Avocet,  a privately  held,  sports  electronics
manufacturer   located  in  Palo  Alto,   California.   Prior  thereto,  he  had
progressively  more  responsible  positions in accounting and finance at several
Fortune 500  companies,  including  Ford,  Rockwell,  Bendix and ITT. Mr. Brooks
received his B.A. in Zoology from the  University of  California,  Berkeley,  in
1971 and an M.B.A.  in Finance and Accounting from the University of California,
Los Angeles in 1973.

Meetings and Committees of the Board of Directors

         The Board of  Directors  held four  meetings in Fiscal  1997,  and each
director  attended  at least 75% of the  aggregate  of (i) the  total  number of
meetings of the Board of Directors held during the period for which he served as
a director and (ii) the total number of meetings  held by all  committees of the
Board of Directors on which he served.

         The Board of Directors does not have a standing nominating committee or
a committee performing similar functions. Nominees to the Board of Directors are
selected by the entire Board of Directors.

         The Board of Directors has a Compensation Committee (herein so called),
which during Fiscal 1997 was composed of Dr. Wood.  The  Compensation  Committee
was  instituted in December 1993  following  the  consummation  of the Company's
initial public offering.  The Compensation  Committee  establishes  remuneration
levels  for  officers  of  the  Company,  reviews  management  organization  and
development, reviews significant employee benefit programs and has the authority
to establish and administer  executive  compensation  programs,  including bonus
plans, stock option and other equity-based programs, deferred compensation plans
and any other cash or stock incentive programs, including the 1994 Incentive and
Non-statutory Option Plan (the "1994 Plan"). The Compensation  Committee held no
meetings during Fiscal 1997.

         The Board of Directors has an Audit Committee (herein so called), which
during Fiscal 1997 was composed of Dr. Wood. The Audit  Committee was instituted
in December 1993  following the  consummation  of the Company's  initial  public
offering.  The  Audit  Committee  recommends  to  the  Board  of  Directors  the
independent  public  accountants  to be selected to audit the  Company's  annual
financial  statements  and  approves  any  special  assignments  given  to  such
accountants.  The Audit  Committee  also reviews the planned scope of the annual
audit and the  independent  accountants'  letter of  comments  and  management's
responses  thereto,  any major  accounting  changes made or contemplated and the
effectiveness  and efficiency of the Company's  internal  accounting  staff. The
Audit  Committee  will  consist  solely  of  non-employee  directors.  The Audit
Committee held no meetings during Fiscal 1997.

Executive Officers

         The  executive  officers  of the  Company  are  elected by the Board of
Directors and serve at the Board's discretion. The sole executive officer of the
Company  is Gary B.  Wood,  Ph.D,  who  serves as  Interim  President  and Chief
Executive Officer.

         Dr. Wood is currently a director of the Company.  See  "Proposal One --
Election of Director" above for additional information regarding Dr. Wood.

                                        9
<PAGE>
Executive Compensation

         The  following  tables set forth  certain  information  with respect to
compensation  paid by the Company during the years ended 1997, 1996 and 1995 and
certain information regarding stock options issued to certain of the individuals
who have acted during 1997 in the capacity of executive officers of the Company.

<TABLE>
                                             Summary Compensation Table
<CAPTION>
            (a)               (b)         (c)        (d)         (e)          (f)         (g)        (h)        (i)
                                                                          Restricted                         All Other
                                                            Other Annual     Stock     Options/              Compensa-
    Name and Principal      Fiscal      Salary      Bonus   Compensation   Award(s)      SARs       LTIP      tion(1)
         Position            Year         ($)        ($)         ($)          ($)         (#)    Payouts($)   ($)(x)
<S>                          <C>       <C>         <C>        <C>             <C>      <C>           <C>       <C> 
Gary B. Wood Ph.D.           1997       33,333                                --                     --          --
President and Chief          1996       13,750     19,800     98,000(2)       --                     --          --
Executive Officer            1995      165,000     28,333     86,083(3)       --       53,636(4)     --          --
(October 1, 1994 to December  
31, 1995 and February 1, 1997
to present)

Werner J. Haas, Ph.D.        1997        8,021
(Resigned as CEO             1996      204,800                16,600(5) 
effective February 1, 1997)  1995          N/A                                                                 2,339

<FN>
(1)      These amounts represent the Company's matching contributions under its 401(k) plan.  See "--401(k) Plan."

(2)      Represents (a) $80,000 in consulting fees paid to Dr. Wood and (b) $18,000 in directors fees.

(3)      Represents (a) $73,333 in consulting fees paid to Dr. Wood and (b) $12,750 in directors fees.

(4)      Represents  options to acquire  3,636  shares of Common  Stock  awarded
         under the 1994 Plan in 1995 and 50,000  options to acquire Common Stock
         issued in connection  with Mr. Wood's acting as interim Chief Executive
         Officer during 1995.

(5)      These amounts  represent the Company's  reimbursement of certain of Dr.
         Haas'  living  expenses  during the period he served as  President  and
         Chief Executive Officer of the Company.
</FN>
                                        10
</TABLE>
<PAGE>
<TABLE>
                                         Aggregated Option/SAR Exercises in Last Fiscal Year
                                                 and Fiscal Year-End Option/SAR Values
<CAPTION>

           (a)           (b)         (c)                (d)                             (e)
                                                Number of Unexercised        Value of Unexercised In-the-
                                               Options/SARs at Fiscal            Money Options/SARs at
                       Shares       Value            Year-End                      Fiscal Year-End
                     Acquired On   Realized  Exercisable   Unexercisable    Exercisable       Unexercisable
          Name       Exercise(#)     ($)       (#)            (#)             ($)                  ($)
- -------------------- -----------   --------  -----------   -------------    -----------       -------------
<S>                            <C>        <C>     <C>                  <C>        <C>                 <C>  
Gary B. Wood, Ph.D.            0          0       71,440               0          0 (1)               0 (1)

Werner J. Haas Ph.D.
<FN>

(1)      Based upon the exercise price in effect on December 31, 1997 and the closing price of $0.29 for the Common Stock on
         December 31, 1997, as reported on the Nasdaq National Market System.
</FN>
</TABLE>
                                       11
<PAGE>
Compensation of Directors

     The  Company  reimburses  its  directors  for  their  reasonable   expenses
associated with attending  meetings of the Board of Directors.  The Company also
compensates  each director who is not a full time employee of the Company in the
amount  of  $12,500  per  year.  The  Chairman  of the Board  also  receives  an
additional  annual  retainer of $2,000 per year and each  director  who is not a
full time  employee of the  Company  and who is a member of a  committee  of the
board receives an additional $500 per committee meeting attended,  not to exceed
$2,500 during any calendar year. Any director who is not a full time employee of
the  Company  and who is serving as the  chairman  of a  committee  of the board
receives an additional  $2,000 per year for such  services.  For purposes of the
above  described  director  compensation,  Dr.  Wood,  while  serving as interim
President  and Chief  Executive  Officer,  has not been  considered  a full time
employee of the Company.  Due to the financial liquidity problems the Company is
experiencing,  no cash payments were made to any of the directors during 1996 or
1997 for their  services as directors of the Company.  As of September 30, 1998,
approximately $540,000 was owed to directors.

     Pursuant to the 1994 Plan,  each  non-employee  director  is  automatically
granted a one-time stock option to purchase 10,500 shares of Common Stock at the
time such person is elected to the Board of Directors. In addition,  pursuant to
the 1994 Plan,  each  non-employee  director  upon his  reelection at the Annual
Meeting of  Shareholders  will  automatically  receive  an option to  purchase a
number of shares of Common  Stock  equal to the  quotient  derived  by  dividing
$15,000 by the fair market value of Common  Stock on the date of the grant.  All
options  so  granted  under  the  1994  Plan  to   non-employee   directors  are
automatically  granted  as of the first  business  day  following  the date such
person is  elected  or  reelected,  as  applicable,  as a  director  and have an
exercise price no less than the fair market value of Common Stock  determined as
of the business day preceding the date of the grant.

     One-third of the options granted to  non-employee  directors under the 1994
Plan are  exercisable  as of the date of the grant,  an additional  one-third of
such options becomes exercisable upon the first anniversary of such date and the
remaining   one-third  of  such  options  become  exercisable  upon  the  second
anniversary of such date. If a non-employee director ceases to be a director for
any reason other than as a result of death, disability or not being reelected as
a director  (in the case where such person is willing to serve as a director but
such  person has not been  renominated  for  election  or, if  renominated,  the
shareholders  failed to reelect such person as a director) then that  director's
option  will  become  void to the  extent  it is not  then  exercisable  and the
portion,  if any,  of the option  that is  exercisable  at such time will remain
exercisable  for the lesser of the remaining  term of the option or one year. In
addition,  if any  non-employee  director ceases to be a director as a result of
death,  disability or not being  reelected as a director (in the case where such
person  is  willing  to  serve  as a  director  but  such  person  has not  been
renominated for election or, if renominated,  the shareholders failed to reelect
such person as a director)  then the option held by that  director to the extent
not then  exercisable,  will become fully vested and exercisable and the options
will remain  exercisable for a period of the lesser of the remainder of the term
of the option or one year.

Employment Agreement

     On January 1, 1996, the Company  entered into an employment  agreement with
Werner J. Haas,  Ph.D.,  pursuant to which Dr. Haas agreed to serve as President
and  Chief  Executive  Officer  of the  Company  for a term  of two  years.  The
employment  agreement  provided for the payment of an annual salary of $200,000,
bonuses  in an  amount  to be  determined  at the  discretion  of the  Board  of
Directors of the Company, and participation in any employee benefit plan adopted
by the Company for its employees.

                                       12
<PAGE>
     The  employment  agreement  provided that the Company  could  terminate the
employment  agreement for cause (as defined in the agreement),  in which case no
compensation   or  benefits  would  be  paid  under  the  employment   agreement
thereafter.  If the  employment  agreement was terminated for reasons other than
for cause,  Dr.  Haas would be  entitled  to (i)  receive the full amount of his
salary and all  benefits for the  remainder  of the term and (ii) the  immediate
vesting of any unvested Company stock options he holds.

     On February  18,  1997,  Dr. Haas  informed  the Board of  Directors of the
Company that he considered  his contract to have been  terminated by the Company
without cause as a result of the Company's  failure to pay the February 15, 1997
payroll to any of its management level employees and, more specifically, to him.
Dr.  Haas has  demanded  that the Company pay him all past due salary as well as
the nine months'  severance  pay  specified in his  employment  agreement if his
contract is determined to have been terminated without cause. Additionally,  Dr.
Haas  resigned his position as a member of the Board of  Directors.  The Company
has  indicated  to Dr.  Haas that it  believes  no amounts are due him under his
employment  agreement.  As of October 30, 1997, the Company is unable to predict
the outcome of the disagreement between Dr. Haas and the Company.

     Dr. Wood assumed the duties of President and Chief  Executive  Officer upon
the resignation of Dr. Haas.

1987 Stock Option Plan

     The Company has in effect an Amended and  Restated  1987 Stock  Option Plan
(the "1987 Plan") which was adopted by the Board of Directors  and  shareholders
of the Company  effective June 1, 1987, and which was amended on March 13, 1991,
and further  amended in March 1992,  September  1992 and November 1993. The plan
currently  provides for options  exercisable for up to a total of 188,522 shares
of Common Stock. The 1987 Plan provides that incentive options which satisfy the
requirements  of Section 422 of the Internal  Revenue  Code of 1986,  as amended
(the "Code"),  may be granted to executives  and other key employees  (including
officers who may be members of the Board of  Directors)  of the Company and that
nonqualified  options may be granted to such directors,  executive employees and
other key  employees  (including  officers  who may be  members  of the Board of
Directors of the Company),  each as the Board of Directors  shall determine from
time to time.  If any options  granted  under the 1987 Plan expire or  terminate
without being exercised, the shares covered thereby are added back to the shares
reserved for issuance under the 1987 Plan.

     The Compensation  Committee of the Board of Directors  administers the 1987
Plan.  The 1987 Plan provides that options may be granted at no less than 75% of
the fair market  value of the Common  Stock on the date of the grant (or 110% of
the fair market value for options granted to participants who own 10% or more of
the Company's outstanding Common Stock).

     The Compensation Committee determines, at its discretion, the persons to be
granted options,  option prices, date of grant and vesting periods,  although no
option may extend for longer  than ten years  (five  years for  incentive  stock
options granted to 10% or greater  shareholders).  Payment of the exercise price
is made by check or in such  other  form as may be  acceptable  to the  Board of
Directors including, under certain circumstances,  the delivery of Common Stock.
No options may be granted under the 1987 Plan after June 1, 1997.

     Options are not  transferable  by the  optionee,  other than by will or the
applicable  laws of descent and  distribution.  In the event of  termination  of
employment,  the option expires on the earlier of its stated expiration or three
months (six months in the case of the  optionee's  death) after  termination  of
employment.

     In the event of a  recapitalization,  reorganization or other change in the
Company's capital structure or a merger or consolidation or the sale or transfer
of all or part of its  assets,  the 1987 Plan  provides  for  adjustment  of the
shares of Common Stock covered by the 1987 Plan and outstanding  options granted
pursuant to the 1987 Plan.

     The  1987  Plan may be  amended  at any  time by the  Board  of  Directors,
provided that amendments increasing the number of shares issuable under the 1987
Plan and  amendments  changing  the  eligibility  of  participants  require  the
approval of the holders of at least a majority of the outstanding Common Stock.

     In November  1993, the Board of Directors  canceled all of the  outstanding
options under the 1987 Plan.  Concurrently with such  cancellation,  the Company
entered into agreements with the holders of the canceled  options  providing for

                                       13
<PAGE>
the  reissuance  of such options at an exercise  price of $6.1875 per share.  In
April 1994, the Company issued options replacing the previously canceled options
and issued  additional  options for a total of 185,229 shares of Common Stock at
an exercise price of $6.1875 per share. All of such options vested on January 1,
1995.

     On February 23, 1995, the exercise price of all  outstanding  options under
the 1987 Plan was amended to reflect a new  exercise  price of $2.625 per share,
which was the market  price of the Common Stock on such date.  In  addition,  on
such date an additional  62,500  options were awarded under the 1987 Plan at the
$2.625  exercise price leaving only 12,431  options  available for future awards
under the 1987 Plan.

1994 Incentive and Non-statutory Option Plan

     On  June 3,  1994,  the  shareholders  of the  Company  approved  the  1994
Incentive and Non-statutory  Option Plan (the "1994 Plan").  The 1994 Plan is an
arrangement under which certain individuals may be granted options for incentive
stock options and  non-statutory  stock options as described  below.  Subject to
adjustment as set forth in the 1994 Plan, the aggregate  number of shares of the
Common Stock that may be the subject of awards is 610,833. Of the 610,833 shares
of Common Stock  available  under the 1994 Plan,  160,000 have been reserved for
issuance to non-employee directors. As of December 31, 1996, 345,481 options had
been granted to employees and 113,724  options had been granted to  non-employee
directors.

     The Compensation  Committee of the Board of Directors  administers the 1994
Plan. The Compensation Committee consists of directors who, except for automatic
grants for  non-employee  directors  under  Section 7 of the 1994 Plan,  are not
eligible  and  have  not,  within  one  year  prior  to the  appointment  of the
Compensation Committee, received equity securities of the Company under the 1994
Plan or any other  incentive  plan of the Company.  The  Compensation  Committee
currently consists of Dr. Wood.

     Under the 1994 Plan,  the  Compensation  Committee has wide  discretion and
flexibility,  enabling the Compensation Committee to administer the 1994 Plan in
the manner  that it  determines  is in the best  interest  of the  Company.  The
Compensation  Committee  has the  authority to designate  recipients  of options
under the 1994 Plan, to interpret  and construe the  provisions of the 1994 Plan
and  any  options  granted  thereunder,  and  to  do  all  things  necessary  or
appropriate to administer the 1994 Plan in accordance with its terms.

401(k) Plan

     The  Company has a 401(k)  Retirement  Plan and Trust (the  "401(k)  Plan")
which became effective as of January 1, 1989.  Employees of the Company who have
completed  one-quarter  year of service and have attained age 21 are eligible to
participate  in the 401(k) Plan.  Subject to certain  statutory  limitations,  a
participant may elect to have his or her  compensation  reduced by up to 20% and
have the Company contribute such amounts to the 401(k) Plan on his or her behalf
("Deferral  Contributions").  The Company makes contributions in an amount equal
to  25%  of  the  participant's  Deferral  Contributions  up to 6% of his or her
compensation ("Employer Contributions"). Additionally, the Company may make such
additional contributions as it shall determine each year in its discretion.  All
Deferral  and  Employer  Contributions  made  on  behalf  of a  participant  are
allocated to his or her individual accounts and such participant is permitted to
direct the investment of such accounts.

     A  participant  is fully vested in the current value of that portion of his
or her accounts attributable to Deferral Contributions. A participant's interest
in that portion of his or her accounts attributable to Employer Contributions is
generally fully vested after five years of employment.  Distributions  under the
401(k) Plan are made upon termination of employment,  retirement, disability and
death.  In addition,  participants  may make  withdrawals in the event of severe
hardship or after the participant attains age fifty-nine and one-half.

     The 401(k) Plan is intended to qualify  under  Section 401 of the Code,  so
that   contributions   made  under  the  401(k)  Plan,   and  income  earned  on
contributions,  are not taxable to participants until withdrawal from the 401(k)
Plan.

     The Company's  contributions to the 401(k) Plan for the account of Mr. Haas
was $0 in 1997, and $2,339 in 1996, respectively. The Company's contributions to
the 401(k) Plan on behalf of all employees in the years ended  December 31, 1997
and 1996 was  $11,490  and $36,306  respectively.  Dr.  Wood is not  eligible to
participate in the Company's 401(k) Plan.

                                       14
<PAGE>
Policy with Respect to $1 Million Deduction Limit

     It is the Company's policy, where practical,  to avail itself of all proper
deductions  under the Code.  Amendments  to the Code in 1993  limit,  in certain
circumstances, the deductibility of compensation in excess of $1 million paid to
each of the five highest paid executives in one year. The total  compensation of
the executive officers did not exceed this deduction  limitation in Fiscal 1996,
and is unlikely to exceed it in 1997.

                                       15
<PAGE>
<TABLE>
                                          SELECTED HISTORICAL AND PRO FORMA FINANCIAL DATA
                                                   AND COMPARATIVE PER SHARE DATA

                               Following are financial statements and the notes thereto of the Company
                                            for the nine months ended September 30, 1998.

                                                        POSITRON CORPORATION
                                                           BALANCE SHEETS
                                                        --------------------
                                                (In thousands, except per share data)
                                                                                                   September 30,        December 31,
                                                                                                         1998               1997
                                                                                                       --------            --------
                                                                                                     (Unaudited)            (Note)
<S>                                                                                                    <C>                 <C>     
ASSETS:
Current assets:
  Cash and cash equivalents                                                                            $    145            $    160
  Accounts receivable, net                                                                                  110                 253
  Inventories                                                                                               331                 408
  Prepaid expenses                                                                                           24                 131
                                                                                                       --------            --------
    Total current assets                                                                                    610                 952

  Plant and equipment, net                                                                                  464                 715
                                                                                                       --------            --------
    Total assets                                                                                       $  1,074            $  1,667
                                                                                                       ========            ========
LIABILITIES AND STOCKHOLDERS' DEFICIT
Current liabilities:
  Accounts payable, trade                                                                              $  1,327            $  1,573
  Accrued liabilities                                                                                     3,281               3,205
  Note payable to an affiliate                                                                              767                 767
  Other note payable                                                                                      1,136                 930
  Unearned revenue                                                                                           60                  60
                                                                                                       --------            --------
    Total current liabilities                                                                             6,571               6,535
                                                                                                       --------            --------

Other liabilities                                                                                           600                 245
                                                                                                       --------            --------
Commitments and contingencies

Stockholders' deficit:
  Series A Preferred Stock: $1.00 par value, 8% cumulative, convertible
    redeemable; $1.00 par value; 5,450,000 shares authorized; 1,564,403
    and 1,594,999 shares issued and outstanding at September 30, 1998 and
    December 31, 1997, respectively                                                                       1,564               1,595
  Series B Preferred Stock: $1.00 par value, cumulative, convertible
    redeemable; 25,000 shares authorized, issued and outstanding at
    June 30, 1998 and December 31, 1997                                                                      25                  25
  Common Stock: $0.01 par value; 15,000,000 shares authorized, 5,159,592
    and 5,128,990 shares issued and outstanding at September 30, 1998 and
    December 31, 1997, respectively                                                                          52                  51
  Additional paid-in capital                                                                             42,221              42,191
  Accumulated deficit                                                                                   (49,944)            (48,960)
  Treasury Stock: 60,156 shares at cost                                                                     (15)                (15)
                                                                                                       --------            --------
    Total stockholders' deficit                                                                          (6,097)             (5,113)
                                                                                                       --------            --------

    Total liabilities and stockholders' deficit                                                        $  1,074            $  1,667
                                                                                                       ========            ========
<FN>
Note:  The balance  sheet at December  31, 1997 has been  derived from the audited  financial  statements  at that date but does not
include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.
See accompanying notes.
</FN>
                                                                 16
</TABLE>
<PAGE>
<TABLE>
                                                        POSITRON CORPORATION
                                                      STATEMENTS OF OPERATIONS
                                                      ------------------------
                                                  (In thousands, except share data)
                                                             (Unaudited)
<CAPTION>
                                                                      Three Months Ended                    Nine Months Ended
                                                              September 30,      September 30,      September 30,      September 30,
                                                                   1998               1997               1998               1997
<S>                                                            <C>                <C>                <C>                <C>        
Revenues:
        Fee per scan                                           $       147        $       229        $       454        $       437
        Service and component                                          153                431                933              1,321
                                                               -----------        -----------        -----------        -----------
             Total revenues                                            300                660              1,387              1,758
                                                               -----------        -----------        -----------        -----------

Costs of sales and services:
        Fee per scan                                                    29                 39                 89                117
        Service, warranty and component                                108                221                286                500
                                                               -----------        -----------        -----------        -----------
             Total costs of sales and services                         137                260                375                617
                                                               -----------        -----------        -----------        -----------
             Gross profit                                              163                400              1,012              1,141
                                                               -----------        -----------        -----------        -----------

Operating expenses:
        Research and development                                      --                  421                 18              1,037
        Selling and marketing                                         --                  230                 16                572
        General and administrative                                     840                673              1,734              1,921
                                                               -----------        -----------        -----------        -----------
             Total operating expenses                                  840              1,324              1,768              3,530
                                                               -----------        -----------        -----------        -----------

             Loss from operations                                     (677)              (924)              (756)            (2,389)
                                                               -----------        -----------        -----------        -----------

Other income (expenses):
        Other expense                                                 --                    8               --                  (93)
        Interest expense                                               (67)               (53)              (228)              (243)
                                                               -----------        -----------        -----------        -----------
             Total other expense                                       (67)               (45)              (228)              (336)
                                                               -----------        -----------        -----------        -----------

Net loss                                                       $      (744)       $      (969)       $      (984)       $    (2,725)
                                                               ===========        ===========        ===========        ===========

Basic and dilutive net loss per common share                   $     (0.14)       $     (0.19)       $     (0.19)       $     (0.57)
                                                               ===========        ===========        ===========        ===========

Weighted average common shares outstanding                       5,144,291          5,111,292          5,139,191          4,794,107
                                                               ===========        ===========        ===========        ===========
<FN>
Note:  The Company's financial statements include no additional elements of comprehensive income.  Accordingly,
comprehensive income and net income are identical.

                                                  See accompanying notes.
</FN>
                                                                 17
</TABLE>
<PAGE>
<TABLE>
                                                        POSITRON CORPORATION
                                                 CONDENSED STATEMENTS OF CASH FLOWS
                                                 ----------------------------------
                                                           (In thousands)
                                                             (Unaudited)
<CAPTION>
                                                                                                               Nine Months Ended
                                                                                                        September 30,  September 30,
                                                                                                             1998            1997
                                                                                                            -------         -------
<S>                                                                                                         <C>             <C>     
Cash flows from operating activities:
        Net loss                                                                                            $  (984)        $(2,725)
        Adjustment to reconcile net loss to net cash used in operating activities                              (763)          2,340
                                                                                                            -------         -------
             Net cash used in operating activities                                                             (221)           (385)
                                                                                                            -------         -------

Cash flows from investing activities:
        Capital expenditures, net                                                                              --                 3
                                                                                                            -------         -------
             Net cash used in investing activities                                                             --                 3
                                                                                                            -------         -------

Cash flows from financing activities:
        Proceeds from other notes payable                                                                       568            --
        Repayment of other notes payable                                                                       (362)           --
        Proceeds from conversion of warrants to common stock                                                   --                 3
                                                                                                            -------         -------
             Net cash provided by (used in) financing activities                                                206               3
                                                                                                            -------         -------

Net decrease  in cash and cash equivalents                                                                      (15)           (379)

Cash and cash equivalents, beginning of year                                                                    160             382
                                                                                                            -------         -------

Cash and cash equivalents, end of year                                                                      $   145         $     3
                                                                                                            =======         =======


<FN>
                                                  See accompanying notes.
</FN>
                                                                 18
</TABLE>
<PAGE>
                              POSITRON CORPORATION
                     SELECTED NOTES TO FINANCIAL STATEMENTS
                     --------------------------------------
1.   Basis of Presentation

     The accompanying  unaudited interim financial statements have been prepared
     in accordance with generally accepted  accounting  principles and the rules
     of the U.S.  Securities  and  Exchange  Commission,  and  should be read in
     conjunction  with  the  audited  financial  statements  and  notes  thereto
     contained in the Company's  Annual Report of Form 10-KSB for the year ended
     December  31,  1997.  In  the  opinion  of  management,   all  adjustments,
     consisting  of  normal   recurring   adjustments,   necessary  for  a  fair
     presentation  of financial  position and the results of operations  for the
     interim  periods  presented  have been  reflected  herein.  The  results of
     operations  for  interim  periods  are not  necessarily  indicative  of the
     results to be expected for the full year. Notes to the financial statements
     which would substantially duplicate the disclosure contained in the audited
     financial  statements  for the most recent  fiscal year ended  December 31,
     1997, as reported in the Form 10-KSB, have been omitted.

2.   Company Operations

     Since its  inception  the Company  has been unable to sell its  POSICAM(TM)
     systems  in  sufficient  quantities  to be  profitable.  Consequently,  the
     Company has  sustained  substantial  losses.  Net losses for the year ended
     December  31,  1997 and the nine  months  ended  September  30,  1998  were
     $4,455,000  and  $984,000,  respectively.  The Company  has an  accumulated
     deficit of $49,944,000  at September 30, 1998.  Due to the sizable  selling
     prices of the Company's  systems and the limited  number of systems sold or
     placed in  service  each  year,  the  Company's  revenues  have  fluctuated
     significantly year to year.

     At September  30, 1998,  the Company had cash and cash  equivalents  in the
     amount of $145,000  compared to $160,000 at December 31, 1997.  During 1997
     and the first nine months of 1998,  the Company was unable to meet  certain
     obligations  as they  came  due.  As a result  of the  Company's  liquidity
     problem,  1997  salary  payments  to  certain  management  level  employees
     totaling approximately $600,000 were unpaid at September 30, 1998.

     Additionally,  the  Company  currently  has no shares of its  Common  Stock
     available  for  issuance and all other  authorized  shares have either been
     issued or  reserved  for  issuance  in respect of  outstanding  options and
     warrants  or  convertible  securities.  The lack of such  available  shares
     significantly  restricts the Company's ability to raise capital through the
     issuance of additional equity  securities.  While the Company believes that
     its  shareholders  will  approve an  increase  in the number of  authorized
     shares of Common Stock at its Annual Meeting of Shareholders,  no assurance
     can be given that such  increase in  authorized  shares will be approved by
     the Company's shareholders.

3.   Net Loss Per Share

     Net loss per common share for the three and nine months ended September 30,
     1998 and 1997 have  been  computed  by  dividing  net loss by the  weighted
     average number of shares of Common Stock outstanding during these periods.

4.   Estimates

     The  preparation  of financial  statements  in  conformity  with  generally
     accepted  accounting  principles  requires management to make estimates and
     assumptions  that affect the reported amounts of assets and liabilities and
     disclosures  of  contingent  assets  or  liabilities  at  the  date  of the
     financial  statements  and the  reported  amounts of revenues  and expenses
     during  the  reporting  period.  Actual  results  could  differ  from those
     estimates.

5.   Income Tax

     The  difference  between  the  Federal  statutory  income  tax rate and the
     Company's effective income tax rate is primarily  attributable to increases
     in valuation  allowances for deferred tax assets  relating to net operating
     losses.

6.   Imatron Transaction

     In  May  1998,  the  Company   entered  into  an  agreement  (the  "Imatron
     Transaction") with Imatron, Inc. ("Imatron"),  whereby Imatron will acquire

                                       19
<PAGE>
     a majority  ownership of the Company.  In conjunction with the execution of
     definitive  agreements,  Imatron  began  making  working  capital  advances
     available  to the  Company  up to  $500,000  (subsequently  revised by oral
     agreement  to  $750,000)  in order to enable  it to meet a  portion  of its
     current  obligations.  As of September  30, 1998,  the Company had borrowed
     $568,000. The loan bears interest at 1/2% over the prime rate, is due March
     1, 2000 (with interest being payable monthly), and is secured by all of the
     Company's assets.

     Under the terms of the agreement, Imatron will acquire a majority ownership
     of the outstanding Common Stock of the Company on a fully-diluted and as-if
     converted basis, which assumes that all outstanding  warrants,  options and
     other  derivatives  have been  exercised or converted into shares of Common
     Stock other than out-of-the-money  warrants and options,  determined at the
     time of  issuance  of shares to  Imatron.  If such  shares  were  issued to
     Imatron on  September  30, 1998 the Company  would have been  obligated  to
     issue 9,000,000  shares of Common Stock. The Company will receive a nominal
     cash payment of $100 from Imatron in payment for the shares.

     In addition to providing  limited  working capital  financing,  Imatron has
     agreed to support the Company's marketing program, particularly with regard
     to Imatron's affiliate,  Imatron Japan, Inc. by agreeing to make, after the
     share issuance closing date, all reasonable  efforts to cause the placement
     of 10 POSICAM(TM)  systems over the next three years.  The Company recently
     shipped a POSICAM(TM) system to Imatron Japan as the first delivery under a
     three-year  distribution agreement entered into last year. Imatron Japan is
     a major  distributor  for  Imatron's  Ultrafast CT and for the equipment of
     certain  other  high  technology  companies.  Imatron  has a  24%  minority
     interest in Imatron Japan.

     Imatron  has also agreed to help  facilitate  the  recapitalization  of the
     Company to support its re-entry  into the medical  imaging  market by using
     its best  efforts  after the share  issuance  closing  date to arrange  for
     additional   third-party   equity   financing   for  the  Company  over  an
     eighteen-month  period in an aggregate  amount of not less than $8,000,000.
     There can be no assurances,  however,  that any such sales will actually be
     consummated or that Imatron will be able to successfully assist the Company
     in raising additional capital.

     Consummation  of the  issuance  of shares to Imatron is  conditioned  upon,
     among other things (a) the resignation of each officer of the Company,  (b)
     the  resignation  of at least three of the four  current  directors  of the
     Company and the  appointment of Imatron's  nominees to fill such vacancies,
     and (c) shareholder  approval of an amendment to the Company's  Articles of
     Incorporation  to  increase  its  authorized   Common  Stock  to  at  least
     100,000,000  shares.  The Company  anticipates  that the share  issuance to
     Imatron  will close  immediately  after the Annual  Meeting if the required
     shareholder approval is obtained.

     In connection  with the above  transactions,  the Company,  Imatron and two
     current lenders,  Uro-Tech, Ltd. ("Uro-Tech") and ProFutures Bridge Capital
     Fund,  L.P.  ("ProFutures"),  entered into certain  agreements  whereby (a)
     ProFutures  waived all past  defaults and extended the maturity of its loan
     (with a current balance of approximately  $570,000) to December 5, 1998, in
     return  for a  $50,000  payment,  the  issuance  of  warrants  to  purchase
     1,150,000  shares of Common  Stock at $0.25 per share (in  addition  to the
     issuance of  previously  bargained  for warrants to purchase an  additional
     100,000  shares  of Common  Stock at $0.25 per  share),  and  minimum  loan
     repayments  of $50,000 for each of the months of April,  May, June and July
     1998,  $100,000  for the month of August  1998 and  $50,000 for each of the
     months of  September,  October  and  November  1998 (b)  Imatron  agreed to
     subordinate   its  loan  to  ProFuture's   loan,  (c)  Uro-Tech  agreed  to
     subordinate its loan (with a current balance of approximately $767,000 plus
     accrued interest payable of approximately  $286,000) to Imatron's loan, and
     (d)  ProFutures  and  Imatron  agreed  that all  amounts  above  the  first
     $1,000,000 of any third party equity financing obtained by Imatron would be
     applied  equally  to  reduce  the  Company's  debt to both  ProFutures  and
     Imatron.  Consistent with the oral amendment to the Imatron Agreement,  the
     Company and  ProFutures  have amended their  agreements to provide  further
     waivers of any past defaults and have further  extended the maturity of the
     ProFutures  Loan to December 5, 1998 and minimum loan repayments of $50,000
     for each of the months of September,  October and November 1998,  leaving a
     balance at December 5, 1998 of  approximately  $400,000.  Imatron agreed to
     continue to  subordinate  its loan to the  ProFutures  Loan,  and  Uro-Tech
     agreed to subordinate its loan to Imatron's loan. Except as modified by the
     amendments, the remaining agreements remain the same.

                                       20
<PAGE>
     The Company is in negotiations to sell one of its POSICAM(TM)  systems to a
     third party that currently  leases the system.  It is anticipated  that, if
     the Company is  successful in  consummating  such sale, it will receive net
     proceeds of approximately  $360,000.  It is the Company's  intention to use
     such  proceeds,  plus  proceeds  from a service  contract  currently  being
     negotiated  with the  third  party,  to retire  the  remaining  balance  of
     approximately  $400,000 on the ProFutures Loan. There can be no assurances,
     however,  that the Company  will be  successful  in  reaching an  agreement
     concerning the proposed system sale or that, if agreement is reached,  such
     sale will be  consummated,  or that the Company  otherwise  will be able to
     obtain  additional  debt  or  equity  financing   necessary  to  repay  the
     ProFutures Loan by such maturity date. Absent obtaining a further extension
     of the December 5, 1998 maturity date of the ProFutures  Loan,  closing the
     proposed sale of the POSICAM(TM)  system,  or obtaining  additional debt or
     equity  financing  necessary to repay the  ProFutures  Loan by the maturity
     date,  the  Company  may be forced  to seek  protection  under the  Federal
     Bankruptcy laws.

     If the proposal to amend the  Company's  Articles of  Incorporation  is not
     approved by the Company's shareholders, or if such proposal is approved but
     the Imatron  Transaction  does not  subsequently  close, the Company may be
     forced  to seek  protection  under the  Federal  Bankruptcy  laws.  Even if
     Proposal Two to amend the Company's  Articles of  Incorporation is approved
     and the Imatron  Transaction  closes,  there can be no assurances  that the
     Company will thereafter be able to raise sufficient capital for the Company
     to continue as a going concern or even if such additional capital is raised
     that the  Company  will ever  achieve  the level of  revenues  needed to be
     profitable in the future, or, if profitability is achieved, that it will be
     sustained.

7.   Contingencies

     The City of Houston has filed suit, and judgment has been entered,  against
     the Company for delinquent taxes in the amount of  approximately  $240,000.
     The balance is fully accrued at September 30, 1998.

     The Company is obligated to pay  royalties of 3% of the gross  revenue from
     sales, uses, leases,  licensing or rentals of POSICAM systems, 1% each to a
     director of the Company and two other unrelated entities.  During the years
     ended December 31, 1997 and 1996 the Company incurred royalties of $134,000
     and  $42,000,  respectively,  based upon system  sales and  adjustments  to
     royalties.

     The  Company's   royalties   were  reduced  to  the  3%  level  based  upon
     consideration,  provided to two of the payees, under consulting  agreements
     and promissory notes.  However,  the consulting  agreements provide that if
     the Company defaults in its payment obligations thereunder, then the payees
     would be entitled to receive  regrant of the royalties that they previously
     released.  In April 1998, the Company  received a demand letter from one of
     the payees  alleging  default  under his  consulting  agreement in 1997 and
     demanding  regrant of an  additional  1%  royalty  interest.  Although  the
     Company  has not  received a demand  from the  second  payee,  the  Company
     believes  that a payment  default may have  occurred  under his  consulting
     agreement and that as a result  thereof,  he may be entitled to the regrant
     of an additional 0.5% royalty interest.  The Company anticipates initiating
     settlement  discussions  with both payees  concerning  the alleged  payment
     defaults.  The Company is unable to predict the outcome of such discussions
     at this time; however,  the Company recorded an adjustment of approximately
     $100,000 during 1997 in recognition of the additional royalties it may owe.
     If the parties  fail to reach a  settlement,  one payee will be entitled to
     receive an  aggregate  2% royalty and the second  payee will be entitled to
     receive  an  aggregate  1.5%  royalty,  resulting  in an  increase  of  the
     Company's  royalty  obligations  from 3% to 4.5%.  Such increase in royalty
     obligations  could have a material  adverse effect on the Company's  future
     financial performance.

     Arbitration  procedures  have been  initiated  against the Company in China
     involving a dispute with respect to a POSICAMTM system. The Company entered
     into a contract  with a Chinese  company in  September  1996 to provide the
     company with a POSICAMTM  system.  The Chinese company provided the Company
     with a down  payment of  approximately  $300,000  and agreed to provide the
     company with a letter of credit for the  remaining  purchase  price,  which
     letter of credit would be fundable upon  shipment of the POSICAMTM  system.
     The Company  utilized the down payment to purchase the beginning  inventory
     for the system and began  construction of the system.  The Chinese company,
     however,  failed to provide the  Company  with the letter of credit and the
     Company,  because  of its  severe  financial  difficulties,  was  unable to
     complete and deliver the system without such additional  funds. The Chinese

                                       21
<PAGE>
     company has demanded the return of its deposit and, on September 8, 1998, a
     notice of arbitration  concerning the sales contract  dispute was issued to
     the  Company  by the China  International  Economic  and Trade  Arbitration
     Commission,  Shanghai  Commission.  The  Company  believes  that the claims
     raised by the Chinese  company are without  merit and intends to vigorously
     defend  its  interests.  It is not  possible  at this time to  predict  the
     outcome of this  proceeding,  although a ruling  unfavorable to the Company
     could  have a  material  adverse  effect  on  the  Company's  business  and
     financial performance.

8.   Comprehensive Income

     Effective  January 1, 1998,  the Company  adopted  Statement  of  Financial
     Accounting  Standards  ("SFAS") No. 130,  Reporting  Comprehensive  Income,
     which  requires a company to display an amount  representing  comprehensive
     income as part of the company's basic financial  statements.  Comprehensive
     income  includes  such  items as  unrealized  gains or  losses  on  certain
     investment securities and certain foreign currency translation adjustments.
     The Company's financial  statements include none of the additional elements
     that affect comprehensive income. Accordingly, comprehensive income and net
     income are identical.

                                       22
<PAGE>

     Following are the reports of independent accountants,  financial statements
and the notes  thereto of the Company for the years ended  December 31, 1997 and
1996.

                        Report of Independent Accountants

Board of Directors and Stockholders
Positron Corporation

We have audited the  accompanying  balance sheet of Positron  Corporation  as of
December  31,  1997 and the  related  statements  of  operations,  stockholders'
deficit and cash flows for the year then ended.  These financial  statements are
the responsibility of the Company's management. Our responsibility is to express
an opinion on these financial statements based on our audit.

We conducted our audit in accordance with generally accepted auditing standards.
Those standards  require that we plan and perform the audit to obtain reasonable
assurance   about  whether  the  financial   statements  are  free  of  material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for our opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all material  respects,  the financial  position of Positron  Corporation  as of
December 31, 1997,  and the results of its operations and its cash flows for the
year then ended in conformity with generally accepted accounting principles.

The  accompanying  financial  statements  have been  prepared  assuming that the
Company  will  continue  as a  going  concern.  As  discussed  in  Note 1 to the
financial statements,  the Company has suffered recurring losses from operations
and has a net capital deficiency that raises substantial doubt about its ability
to continue as a going concern.  Management's plan with regard to this matter is
also  described  in  Note  1.  The  financial  statements  do  not  include  any
adjustments that might result from the outcome of this uncertainty.


                                            /s/  Ham, Langston & Brezina, L.L.P.

Houston,  Texas July 25, 1998,  except for Notes 15 and 16, as to which the date
is October 27, 1998


                                       23
<PAGE>
                        Report of Independent Accountants

Board of Directors and Stockholders
Positron Corporation

We have audited the  accompanying  balance sheet of Positron  Corporation  as of
December  31,  1996 and the  related  statements  of  operations,  stockholders'
deficit and cash flows for the year then ended.  These financial  statements are
the responsibility of the Company's management. Our responsibility is to express
an opinion on these financial statements based on our audit.

We conducted our audit in accordance with generally accepted auditing standards.
Those standards  require that we plan and perform the audit to obtain reasonable
assurance   about  whether  the  financial   statements  are  free  of  material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for our opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all material  respects,  the financial  position of Positron  Corporation  as of
December 31, 1996,  and the results of its operations and its cash flows for the
year then ended in conformity with generally accepted accounting principles.

The  accompanying  financial  statements  have been  prepared  assuming that the
Company  will  continue  as a  going  concern.  As  discussed  in  Note 1 to the
financial statements,  the Company has suffered recurring losses from operations
and has a net capital deficiency that raises substantial doubt about its ability
to continue as a going concern.  Management's plan with regard to this matter is
also  described  in  Note  1.  The  financial  statements  do  not  include  any
adjustments that might result from the outcome of this uncertainty.

                                                   /s/  Coopers & Lybrand L.L.P.


Houston, Texas
April 9, 1997



                                       24
<PAGE>
<TABLE>
                                                        POSITRON CORPORATION
                                                           BALANCE SHEETS
                                                        --------------------
                                                  (In thousands, except share data)
<CAPTION>
                                                                                                                   December 31,
                                   ASSETS                                                                    1997            1996
                                                                                                           --------        --------
<S>                                                                                                        <C>             <C>     
Current assets:
         Cash and cash equivalents                                                                         $    160        $    382
         Accounts receivable, net                                                                               253             520
         Notes receivable                                                                                      --               324
         Inventories                                                                                            408           2,633
         Prepaid expenses                                                                                       131             159
         Other current assets                                                                                  --               426
                                                                                                           --------        --------
           Total current assets                                                                                 952           4,444
         Plant and equipment, net                                                                               715             967
         Intangible assets, net                                                                                --               106
                                                                                                           --------        --------
           Total asset                                                                                     $  1,667        $  5,517
                                                                                                           ========        ========

                    LIABILITIES AND STOCKHOLDERS' DEFICIT
Current liabilities:
         Accounts payable, trade                                                                           $  1,573        $  1,113
         Accrued liabilities                                                                                  3,205           2,654
         Revolving line of credit                                                                              --                75
         Note payable to an affiliate                                                                           767             663
         Other note payable                                                                                     930           1,335
         Unearned revenue                                                                                        60             267
                                                                                                           --------        --------
           Total current liabilities                                                                          6,535           6,107
                                                                                                           --------        --------
Other liabilities                                                                                               245              68
                                                                                                           --------        --------
Commitments and contingencies
Stockholders' deficit:
         Series A Preferred Stock: $1.00 par value; 8% cumulative, convertible,
           redeemable; 5,450,000 shares authorized; 1,594,999 and 2,404,624
           shares  issued  and  outstanding at December 31, 1997 and 1996,
           respectively
                                                                                                              1,595           2,405
         Series B Preferred Stock: $1.00 par value, 8% cumulative, convertible,
           redeemable; 25,000 shares authorized, issued and outstanding at December 31,
           1997 and 1996                                                                                         25              25
         Common stock: $0.01 par value; 15,000,000 shares authorized,
           5,128,990 and 4,312,182 shares issued and outstanding at December 31, 1997
           and 1996                                                                                              51              43
         Additional paid-in capital                                                                          42,191          41,374
         Accumulated deficit                                                                                (48,960)        (44,505)
         Treasury stock: 60,156 shares at cost                                                                  (15)           --
                                                                                                           --------        --------
           Total stockholders' deficit                                                                       (5,113)           (658)
                                                                                                           --------        --------
              Total liabilities and stockholders' deficit                                                  $  1,667        $  5,517
                                                                                                           ========        ========
<FN>
                                            See notes to financial statements.
</FN>
                                                                 25
</TABLE>
<PAGE>
<TABLE>
                                                        POSITRON CORPORATION
                                                      STATEMENTS OF OPERATIONS
                                                      ------------------------
                                                  (In thousands, except share data)
<CAPTION>
                                                                                                     Year Ended December 31,
                                                                                                 1997                       1996
                                                                                             -----------                -----------
<S>                                                                                          <C>                        <C>        
Revenues:
         System sales                                                                        $     1,129                $       650
         Fee per scan                                                                                602                        415
         Service and component                                                                     1,795                      2,510
                                                                                             -----------                -----------
           Total revenues                                                                          3,526                      3,575
                                                                                             -----------                -----------
Costs of sales and services:
         System sales                                                                                698                        316
         Fee per scan                                                                                156                        172
         Service, warranty and component                                                             465                        610
         Provision for loss on system exchange                                                      --                        1,000
         Provision for inventory obsolescence                                                      1,224                       --
                                                                                             -----------                -----------
           Total costs of sales and services                                                       2,543                      2,098
                                                                                             -----------                -----------
              Gross profit                                                                           983                      1,477
                                                                                             -----------                -----------
Operating expenses:
         Research and development                                                                  1,305                      2,227
         Selling, general and administrative                                                       3,609                      5,263

           Total operating costs                                                                   4,914                      7,490
                                                                                             -----------                -----------

Loss from operations                                                                              (3,931)                    (6,013)
                                                                                             -----------                -----------

Other expenses:
         Interest expenses                                                                          (334)                      (197)
         Other expense                                                                              (190)                      (165)
                                                                                             -----------                -----------

           Total other expense                                                                      (524)                      (362)
                                                                                             -----------                -----------

Net loss                                                                                     $    (4,455)               $    (6,375)
                                                                                             ===========                ===========

Basic and dilutive net loss per common share                                                 $     (0.91)               $     (1.67)
                                                                                             ===========                ===========

Weighted average common shares outstanding                                                     4,884,870                  3,811,026
                                                                                             ===========                ===========
<FN>
                                            See notes to financial statements.
</FN>
                                                                 26
</TABLE>
<PAGE>
<TABLE>
                                                        POSITRON CORPORATION
                                                 STATEMENTS OF STOCKHOLDERS' DEFICIT
                                           For the Years Ended December 31, 1997 and 1996

                                                  (In thousands, except share data)
<CAPTION>

                                                      Series A                  Series B
                                                   Preferred Stock           Preferred Stock                Common Stock
                                                  Shares      Amount        Shares     Amount           Shares       Amount
<S>                                             <C>          <C>            <C>         <C>           <C>              <C>
Balance at January 1, 1996                            --     $   --            --        --           3,637,320        $ 36
Net loss                                              --         --            --        --                 --          --
Issuance of Series A Preferred Stock            2,641,989      2,642           --        --                 --          --
Issuance of Series B Preferred Stock                  --         --         25,000        25                --          --
Conversion of  Series A Preferred Stock to
    Common Stock                                 (670,694)      (670)          --        --             670,694           7
Conversion of Warrants to Common Stock                --         --            --        --               4,168         --
Conversion of note payable to an affiliate
    to Series A Preferred Stock                   433,329        433           --        --                 --          --

Balance at December 31, 1996                    2,404,624      2,405        25,000        25          4,312,182          43
Net loss                                              --         --            --        --                 --          --
Conversion of Series A Preferred Stock to 
    Common Stock                                 (809,625)      (810)          --        --             809,625           8
Conversion of Warrants to Common Stock                --         --            --        --               7,183         --
Treasury stock received upon settlement of
    note receivable                                   --         --            --        --                 --          --

Balance at December 31, 1997                    1,594,999    $ 1,595        25,000      $ 25          5,128,990        $ 51
                                                =========    =======        ======      ====          =========        ====
</TABLE>
<TABLE>
<CAPTION>
                                                     Additional
                                                       Paid-In     Accumulated   Treasury
                                                       Capital       Deficit       Stock         Total

<S>                                                    <C>          <C>           <C>            <C>    
Balance at January 1, 1996                             $ 39,309     $ (38,130)    $ --           $ 1,215
Net loss                                                    --         (6,375)      --            (6,375)
Issuance of Series A Preferred Stock                         52           --        --             2,694
Issuance of Series B Preferred Stock                      1,125           --        --             1,150
Conversion of  Series A Preferred Stock to
    Common Stock                                            663           --        --               --
Conversion of Warrants to Common Stock                        8           --        --                 8
Conversion of note payable to an affiliate to
    Series A Preferred Stock                                217           --        --               650

Balance at December 31, 1996                             41,374       (44,505)      --              (658)
Net loss                                                    --         (4,455)      --            (4,455)
Conversion of Series A Preferred Stock to 
    Common Stock                                            802           --        --               --
Conversion of Warrants to Common Stock                       15           --        --                15
Treasury stock received upon settlement of note
    receivable                                              --            --        (15)             (15)

Balance at December 31, 1997                           $ 42,191     $ (48,960)    $ (15)        $ (5,113)
                                                       ========     =========     =====         ========
<FN>
                                                 See notes to financial statements.
</FN>
                                                                 27
</TABLE>
<PAGE>         
<TABLE>
                                                        POSITRON CORPORATION
                                                      STATEMENTS OF CASH FLOWS
                                                      ------------------------
                                                           (In thousands)
<CAPTION>
                                                                                                           Year Ended December 31,
                                                                                                           1997               1996
                                                                                                         -------            -------
<S>                                                                                                      <C>                <C>     
Cash flows from operating activities:
    Net loss                                                                                             $(4,455)           $(6,375)
    Adjustment to reconcile net loss to net cash provided by (used in)
operating activities:
      Depreciation                                                                                           255                112
      Provision for doubtful accounts and notes receivable                                                   456                760
      Provision for obsolescence of inventory                                                              1,224               --
      Provision to reduce intangible assets to net realizable value                                           81               --
      Amortization of intangible assets                                                                       25                 25
      Provision for loss on exchange of system                                                              --                1,000
      Change in assets and liabilities, operating:
        Decrease (increase) in accounts receivable                                                           (87)               404
        Decrease in inventories                                                                            1,001                 33
        Decrease in prepaid expenses                                                                          26                124
        Decrease (increase) in other current assets                                                          426               (368)
        Increase (decrease) in accounts payable, trade                                                       460               (642)
        Increase (decrease) in accrued liabilities                                                           553               (233)
        Increase (decrease) in revolving line of credit                                                      (75)                75
        Increase (decrease) in other liabilities                                                             177                (11)
                                                                                                         -------            -------

          Net cash provided by (used in) operating activities                                                 67             (5,096)
                                                                                                         -------            -------

Cash flows from investing activities:
    Capital expenditures                                                                                      (3)               (51)
                                                                                                         -------            -------

      Net cash used in investing activities                                                                   (3)               (51)
                                                                                                         -------            -------

Cash flows from financing activities:
    Proceeds from note payable to an affiliate                                                               104                240
    Proceeds from other notes payable                                                                       --                1,400
    Repayment of other notes payable                                                                        (405)               (65)
    Proceeds from issuance of Series A preferred stock                                                      --                3,375
    Series A preferred stock issuance costs                                                                 --                 (681)
    Proceeds from issuance of Series B preferred stock                                                      --                1,250
    Series B preferred stock issuance costs                                                                 --                 (100)
    Proceeds from conversion of warrants to common stock                                                      15                  8
                                                                                                         -------            -------

      Net cash provided by (used in) financing activities                                                   (286)             5,427
                                                                                                         -------            -------

Net increase (decrease) in cash and cash equivalents                                                        (222)               280
Cash and cash equivalents, beginning of year                                                                 382                102
                                                                                                         -------            -------
Cash and cash equivalents, end of year                                                                   $   160            $   382
                                                                                                         =======            =======
<FN>
                                                 See notes to financial statements.
</FN>
                                                                 28
</TABLE>
<PAGE>
                              POSITRON CORPORATION
                          NOTES TO FINANCIAL STATEMENTS
                          -----------------------------

1.       Description of Business

         The Company was incorporated on December 20, 1983 in the state of Texas
         and commenced  commercial  operations during 1986. The Company designs,
         manufactures,  markets and  services  its  POSICAMTM  system,  advanced
         medical imaging devices, utilizing positron emission tomography ("PET")
         technology.   These  systems   utilize  the   Company's   patented  and
         proprietary  technology,   an  imaging  technique  which  assesses  the
         biochemistry, cellular metabolism and physiology of organs and tissues,
         as well as producing anatomical and structural images. Targeted markets
         include medical  facilities and diagnostic  centers located  throughout
         the world.  POSICAMTM  systems are used by physicians as diagnostic and
         treatment  evaluation  tools in the areas of cardiology,  neurology and
         oncology.  The Company  faces  competition  principally  from two other
         companies which specialize in advanced medical imaging equipment.

         Since its  inception  the Company has been unable to sell its POSICAMTM
         systems in sufficient  quantities to be profitable.  Consequently,  the
         Company  has  sustained  substantial  losses.  Net losses for the years
         ended  December  31,  1997 and 1996  were  $4,455,000  and  $6,375,000,
         respectively,  and at December 31, 1997 the Company has an  accumulated
         deficit of  $48,960,000.  The  magnitude  of the selling  prices of the
         Company's  systems and the limited  number of systems sold or placed in
         service  each year has  caused  the  Company's  revenues  to  fluctuate
         significantly year to year.

         At December 31, 1997, the Company had cash and cash  equivalents in the
         amount of $160,000  compared to $382,000 at December 31,  1996.  During
         both 1996 and 1997, the Company was unable to meet certain  obligations
         as they  came due and the  Company's  liquidity  problems  have  become
         critical. As a result of the Company's severe liquidity problem, salary
         payments  owed  to  certain   management   level   employees   totaling
         approximately $700,000 were unpaid at December 31, 1997.

         To deal with its critical liquidity  problem,  in June 1998 the Company
         entered into a preliminary  agreement (the "Imatron  Transaction") with
         Imatron, Inc. ("Imatron"),  whereby Imatron plans to acquire a majority
         ownership in the Company (See Note 16). If the Imatron  Transaction  is
         not completed or if the Imatron Transaction is completed and Imatron is
         unsuccessful   in  its  efforts  to  raise  capital  for  the  Company,
         management  believes  that the Company  will be unable to continue as a
         going  concern  and that the  Company's  assets  will be  seized by its
         secured creditors.

         The Company  currently has no shares of its Common Stock  available for
         issuance and all authorized  shares have either been issued or reserved
         for  issuance  in  respect  of  outstanding  options  and  warrants  or
         convertible securities. The lack of such available shares significantly
         restricts the Company's  ability to raise capital  through the issuance
         of additional  equity  securities.  While the Company believes that its
         shareholders  will  approve an  increase  in the  number of  authorized
         shares  of Common  Stock at its  Annual  Meeting  of  Shareholders,  no
         assurance can be given that such increase in authorized  shares will be
         approved by the Company's shareholders.

2.       Summary of Significant Accounting Policies

         Cash and Cash Equivalents

         Cash and cash  equivalents  include all cash balances and highly liquid
         investments with an original maturity of three months or less.

         Inventory

         Inventories  are  stated  at the lower of cost or  market  and  include
         material,  labor and overhead.  Cost is determined  using the first-in,
         first-out (FIFO) method of inventory valuation.

                                       29
<PAGE>
         Plant and Equipment

         Plant and equipment are recorded at cost and  depreciated for financial
         statement purposes using the straight-line method over estimated useful
         lives of five to seven  years.  Gains or  losses  on  dispositions  are
         included  in  the  statement  of  operations  in the  period  incurred.
         Maintenance and repair cost are charged to expense as incurred.

         Intangible Assets

         Intangible  assets,   consisting   principally  of  patent  costs,  are
         amortized using the straight-line  method over an estimated useful life
         of 10 years.

         Impairment of Long-Lived Assets

         Periodically, the Company evaluates the carrying value of its plant and
         equipment,  and long-lived  assets,  which  includes  patents and other
         intangible  assets, by comparing the anticipated  future net cash flows
         associated  with those  assets to the  related  net book  value.  If an
         impairment is indicated as a result of such reviews,  the Company would
         remove the  impairment  based on the fair  market  value of the assets,
         using  techniques  such as projected  future  discounted  cash flows or
         third party  valuations.  As of December 31,  1997,  an  adjustment  to
         intangible assets was indicated and recorded.

         Revenue Recognition

         Revenues  from  POSICAMTM  system  contracts  are  recognized  when all
         significant costs have been incurred and the system has been shipped to
         the customer.  Revenues from fee per scan contracts are recognized upon
         performance of patient scans.  Revenues from maintenance  contracts are
         recognized  over  the  term  of  the  contract.  Service  revenues  are
         recognized upon performance of the services.

         Research and Development Expenses

         All costs related to research and development are charged to expense as
         incurred.

         Warranty Costs

         The  Company  accrues  for the cost of product  warranty  on  POSICAMTM
         systems at the time of shipment. Warranty periods generally range up to
         a maximum of one year.  Actual  results  could  differ from the amounts
         estimated.

         Net Loss Per Common Share

         Basic and  dilutive  net loss per  common  share  for the  years  ended
         December  31, 1997 and 1996 have been  computed by dividing net loss by
         the  weighted  average  number of shares  of Common  Stock  outstanding
         during these periods. All Common Stock equivalents were antidilutive.

         Estimates

         The  preparation of financial  statements in conformity  with generally
         accepted  accounting  principles  requires management to make estimates
         and  assumptions  that  affect  the  reported  amounts  of  assets  and
         liabilities and disclosure of contingent  assets and liabilities at the
         date of the financial  statements and the reported  amounts of revenues
         and expenses during the reporting  period.  Actual results could differ
         from those estimates.

                                       30
<PAGE>
         Fair Value of Financial Instruments

         The  Company  includes  fair  value  information  in the  notes  to the
         financial  statements when the fair value of its financial  instruments
         is different from the book value. When the book value approximates fair
         value, no additional disclosure is made.

         Reclassifications

         Certain amounts presented in the Company's  December 31, 1996 financial
         statements  have been  reclassified in order to conform to current year
         presentation.

         New Accounting Pronouncements

         In June 1997, the Financial Accounting Standards Board issued Statement
         of   Financial   Accounting   Standard   (SFAS)  No.  130,   "Reporting
         Comprehensive Income," and SFAS No. 131, "Disclosures about Segments of
         an Enterprise and Related  Information." Both SFAS No. 130 and SFAS No.
         131 are effective for fiscal years  beginning  after December 15, 1997.
         SFAS  130  requires  a  company  to  display  an  amount   representing
         comprehensive  income,  as  defined  by the  statement,  as part of the
         company's basic financial statements. Comprehensive income will include
         items  such  as  unrealized  gains  or  losses  on  certain  investment
         securities and foreign  currency items. The adoption of SFAS 130 should
         not materially affect the Company's financial statements.

         SFAS  131   requires  a  company  to  disclose   financial   and  other
         information,  as defined by the statement, about its business segments,
         their  products  and  services,   geographic  areas,  major  customers,
         revenues,  profits,  assets and other information.  The Company has not
         yet  assessed  the  impact  that  SFAS 131 will  have on its  financial
         statement reporting.

3.       Accounts Receivable

Accounts receivable at December 31, 1997 and 1996 consisted of the following:

                                                      1997                1996
                                                    ------               ------
                                                           (In thousands)
Accounts receivable-- equipment sales               $1,011               $1,011
Accounts receivable-- maintenance                       75                  101
Accounts receivable-- fee per scan                     334                  180
Accounts receivable-- other                             --                   41
                                                    ------               ------
                                                     1,420                1,333
Less allowance for doubtful accounts                (1,227)              (1,080)
                                                    ------               ------
                                                    $  193               $  253

4.       Inventories

Inventories at December 31, 1997 and 1996, consisted of the following:


                                                      1997                1996
                                                    ------               ------
                                                           (In thousands)
Raw materials                                       $1,299               $1,955
Work in process                                        --                    68
Finished goods                                         333                  610
                                                    ------               ------
                                                     1,632                2,633
Less reserve for obsolescence                        1,224                  --
                                                    ------               ------
                                                    $  408               $2,633
                                                    ======               ======


                                       31
<PAGE>
         Due to  improvements  in  technology  that  will slow  movement  of the
         Company's inventory, the Company recorded a reserve for obsolescence of
         $1,224,000  at  December  31,  1997  to  reduce  inventories  to  their
         estimated net realizable value.

5.       Plant and Equipment

         Plant and  equipment  at December  31, 1997 and 1996  consisted  of the
         following:
                                                      1997                1996
                                                    ------               ------
                                                           (In thousands)
Furniture and fixtures                              $  327               $  327
Computers and peripherals                              775                  772
Leasehold improvements                                  17                   17
Leased assets                                          782                  782
Machinery and equipment                                518                  518
                                                    ------               ------
  Total plant and equipment                          2,419                2,416
Less accumulated depreciation                       (1,704)              (1,449)
                                                    ------               ------
                                                    $  715               $  967
                                                    ======               ======

6.       Accrued Liabilities:

         Accrued  liabilities  at December  31, 1997 and 1996  consisted  of the
         following:

                                                      1997                1996
                                                    ------               ------
                                                           (In thousands)
Royalties                                           $  368               $  234
Research grants                                          8                   58
Warranty                                             1,337                1,343
Compensation                                           752                  130
Other                                                  631                  889
                                                    ------               ------
                                                    $3,096               $2,654
                                                    ======               ======

7.       Revolving Line of Credit

         On February 7, 1996, the Company  entered into a lending  facility with
         Boston  Financial & Equity ("BF&E")  Corporation  pursuant to which the
         Company  was allowed to borrow up to 80% of its  outstanding  qualified
         accounts  receivable.  During 1997,  this  revolving line of credit was
         canceled by BF&E and repaid by the Company.

8.       Notes Payable to an Affiliate

         During  1995 and 1996,  in order to fund its  activities,  the  Company
         borrowed a total of  $1,313,000  from Uro- Tech,  Ltd.  (the  "Uro-Tech
         Loan"),  an affiliate of the Company.  The Uro-Tech  Loan,  as amended,
         bears  interest  at 13.8%  per  year and  matured  on April  30,  1997;
         however,  the Company was unable to repay the debt upon  maturity.  The
         Company  obtained  an  effective  extension  of the  Uro-Tech  Loan  in
         connection  with the Imatron  Transaction  (See Note 15).  The Uro-Tech
         Loan is collateralized by liens and security interests encumbering most
         of the Company's assets including the Company's  know-how,  patents and
         proprietary  rights  pertaining to its PET  technology.  As part of the
         private  placement  of  Series  A  Preferred  Stock,  $650,000  of  the
         outstanding  principal  balance of the Uro-Tech Loan was converted into
         Series  A  Preferred   Stock.   As  of  December  31,  1997  and  1996,
         approximately  $767,000 and  $663,000 was payable to Uro-Tech,  Ltd. In
         connection with the loan from Uro-Tech,  the Company  granted  Uro-Tech
         warrants  to purchase  67,500  shares of Common  Stock,  at an exercise
         price of $2.00 per share exercisable through February 7, 2001.

                                       32
<PAGE>
9.       Other Notes Payable

         On November 14, 1996,  in order to fund its continued  activities,  the
         Company obtained a loan facility (the "ProFutures  Loan") of $1,400,000
         from ProFutures  Bridge Capital,  L.P.  ("ProFutures").  The ProFutures
         Loan  originally bore interest at a rate of 12% until April 1, 1997, at
         which date, the rate  increased to 15%. The ProFutures  Loan matured on
         June 30,  1997;  however,  the  Company  was  unable to repay the debt.
         Accordingly,  under  terms  specified  in  the  loan  agreement,  after
         November 30, 1997, the interest rate increased to 18% per annum.  As of
         December  31, 1997 and 1996,  approximately  $930,000  and  $1,335,000,
         respectively,  was outstanding under the ProFutures Loan. Subsequent to
         December 31, 1997, the Company was granted an extension of the maturity
         of  the  ProFutures   Loan  (See  Note  15).  The  ProFutures  Loan  is
         collateralized  by liens and security  interest  encumbering all of the
         assets of the  Company,  including  know-how,  patents and  proprietary
         rights  pertaining  to its PET  technology.  In  addition,  the Company
         granted ProFutures a ten year warrant to purchase 250,000 shares of its
         Common Stock at an exercise price of $2.40 per share.  At April 1, 1997
         the  Company  was  unable  to repay  the  loan to  ProFutures  and,  in
         accordance with the ProFutures Loan,  granted to ProFutures  additional
         warrants  for the  purchase  of 100,000  shares of its Common  Stock at
         $1.84 per share.  Concurrently,  the exercise  price of the  previously
         issued  warrant for 250,000  shares of the  Company's  Common  Stock at
         $2.40 per share was reduced $1.84 per share.

10.      Common Stock - Options and Warrants

         Options

         In 1987, the Company  established a Common Stock option plan (the "1987
         Plan")  covering  directors,  officers  and  other  key  employees.  In
         November 1993, the Company canceled all options  outstanding  under the
         1987  Plan.  In  connection  with  such  cancellations,  the  board  of
         directors  authorized  the  reissuance  of 38,522  options to  purchase
         shares of Common  Stock at 75  percent of the IPO price  following  the
         closing of an initial public  offering.  Such options vested and became
         exercisable  on January 3, 1995.  In addition,  in February  1994,  the
         board of directors  authorized  the issuance of an  additional  150,000
         options at the same exercise price. Options granted under the 1987 Plan
         expired on the earlier of three months after  termination of employment
         or ten years from the grant date.

         Effective June 3, 1994, the  shareholders  of the Company  approved the
         1994 Incentive and Nonstatutory Option Plan (the "1994 Plan"). The 1994
         Plan, as amended,  provides for the issuance of an aggregate of 601,833
         Common  Stock  options  to  key  employees,   directors,   and  certain
         consultants  and advisors of the Company.  The 1994 Plan also  provides
         that the exercise price of Incentive Options shall not be less than the
         fair market value of the shares on the date of the grant.  The exercise
         price per share of Nonstatutory  options shall not be less than the par
         value of the Common Stock or 50% of the fair market value of the Common
         Stock  on the  date of  grant.  The 1994  Plan is  administered  by the
         Compensation Committee of the Board of Directors. The committee has the
         authority to determine the individuals to whom awards will be made, the
         amount of the awards, and all other terms and conditions of the awards.
         As of December  31,  1997,  options to purchase an aggregate of 144,389
         shares of Common  Stock at a range of $2.626 - $4.125  per  share,  had
         been granted to certain key employees.

         The  1994  Plan  also   provides   that  each   non-employee   director
         automatically  receives  options to  purchase  10,500  shares of Common
         Stock at the date such individual becomes a non-employee director. Each
         non-employee  director  who is a  director  on the first  business  day
         following  each Annual  Shareholder  Meeting also receives an option to
         purchase a number of shares of Common  Stock  having a value of $15,000
         as  determined by the fair market value of the Common Stock on the date
         of grant. As of December 31, 1997,  options to purchase an aggregate of
         163,724  shares of Common Stock at a range of  $2.625-$4.125  per share
         had been  granted  to  non-employee  directors.  All 1994 Plan  options
         expire within ten years of the date of the grant.

                                       33
<PAGE>
A summary of stock option activity is as follows:

                                           Shares Issuable
                                          Under Outstanding     Weighted Average
                                               Options           Exercise Price

Balance at January 1, 1996                     584,204               $  2.80
               Granted                             --
               Exercised                           --
               Forfeited                       (11,526)              $  2.77
                                               -------

Balance at December 31, 1996                   572,678               $  2.80
               Granted                             --
               Exercised                           --
               Forfeited                           --
                                               -------
Balance at December 31, 1997                   572,678               $  2.80
                                               =======

         The Company has elected to apply the disclosure  only  requirements  of
         Statement of Financial  Accounting No. 123,  Accounting for Stock-Based
         Compensation ("SFAS 123") which, if fully adopted by the Company, would
         change the method the Company  applies in  recognizing  the cost of the
         Plan.  Adoption  of the  cost  recognition  provisions  of SFAS  123 is
         optional and the Company has decided not to elect those provisions.  As
         a result,  the Company  continues to apply Accounting  Principles Board
         Opinion No. 25 ("APB 25") and related interpretations in accounting for
         the measurement and recognition of the Plan's cost.

         The  shares  exercisable  for  vested  options  and  the  corresponding
         weighted  average exercise price was 435,436 shares and $2.80 per share
         at December 31, 1997 and 1996.

         Following  is a summary of stock  options  outstanding  at December 31,
         1997.

                        Options Outstanding                 Options Exercisable
                ---------------------------------------   ----------------------
                          Weighted Avg
  Range of               Remaining Term   Weighted Avg             Weighted Avg
Exercise Price   Shares    (in Years)    Exercise Price    Shares Exercise Price
- --------------  -------  --------------  --------------   ------- --------------
$2.625--$3.375  492,980        7.20              $2.63    376,194        $2.63
$3.376--$4.125   79,698        7.66              $3.91     59,242        $3.92
                -------                                   -------
$2.625--$4.125  572,678        7.27              $2.80    435,436        $2.80
                =======                                   =======

         The Company did not grant or reprice any options  during the year ended
         December 31, 1997 or 1996.

         Under SFAS 123, compensation cost is measured at the grant based on the
         fair value of the awards and is  recognized  over the  service  period,
         which is usually the vesting period.  The fair value of options granted
         during 1996 was  estimated on the date of grant using the Black Scholes
         option-pricing  model with the following  assumptions used to calculate
         fair value of options  awarded in 1996:  (i) average  dividend yield of
         0.00%; (ii) expected volatility of 83.36%;  (iii) expected life of five
         (5)  years;  and  (iv)  estimated  risk-free  interest  rate,  which is
         different  for grants  awarded on different  grant dates,  ranging from
         5.66% to 7.15%.

                                       34
<PAGE>
         The  pro  forma   disclosures  as  if  the  Company  adopted  the  cost
         recognition requirements of SFAS 123 are as follows (in thousands):

                                     1997                       1996
                          -------------------------   --------------------------
                          As Reported    Pro Forma     As Reported     Pro Forma
                             -------       -------       -------        ------- 
Net loss                     $(4,455)      $(4,455)      $(6,375)       $(6,476)
Earnings per common share    $ (0.91)      $ (0.91)      $ (1.67)       $ (1.70)

         The effects of applying  SFAS 123 in this proforma  disclosure  are not
         indicative of future  results.  SFAS 123 does not apply to awards prior
         to 1995.  Additional  awards in future years are not anticipated by the
         Company.

         Warrants

         Prior to the Company's  initial  public  offering,  the Company  issued
         warrants to the purchasers of the then  outstanding  Series E Preferred
         Stock  (the  "1993  Warrants").   Subject  to  adjustment  for  certain
         transactions, the 1993 Warrants, as originally issued, were exercisable
         for an aggregate of 353,531 shares of Common Stock at an exercise price
         of $9.90. Because of certain specified  anti-dilution  provisions,  the
         1993 Warrants were  exercisable  for an aggregate of 519,394  shares of
         Common Stock at a purchase  price of $5.60 per share as of December 31,
         1997. The 1993 Warrants are  exercisable at any time until November 30,
         1998 and are  entitled to the benefit of  adjustments  in the  exercise
         price and in the number of shares of Common  Stock or other  securities
         deliverable upon the exercise thereof in the event of a stock dividend,
         stock split, reclassification,  reorganization,  consolidation, merger,
         sale of all substantially all of the property of the Company,  or other
         dilutive transactions.

         The 1993  Warrants  are  redeemable  at the option of the  Company at a
         price equal to $.10 per share of the Common  Stock  covered by the 1993
         Warrant,  on 30 days written notice,  provided that the market price of
         the Common  Stock  equals or  exceeds  $12.544  for the 20  consecutive
         trading days ending  within 10 days prior to the notice of  redemption.
         The  Company  also  granted the  holders of the 1993  Warrants  certain
         registration  rights with  respect to the 1993  Warrants and the Common
         Stock for which the 1993 Warrants are exercisable.

         In connection  with its initial  public  offering,  the Company  issued
         3,898,550   Redeemable  Warrants  (the  "Redeemable   Warrants").   The
         Redeemable  Warrants  as  originally  issued  were  exercisable  for an
         aggregate of 3,893,550  shares of Common Stock at an exercise  price of
         $8.25  per  share.  Because  of  their  anti-dilution   provisions  the
         Redeemable  Warrants  were  exercisable  for an  aggregate of 5,646,798
         shares of  Common  Stock at a  purchase  price of $5.60 per share as of
         December 31, 1997. The Redeemable  Warrants are entitled to the benefit
         of  adjustment  in the  exercise  price and in the  number of shares of
         Common Stock or other securities  deliverable upon the exercise thereof
         in the  event  of a  stock  dividend,  stock  split,  reclassification,
         reorganization, consolidation, merger, sale of all or substantially all
         of the property of the Company,  or other  dilutive  transactions.  The
         Company  has the right to reduce the  exercise  price or  increase  the
         number of shares of Common  Stock  issuable  upon the  exercise  of the
         Redeemable Warrants.

         Each Redeemable  Warrant  expires on December 3, 1998 (the  "Expiration
         Date"),  subject to  extension.  The Company may at any time extend the
         Expiration  Date  of  all  outstanding  Redeemable  Warrants  for  such
         increased period of time as it may determine.

         The Company  has the right at any time after  March 3, 1995,  to redeem
         the Redeemable Warrants in whole or in part for cancellation at a price
         of $1.25 each, by written  notice to each  Redeemable  Warrant  holder.
         Such notice may only be given within 10 days following any period of 20
         consecutive  trading days during which the average  closing bid for the
         Common  Stock (if then trading on the  over-the-counter  market) or the

                                       35
<PAGE>
         average closing price of the Common Stock (if then listed on the Nasdaq
         Market) equals or exceeds $12.544 per share,  subject to adjustment for
         stock dividends,  splits and similar events. If the Redeemable Warrants
         are called in for  cancellation,  they must be  exercised  prior to the
         close of business on the date of any such  redemption and  cancellation
         or the right to  purchase  the  applicable  shares  of Common  Stock is
         forfeited.  The Company granted the holders of the Redeemable  Warrants
         certain  registration rights with respect to the Common Stock for which
         the Redeemable Warrants are exercisable.

         A summary of warrant activity is as follows:

                                                 Number of
                                                   Shares        Exercise Price
                                                 ---------     -----------------
Balance at December 31, 1995                     4,950,848     $8.04-- $3,572.27

  Warrants issued in connection with the 
    Series B Preferred Stock                       100,000              $2.00
  Warrants issued in connection with the
    Series A Preferred Stock                     1,537,696              $2.00
  1993 warrants anti-dilution provisions         1,112,973              $5.60
  Redeemable warrant anti-dilution provisions      102,371              $5.60
  Warrants converted to Common Stock                (4,168)
                                                 ---------

Balance at December 31, 1996                     7,799,720     $2.00-- $3,572.27

  Warrants issued in connection with the
    ProFutures Loan                                100,000              $1.84
  1993 warrants anti-dilution provisions               --
  Redeemable warrant anti-dilution provisions          --
  Warrants converted to Common Stock                (7,183)
                                                 ---------

Balance at January 31, 1997                      7,892,537     $1.84-- $3,752.27
                                                 =========

         No compensation  expense related to options and warrants was recognized
         by the Company in the accompanying  statement of operations  during the
         years ended December 31, 1997 or 1996.

         The Company has reserved  9,871,010 shares of Common Stock for issuance
         upon the exercise of all employee and nonemployee director Common Stock
         options and outstanding warrants.

11.      Preferred Stock

         The  Company's  Articles  of  Incorporation   authorize  the  board  of
         directors to issue  10,000,000  shares of preferred  stock from time to
         time in one or more series.  The board of directors  is  authorized  to
         determine,  prior to issuing  any such  series of  preferred  stock and
         without   any  vote  or  action  by  the   shareholders,   the  rights,
         preferences,  privileges and restrictions of the shares of such series,
         including  dividend  rights,  voting rights,  terms of redemption,  the
         provisions of any  purchase,  retirement or sinking fund to be provided
         for the shares of any  series,  conversion  and  exchange  rights,  the
         preferences  upon  any  distribution  of the  assets  of  the  Company,
         including  in  the  event  of  voluntary  of  involuntary  liquidation,
         dissolution  or  winding up of the  Company,  and the  preferences  and
         relative rights among each series of preferred stock.

         In February, March and May of 1996, the Company issued 3,075,318 shares
         of Series A 8% Cumulative  Convertible Redeemable Preferred Stock $1.00
         par value  ("Series A Preferred  Stock") and  Redeemable  Common  Stock
         Purchase Warrants to purchase  1,537,696 shares of the Company's Common

                                       36
<PAGE>
         Stock.  The net proceeds of the private  placement  were  approximately
         $2,972,000.  Each share of the Series A Preferred  Stock is immediately
         convertible  into one share of Common  Stock.  Each  Redeemable  Common
         Stock Purchase  Warrant is exercisable at a price of $2.00 per share of
         Common  Stock.   Each  Redeemable  Common  Stock  Purchase  Warrant  is
         exercisable  at a price  of $2.00  per  share of  Common  Stock.  Eight
         percent (8%)  dividends on the Series A Preferred  Stock may be paid in
         cash or the Series A Preferred  Stock at the discretion of the Company.
         The  Series A  Preferred  Stock is  senior  to the  Company's  Series B
         Preferred Stock and Common Stock in liquidation.  Holders of the Series
         A Preferred  Stock may vote on an as if  converted  basis on any matter
         requiring  shareholder  vote.  While the  Series A  Preferred  Stock is
         outstanding or any dividends  thereon  remain  unpaid,  no Common Stock
         dividends  may be  paid  or  declared  by the  Company.  The  Series  A
         Preferred  Stock may be redeemed in whole or in part,  at the option of
         the Company,  at any time  subsequent to March 1998 at a price of $1.46
         per share plus any  undeclared  and/or unpaid  dividends to the date of
         redemption.  Redemption  requires at least 30 days advanced  notice and
         notice may only be given if the Company's common stock has closed above
         $2.00 per share for the twenty  consecutive  trading  days prior to the
         notice.

         In  conjunction  with  the  issuance  of the  aforementioned  Series  A
         Preferred Stock, Uro-Tech converted amounts receivable from the Company
         totaling  $650,000 into 433,329 shares of Series A Preferred  Stock and
         216,671 Redeemable Stock Purchase Warrants.

         Series B Preferred Stock

         In  July  1996,  the  Company  issued  25,000  shares  of  Series  B 8%
         Cumulative  Convertible  Redeemable  Preferred  Stock  $1.00  par value
         ("Series B Preferred  Stock")  and Common  Stock  Purchase  Warrants to
         purchase up to 100,000  shares of its Common Stock,  par value $.01 per
         share. The Series B Preferred Stock plus Common Stock Purchase Warrants
         sold for  approximately  $50.00 per share of Series B Preferred  Stock.
         Subject to adjustment for certain  antidilution  events,  each share of
         Series B Preferred  Stock is  initially  convertible  into 25 shares of
         Common Stock and each Common Stock Purchase  Warrant is exercisable for
         one  share of Common  Stock at an  exercise  price of $2.00 per  share.
         Eight percent (8%) dividends on the Company's  Series B Preferred Stock
         may be paid in cash or in Series B Preferred  Stock,  at the discretion
         of the Company.  The series B Preferred Stock is junior to the Series A
         Preferred   Stock,   but  senior  to  the  Company's  Common  Stock  in
         liquidation.  The Series B Preferred  Stock has no voting  rights other
         than those  afforded  by law. As a class,  however,  the holders of the
         Series B Preferred  Stock may vote on matters  directly  affecting  the
         Series  B  Preferred  Stock or  mergers  and/or  consolidations  of the
         Company  with  another  company.  The Series B  Preferred  Stock may be
         redeemed in whole or in part, at the option of the Company, at any time
         subsequent to July 1998 at a price of $50 per share plus any undeclared
         and/or unpaid dividends to the date of redemption.  Redemption requires
         at least 30 days  advanced  notice  and notice may only be given if the
         Company's  common stock has closed above $2.00 per share for the twenty
         consecutive trading days prior to the notice.

         Dividends  may not be paid or declared on the  Company's  Common  Stock
         while any unpaid  dividends are  outstanding  on the Series B Preferred
         Stock.  The  Series B  Preferred  Stock and the Common  Stock  Purchase
         Warrants  are not  convertible  or  exercisable  until such time as the
         Company's   shareholders  approve  an  amendment  to  its  Articles  of
         Incorporation  increasing the number of the authorized shares of Common
         Stock by at least 2,500,000 shares.

         As of December 31, 1997 and 1996,  stated dividends that are undeclared
         and  unpaid  on the  Series A and  Series  B  Preferred  Stocks  are as
         follows:

                                   1997                1996
                                   ----                ----
                                        (in thousands)
         Series A                  $191                $134
         Series B                   150                  50
                                   ----                ----
                                   $341                $185
                                   ====                ====

         The Company  anticipates  that such dividends,  when declared,  will be
         paid in the shares of Series A and Series B Preferred Stock.

                                       37
<PAGE>
12.      Income Taxes

         The Company has incurred losses since its inception and, therefore, has
         not been subject to federal income taxes.  As of December 31, 1997, the
         Company had net  operating  loss ("NOL")  carryforwards  for income tax
         purposes of  approximately  $42,100,000  which  expire in 1999  through
         2012. Since the closing of the Company's IPO resulted in more than a 50
         percent change in shareholder ownership percentages,  the provisions of
         Section 382 of the Internal Revenue Code limit the Company's ability to
         utilize the NOL  carryforwards  to reduce future taxable income and tax
         liabilities.  Additionally,  because  United  States tax laws limit the
         time  during  which NOL  carryforwards  may be applied  against  future
         taxable income,  the Company will not be able to take full advantage of
         its NOL for federal  income tax  purposes  should the Company  generate
         taxable income.

         The  composition  of deferred tax assets and the related tax effects at
         December 31, 1997 and 1996 are as follows:

                                                          December 31,
                                                   1996                   1997
                                                 -------                -------
                                                         (in thousands)
Deferred tax assets:
    Net operating losses                         $14,620                $13,169
    Allowance for doubtful accounts and notes
       receivable                                    527                    367
    Inventory basis difference                       767                    860
    Accrued liabilities and reserves                 454                    456
    Valuation allowance                          (16,330)               (14,816)
                                                 -------                -------
       Total deferred tax assets                      38                     36
                                                 -------                -------

Deferred tax liabilities:
    Property and equipment                            16                     18
    Other                                             22                     18
                                                 -------                -------
       Total deferred tax liability......             38                     36
                                                 -------                -------

Net deferred tax asset (liability)               $   --                 $   --
                                                 =======                =======

         The  difference  between  the  income tax  benefit in the  accompanying
         statement  of  operations  and the amount that would result if the U.S.
         Federal  statutory  rate of 34%  were  applied  to  pre-tax  loss is as
         follows (amounts in thousands):

                                           1997                  1996
                                      --------------       -------------- 
                                      Amount       %        Amount      %
                                      ------    ----       ------    ----
Benefit for income tax at
    federal statutory rate            $1,514    34.0       $2,167    34.0
Increase in valuation allowance       (1,514   (34.0)      (2,167)  (34.0)
                                      ------    ----       ------    ----
                                      $  --      --        $  --      --
                                      ======    ====       ======    ====
13.      401(k) Plan

         The Positron  Corporation 401(k) Plan and Trust (the "Plan") covers all
         of the Company's employees who are United States citizens,  at least 21
         years of age and have  completed  at least one quarter of service  with
         the Company.  Pursuant to the Plan, employees may elect to reduce their
         current  compensation by up to the statutorily  prescribed annual limit
         and have the amount of such reduction contributed to the Plan. The Plan
         provides for the Company to make contributions in an amount equal to 25

                                       38
<PAGE>
         percent of the participant's deferral contributions, up to 6 percent of
         the  employee's  compensation,  as defined in the Plan  agreement.  The
         Company's contribution expense was approximately $12,000 and $35,000 in
         1997 and 1996, respectively.  The board of directors of the Company may
         authorize   additional   discretionary   contributions;   however,   no
         additional  Company  contributions  have been made as of  December  31,
         1997.

14.      Related Party Transactions

         The  Company  has  an  incentive  compensation  plan  for  certain  key
         employees and its Chairman.  The incentive  compensation  plan provides
         for annual bonus payments based upon  achievement of certain  corporate
         objectives  as  determined  by the  Company's  compensation  committee,
         subject to the approval of the board of directors. To date, the Company
         has not paid any bonuses pursuant to the incentive compensation plan.

         Pursuant  to  agreements  entered  into in November  1993,  the Company
         extended  loans to a current  board member and a former board member in
         order to provide  each of them with funds to satisfy  their  respective
         personal income tax liability  arising out of the conversion of certain
         Positron   Corporation   Promissory  Notes  into  Common  stock.   Such
         agreements  were entered into by the Company in connection with the IPO
         and in  consideration  of certain  concessions made by the board member
         and former board member  concerning  the  conversion  terms under their
         respective  Notes.  Pursuant to the agreements,  each of the loans were
         made on  substantially  the following terms: (i) limited to a principal
         amount not to exceed  $175,000,  (ii) interest payable at a rate of six
         percent  per  year,  (iii)  an  initial  term of three  years  with the
         principal  balance  being due and payable  upon the  expiration  of the
         term,   (iv)   limited   recourse   against  the   borrower,   and  (v)
         collateralized  by  Positron  Corporation  Common  Stock  owned  by the
         borrower.  In accordance with such  agreements,  on April 15, 1994, the
         Company  extended  a  $165,817  loan to a current  board  member  and a
         $158,552 loan to the former board member.

         Both of the notes receivable  matured in April 1997 but were not repaid
         by the debtors and, accordingly,  60,176 shares of the Company's Common
         Stock  reverted back to the Company and are included in treasury  stock
         at December 31, 1997. In connection with this transaction,  the Company
         recognized bad debt expense of $309,000.

         The Company has certain  consulting  agreements with its Chairman and a
         member of its board.  Each  agreement  provides for monthly  consulting
         payments of $6,667 and expires in 1998.

15.      Commitments and Contingencies

         On January 1, 1996,  the Company  entered into an employment  agreement
         with Werner J. Haas,  Ph.D.  pursuant to which Dr. Haas agreed to serve
         as President and Chief  Executive  Officer of the Company for a term of
         two years.  The  employment  agreement  provided  for the payment of an
         annual base salary of $200,000,  bonuses in an amount to be  determined
         at the  discretion  of the  Board  of  Directors  of the  Company,  and
         participation  in any employee  benefit plan adopted by the Company for
         its employees.

         On February 18, 1997,  Dr. Haas  informed the Board of Directors of the
         Company that he considered his contract to have been  terminated by the
         Company  without cause as a result of the Company's  failure to pay the
         February 15, 1997 payroll to any of its management  level employees and
         specifically to him. Additionally, Dr. Haas resigned as a member of the
         Company's  Board of  Directors.  Dr. Haas has demanded that the Company
         pay him all past due salary as well as the nine  months  severance  pay
         specified in his employment  agreement if his contract is determined to
         have been terminated without cause. The Company's maximum exposure with
         regard to Dr.  Haas'  employment  agreement is  approximately  $175,000
         should Dr. Haas  establish that he was  terminated  without cause.  The
         Company  believes,  and has indicated to Dr. Haas,  that no amounts are
         due him under his  employment  agreement.  Accordingly,  the  Company's
         potential loss with regard to this matter should fall within a range up
         to $175,000.  As of July 31, 1998, the Company is unable to predict the
         outcome of the disagreement between Dr. Haas and the Company.

                                       39
<PAGE>
         The Company is  obligated to pay  royalties of 3% of the gross  revenue
         from sales, uses, leases,  licensing or rentals of POSICAM systems,  1%
         each to a director  of the Company  and two other  unrelated  entities.
         During the years ended December 31, 1997 and 1996 the Company  incurred
         royalties  of $134,000  and  $42,000,  respectively,  based upon system
         sales and adjustments to royalties.

         The  Company's  royalties  were  reduced  to the 3%  level  based  upon
         consideration,   provided  to  two  of  the  payees,  under  consulting
         agreements and promissory  notes.  However,  the consulting  agreements
         provide  that  if  the  Company  defaults  in its  payment  obligations
         thereunder, then the payees would be entitled to receive regrant of the
         royalties  that they  previously  released.  In April 1998, the Company
         received a demand letter from one of the payees alleging  default under
         his consulting agreement in 1997 and demanding regrant of an additional
         1% royalty  interest.  Although  the Company has not  received a demand
         from the second payee,  the Company believes that a payment default may
         have  occurred  under  his  consulting  agreement  and that as a result
         thereof,  he may be  entitled  to the  regrant  of an  additional  0.5%
         royalty  interest.   The  Company  anticipates   initiating  settlement
         discussions with both payees  concerning the alleged payment  defaults.
         The  Company is unable to predict the  outcome of such  discussions  at
         this time; however, the Company recorded an adjustment of approximately
         $100,000 during 1997 in recognition of the additional  royalties it may
         owe.  If the  parties  fail to reach a  settlement,  one payee  will be
         entitled to receive an  aggregate  2% royalty and the second payee will
         be entitled  to receive an  aggregate  1.5%  royalty,  resulting  in an
         increase of the Company's  royalty  obligations  from 3% to 4.5%.  Such
         increase in royalty obligations could have a material adverse effect on
         the Company's future financial performance.

         During 1997, the Company leased its office and  manufacturing  facility
         and certain office equipment under noncancelable  operating leases with
         unexpired  terms  ranging  from one to four years.  Rental  expense for
         operating  leases amounted to  approximately  $256,000 per year for the
         years ended  December 31, 1997 and 1996,  respectively.  Future minimum
         lease payments due under  noncancelable  operating leases with original
         lease terms of greater than one year and expiration dates subsequent to
         December 31, 1997, are summarized as follows:

                                                  Amount
         Year Ended December 31,              (In thousands)
         -----------------------              --------------
         1998                                      $361
         1999                                       421
         2000                                       210
                                              --------------
         Total minimum lease payments              $992
                                              ==============    

         In March 1998,  the Company,  under severe cash flow  constraints,  was
         forced to leave its long-term office and  manufacturing  facility lease
         and move its operations to a facility with significantly  reduced space
         and a  more  affordable  lease  payment.  The  Company  entered  into a
         six-month lease at a monthly rate of $2,671;  however,  the Company was
         unable to obtain a release  from its  original  lease.  The Company has
         been notified by its former  landlord that all  delinquent  amounts due
         under  its  original  lease are  currently  payable.  However,  Company
         management  believes  that the  landlord  has  leased  its space to new
         tenants at  favorable  lease rates and that its  exposure is limited to
         any shortfall in lease payments experienced by the former landlord. The
         Company  believes that its maximum  exposure  related to the lease with
         its former landlord is approximately  $950,000,  based on the remaining
         future payments due at the date the lease was abandoned.  However,  the
         Company  believes  that the amounts due the landlord  will be offset by
         payments  from  the  current  tenant  and  will  not  exceed   $50,000.
         Accordingly,  the Company's  potential loss related to its former lease
         should fall in the range from $50,000 to $950,000. As of July 31, 1998,
         the Company is unable to predict the outcome of this  disagreement with
         its former landlord.

                                       40
<PAGE>
         Impact of Year 2000

         The Year 2000 issue is the result of computer  programs  being  written
         using two digits rather than four to define the applicable year. Any of
         the Company's  computer programs that have time sensitive  software may
         recognize a date using "00" as the year 1900 rather than the year 2000.
         This  could  result in a system  failure  or  miscalculation  causing a
         disruption of business activities.

         The Company has  performed  only a  preliminary  assessment of the Year
         2000  issue   using  a  broad   overview   and   management's   current
         understanding  of its information and  non-information  systems and its
         informal  understanding of the information and non-information  systems
         of its significant suppliers and major customers.  None of the detailed
         tasks  necessary to properly assess the Year 2000 issue (such as direct
         coordination  with  vendors,  customers  and  manufacturers)  have been
         performed.

         Based on its  preliminary  assessment,  the  Company  believes  that no
         significant  modifications to its computer software or hardware will be
         required and that its existing computer systems (including  information
         systems,  non-information  systems using date sensitive  embedded chips
         and its POSICAMTM systems) will function properly with respect to dates
         in  the  year  2000  and  thereafter.   Based  upon  such   preliminary
         assessment,  the Company also  currently  believes that costs to modify
         the Company's existing computer hardware and software systems in regard
         to the Year 2000 issue will not be significant.  However, the Year 2000
         issue is extremely  complex and the costs to properly assess its impact
         on  the  Company  and  to  correct  associated  problems  may  be  very
         significant.

         Based on the Company's preliminary assessment of its relationships with
         significant  suppliers and major  customers to understand the extent to
         which the  Company is  vulnerable  to any  failure by third  parties to
         remedy their own Year 2000 issues, management believes that the Company
         does not have  significant  exposure  with  respect  to third  parties.
         However, the Company's preliminary assessments indicated that the worst
         case  scenario  with  regard to the Year 2000 issue  would be delays in
         receiving parts and materials  needed for  manufacturing  and delays by
         customers in making payments for fee-per-scan and maintenance services.
         In the Company's current financial  position,  such circumstances could
         threaten the Company's continued existence.

         Due to the Company's current severe liquidity problems, the Company has
         not had the  financial  resources to perform a complete  assessment  of
         Year  2000  issues  or  assess  the  potential   cost  or  develop  any
         contingency  plan with regard to Year 2000  issues that may arise.  The
         Company  is unable to  predict at the  current  time,  when and to what
         extent it may further  pursue its  assessment  of  potential  Year 2000
         issues and the development of any contingency plans in respect thereof.
         If the  Company  is able to obtain  necessary  financial  resources,  a
         complete  assessment  of the Year 2000 issues  facing the Company  will
         likely be completed in the first half of 1999.

16.      Subsequent Events

         In May 1998,  the  Company  entered  into an  agreement  (the  "Imatron
         Transaction")  with  Imatron  Inc.  ("Imatron"),  whereby  Imatron will
         acquire a majority  ownership of the Company.  In conjunction  with the
         execution  of  definitive  agreements,  Imatron  began  making  working
         capital advances available to the Company up to $500,000  (subsequently
         revised by oral  agreement  to $750,000) in order to enable the Company
         to meet a portion of its current obligations. As of September 30, 1998,
         the Company had received advances totaling approximately  $568,000. The
         advances  bear  interest at 1/2% over the prime rate,  are due March 1,
         2000 (with interest being payable  monthly),  and are secured by all of
         the Company's assets.

                                       41
<PAGE>
         Under the terms of the agreement, Imatron will acquire ownership of 51%
         of the outstanding  Common Stock of the Company on a fully-diluted  and
         as-if converted  basis,  which assumes that all  outstanding  warrants,
         options and other  derivatives  have been  exercised or converted  into
         shares of Common  Stock  other  than  out-of-  the-money  warrants  and
         options,  determined  at the time of issuance of shares to Imatron.  If
         such shares were issued to Imatron on September  30, 1998,  the Company
         would have been  obligated to issue  9,000,000  shares of Common Stock.
         The Company  will receive a nominal cash amount of $100 from Imatron in
         payment for the shares.

         In addition to providing limited working capital financing, Imatron has
         agreed to support the Company's  marketing  program,  particularly with
         regard to Imatron's affiliate, Imatron Japan, Inc. ("Imatron Japan") by
         agreeing to make, after the share issuance closing date, all reasonable
         efforts to cause the placement of 10 POSICAM(TM)  systems over the next
         three  years.  The Company  recently  shipped a  POSICAM(TM)  system to
         Imatron  Japan as the first  delivery  under a three-year  distribution
         agreement entered into last year.  Imatron Japan is a major distributor
         for Imatron's  Ultrafast CT and for the equipment of certain other high
         technology  companies.  Imatron has a 24% minority  interest in Imatron
         Japan.  Imatron has also agreed to help facilitate the recapitalization
         of the  Company and to support its  re-entry  into the medical  imaging
         market by using its best efforts after the share issuance  closing date
         to arrange for additional  third-party equity financing for the Company
         over an  18-month  period  in an  aggregate  amount  of not  less  than
         $8,000,000.  There can be no assurances,  however,  that any such sales
         will  actually  be   consummated  or  that  Imatron  will  be  able  to
         successfully assist the Company in raising additional capital.

         Consummation of the issuance of shares to Imatron is conditioned  upon,
         among other things, (a) the resignation of each officer of the Company,
         (b) the resignation of at least three of the four current  directors of
         the  Company and the  appointment  of  Imatron's  nominees to fill such
         vacancies,  and (c) shareholder approval of the Company of an amendment
         to the Company's  Articles of  Incorporation to increase its authorized
         Common Stock to at least 100,000,000  shares.  The Company  anticipates
         that the share  issuance to Imatron  will close  immediately  after the
         Annual Meeting if the required shareholder approval is obtained.

         In connection with the above transactions, the Company, Imatron and two
         current lenders to the Company,  Uro-Tech and ProFutures,  entered into
         certain  agreements whereby (a) ProFutures waived all past defaults and
         extended the maturity of the ProFutures Loan (with a current balance of
         approximately  $570,000)  to December 5, 1998,  in return for a $50,000
         payment,  the  issuance of warrants  to  purchase  1,150,000  shares of
         Common  Stock at $0.25  per  share  (in  addition  to the  issuance  of
         previously  bargained  for warrants to purchase an  additional  100,000
         shares of Common Stock at $0.25 per share), and minimum loan repayments
         of $50,000  for each of the months of April,  May,  June and July 1998,
         $100,000  for the  month of  August  1998 and  $50,000  for each of the
         months of September,  October and November  1998, (b) Imatron agreed to
         subordinate  its loan to the ProFutures  Loan,  (c) Uro-Tech  agreed to
         subordinate its loan (with a current balance of approximately  $767,000
         plus accrued interest  payable of approximately  $286,000) to Imatron's
         loan,  and (d) ProFutures and Imatron agreed that all amounts above the
         first $1,000,000 of any third-party  equity financing raised by Imatron
         would  be  applied  equally  to  reduce  the  Company's  debt  to  both
         ProFutures  and  Imatron.  Consistent  with the oral  amendment  to the
         Imatron  Agreement,  the  Company and  ProFutures  have  amended  their
         agreements  to provide  further  waivers of any past  defaults and have
         further  extended  the maturity of the  ProFutures  Loan to December 5,
         1998 and minimum loan  repayments  of $50,000 for each of the months of
         September,  October and November 1998, leaving a balance at December 5,
         1998  of  approximately   $400,000.   Imatron  agreed  to  continue  to
         subordinate  its loan to the ProFutures  Loan,  and Uro-Tech  agreed to
         subordinate  its loan to  Imatron's  loan.  Except as  modified  by the
         amendments, the remaining agreements remain the same.

                                       42
<PAGE>
         The Company is in negotiations  to sell one of its POSICAM(TM)  systems
         to a third party that  currently  leases the system.  It is anticipated
         that, if the Company is successful in  consummating  such sale, it will
         receive net proceeds of  approximately  $360,000.  It is the  Company's
         intention to use such proceeds,  plus proceeds from a service  contract
         currently  being  negotiated  with  the  third  party,  to  retire  the
         remaining  balance of  approximately  $400,000 on the ProFutures  Loan.
         There  can  be  no  assurances,  however,  that  the  Company  will  be
         successful in reaching an agreement concerning the proposed system sale
         or that,  if agreement is reached,  such sale will be  consummated,  or
         that the Company  otherwise will be able to obtain  additional  debt or
         equity  financing  necessary  to  repay  the  ProFutures  Loan  by such
         maturity date.  Absent obtaining a further extension of the December 5,
         1998 maturity date of the ProFutures Loan, closing the proposed sale of
         the  POSICAM(TM)  system,  or  obtaining   additional  debt  or  equity
         financing  necessary to repay the ProFutures Loan by the maturity date,
         the  Company  may be  forced  to  seek  protection  under  the  Federal
         Bankruptcy laws.

         If the proposal to amend the Company's Articles of Incorporation is not
         approved by the Company's shareholders, or if such proposal is approved
         but the Imatron  Transaction does not  subsequently  close, the Company
         may be forced to seek  protection  under the Federal  Bankruptcy  laws.
         Even if Proposal Two to amend the Company's  Articles of  Incorporation
         is  approved  and  the  Imatron  Transaction  closes,  there  can be no
         assurances that the Company will thereafter be able to raise sufficient
         capital for the Company to continue as a going  concern or even if such
         additional  capital is raised  that the Company  will ever  achieve the
         level of  revenues  needed  to be  profitable  in the  future,  or,  if
         profitability is achieved, that it will be sustained.

         In February  1998,  certain  taxing  authorities  filed  legal  actions
         against the Company to collect certain past due property taxes, penalty
         and interest totaling $241,307,  and these amounts have been considered
         in the financial  statements  at December 31, 1997. In connection  with
         such  legal  actions,  the  taxing  authorities  filed  liens  covering
         substantially all inventory,  furniture,  fixtures and equipment of the
         Company.

17.      Supplemental Cash Flow Data

Supplemental disclosure of cash flow information:
             Cash paid for interest                         $ 277          $ 139
                                                            =====          =====
             Cash paid for income taxes                      $--            $--
                                                            =====          =====

Non-cash investing and financing activities:
             Conversion of note payable to an
             affiliate into Series A Preferred Stock         $--           $ 650
                                                            =====          =====


                                       43
<PAGE>

                             PROFORMA FINANCIAL DATA

             The board of directors of the Company is currently  considering the
sale of  9,000,000  shares of its Common  Stock (or such other  number of shares
that constitutes 51% of the Company's  outstanding  voting securities on a fully
diluted basis,  exclusive of out of the money warrants,  and/or options,  and/or
convertible  securities  calculated  as of the closing  date,  but not less than
9,000,000  shares) in a transaction  (the "Imatron  Transaction")  with Imatron,
Inc.  ("Imatron"),  a New  Jersey  corporation  with  principal  offices  in San
Francisco,  California.  The total  consideration to be paid by Imatron for such
shares is $100 plus the  reimbursement  of certain  costs to be  incurred by the
Company as a result of the transaction,  which costs are estimated not to exceed
$25,000.  The following Unaudited Proforma Statements of Operations for the nine
months ended September 30, 1998 and the year ended December 31, 1997 give effect
to the  Imatron  Transaction  as if it had  occurred  on  January  1,  1997.  An
Unaudited  Proforma  Condensed  Balance  Sheet as of  September  30, 1998 is not
presented because the impact of the Imatron  Transaction on the balance sheet is
not material.

             The Unaudited  Proforma  Statements of Operations are presented for
informational purposes only and are not necessarily indicative of the results of
operations that would have been achieved had the  transaction  been completed at
January 1, 1997,  nor are they  indicative  of the Company's  future  results of
operations.

             The Unaudited  Proforma  Statements of Operations should be read in
conjunction with the historical  financial statements of the Company and related
notes thereto.



                                       44
<PAGE>
<TABLE>
                                                        POSITRON CORPORATION
                                                  PROFORMA STATEMENT OF OPERATIONS
                                                  --------------------------------
                                                  (In thousands, except share data)
<CAPTION>
                                                                                              Nine Months Ended         Year Ended
                                                                                             September 30, 1998    December 31, 1997

<S>                                                                                              <C>                   <C>         
Revenues:
    System sales                                                                                 $       --            $      1,129
    Fee per scan                                                                                          454                   602
    Service and component                                                                                 933                 1,795
                                                                                                 ------------          ------------
      Total revenues                                                                                    1.387                 3,526
                                                                                                 ------------          ------------
Cost of sales and services:
    System sales                                                                                         --                     698
    Fee per scan                                                                                           89                   156
    Service, warranty and component                                                                       286                   645
                                                                                                 ------------          ------------
      Total costs of sales and service                                                                    375                 1,499
                                                                                                 ------------          ------------
      Gross profit                                                                                      1,012                 2,027
                                                                                                 ------------          ------------
Operating Expenses:
    Research and development                                                                               18                 1,305
    Selling, general and administrative expenses                                                        1,750                 4,753
                                                                                                 ------------          ------------
      Total operating costs                                                                             1,768                 6,058
                                                                                                 ------------          ------------
Loss from operations                                                                                     (756)               (4,031)
                                                                                                 ------------          ------------
Other expenses:
    Interest expense                                                                                     (228)                 (335)
    Other expense                                                                                        --                    (190)
                                                                                                 ------------          ------------
      Total other expense                                                                                (228)                 (424)
                                                                                                 ------------          ------------
Net loss                                                                                         $       (984)         $     (4,455)
                                                                                                 ============          ============
Basic and dilutive net loss per common share as reported                                         $      (0.19)         $      (0.91)
                                                                                                 ============          ============
Proforma basic and dilutive net loss per common share                                            $      (0.07)         $      (0.32)
                                                                                                 ============          ============
Weighted average common shares outstanding                                                          5,144,291             4,884,870

Additional shares to be issued in connection with the proposed Imatron
    Transaction                                                                                     9,000,000             9,000,000
                                                                                                 ------------          ------------
Proforma weighted average shares outstanding                                                       14,144,291            13,884,870
                                                                                                 ============          ============
<FN>
                                      See notes to unaudited proforma statements of operations.
</FN>
                                                                 45
</TABLE>
<PAGE>
                              POSITRON CORPORATION
                   NOTES TO UNAUDITED STATEMENTS OF OPERATIONS
                   -------------------------------------------

1.       Basis of Presentation

         The Unaudited  Proforma  Statements  of Operations  for the nine months
ended September 30, 1998 and the year ended December 31, 1997 give effect to the
Imatron Transaction as if it had occurred at January 1, 1997.

         The  Company  believes  that  the  assumptions  used in  preparing  the
unaudited  proforma  statements  of  operations  provide a reasonable  basis for
presenting all of the significant effects of the Imatron Transaction (other than
any synergies  anticipated by the Company,  and  nonrecurring  charges  directly
attributable  to the sale),  and that the  proforma  adjustments  give effect to
those assumptions in the Unaudited Proforma Statements of Operations.

2.       Earnings Per Share

         Net loss per share of Common  Stock was  computed by  dividing  the net
income  available to holders of Common Stock by the weighted  average  number of
shares of Common Stock outstanding  during the period.  Due to the net loss, all
of the Common Stock equivalents were excluded from this calculation due to their
anti-dilutive effect.

3.       Proforma Adjustments

         Proforma adjustments to the Unaudited Proforma Statements of Operations
are as follows:

         1.       Reflects the  issuance of 9,000,000  shares of Common Stock in
                  connection with the Imatron Transaction.

         2.       Reflects the  calculation  of earnings per share  assuming the
                  sale of 9,000,000 shares of Common Stock to Imatron.


                                       46
<PAGE>
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Risks Associated with Business Activities

         Potential Default Under ProFutures Loan. The ProFutures Loan matures on
December 5, 1998 and, at that time, approximately $400,000 will be due under the
ProFutures Loan.  Unless the maturity date of the ProFutures Loan is extended or
the  Company is  successful  in  obtaining  additional  funds  through a sale of
certain  of its  assets  or  additional  debt or equity  financing  in an amount
necessary to discharge the  ProFutures  Loan prior to its maturity,  the Company
will be  unable  to pay  when due the  ProFutures  Loan  and a  payment  default
thereunder  will occur.  The  ProFutures  Loan is secured by liens and  security
interests  encumbering  all of the assets of the  Company,  including  know-how,
patents and proprietary rights pertaining to its PET technology.  Upon a payment
default  under the  ProFutures  Loan,  the Company  anticipates  that the lender
thereunder will seek to foreclose its liens and security  interests  encumbering
the Company's  assets.  Such foreclosure would have a material adverse affect on
the  Company  and  its  securityholders  and  would  prevent  the  Company  from
continuing as a going concern. The Company is in negotiations to sell one of its
POSICAM(TM)  systems to a third party that  currently  leases the system.  It is
anticipated  that, if the Company is successful  in  consummating  such sale, it
will  receive  net  proceeds  of  approximately  $360,000.  It is the  Company's
intention to use such proceeds,  plus proceeds from a service contract currently
being  negotiated  with the third  party,  to retire  the  remaining  balance of
approximately  $400,000  on the  ProFutures  Loan.  There can be no  assurances,
however, that the Company will be successful in reaching an agreement concerning
the proposed  system sale or that,  if  agreement is reached,  such sale will be
consummated,  or that the Company  otherwise  will be able to obtain  additional
debt or equity financing necessary to repay the ProFutures Loan by such maturity
date. Absent obtaining a further extension of the December 5, 1998 maturity date
of the ProFutures Loan, closing the proposed sale of the POSICAM(TM)  system, or
obtaining  additional debt or equity financing necessary to repay the ProFutures
Loan by the maturity  date, the Company may be forced to seek  protection  under
the Federal Bankruptcy laws.

         History  of  Losses.  To date  the  Company  has  been  unable  to sell
POSICAM(TM) systems at quantities sufficient to be profitable. Consequently, the
Company  has  sustained  substantial  losses.  Net  losses  for the years  ended
December 31, 1997 and 1996 were  $4,455,000  and  $6,375,000,  respectively.  At
December  31,  1997,  the Company had an  accumulated  deficit of  approximately
$48,960,000. If the proposal to amend the Company's Articles of Incorporation is
not approved by the Company's shareholders,  or if such proposal is approved but
the Imatron  Transaction does not subsequently  close, the Company may be forced
to seek protection  under the Federal  Bankruptcy  laws. Even if the proposal to
amend the  Company's  Articles  of  Incorporation  is  approved  and the Imatron
Transaction closes,  there can be no assurances that the Company will thereafter
be able to raise  sufficient  capital  for the  Company to  continue  as a going
concern or even if such additional  capital is raised that the Company will ever
achieve  the level of revenues  needed to be  profitable  in the future,  or, if
profitability is achieved, that it will be sustained.  Due to the sizeable sales
price of each POSICAM(TM) system and the limited number of systems that are sold
or  placed in  service  in each  fiscal  period,  the  Company's  revenues  have
fluctuated, and may likely continue to fluctuate,  significantly from quarter to
quarter and from year to year.

         Recruiting and Retention of Qualified Personnel.  The Company's success
is dependent to a significant  degree upon the efforts of its executive officers
and key employees.  The loss or unavailability of the services of any of its key
personnel  could have a material  adverse  effect on the Company.  The Company's
success is also  dependent  upon its  ability to  attract  and retain  qualified
personnel in all areas of its business,  particularly  management,  research and
marketing.  Given the Company's  current  financial  situation,  there can be no
assurance  that  the  Company  will be able to  continue  to hire  and  retain a
sufficient number of qualified personnel. If the Company is unable to retain and
attract such qualified  personnel,  its business and operating  results could be
adversely affected.

         Working Capital Deficiency.  At December 31, 1997, the Company had cash
and cash equivalents in the amount of $160,000  compared to $382,000 at December
31, 1996. Throughout much of 1997 and the first nine months of 1998, the Company
has been unable to meet certain of its obligations as they came due. As a result
of the Company's  liquidity problem,  the payment of salaries and other benefits
to certain  management level employees  (totaling  approximately  $700,000) were
deferred at December 31, 1997. During the first nine months of 1998, the Company
made  payments to such  management  level  employees to reduce its liability for

                                       47
<PAGE>
past due salaries  and wages to  approximately  $600,000 at September  30, 1998.
Additionally, the Company is in arrears to many of its vendors and suppliers. As
of  September  30,  1998,  such  amount owed to vendors  and  suppliers  totaled
approximately $1,327,000.

         Substantial  Competition  and  Effects  of  Technological  Change.  The
industry  in which the  Company is  engaged is subject to rapid and  significant
technological  change. There can be no assurance that POSICAM(TM) systems can be
upgraded to meet future innovations in the PET industry or that new technologies
will not emerge,  or existing  technologies  will not be  improved,  which would
render the Company's  products  obsolete or  non-competitive.  The Company faces
competition  in the United  States PET market  primarily  from General  Electric
Company and Siemens Medical Systems,  Inc., two major commercial  manufacturers,
each of which has significantly  greater  financial and technical  resources and
production and marketing  capabilities than the Company. In addition,  there can
be no  assurance  that other  established  medical  concern,  any of which would
likely have greater resources than the Company,  will not enter the market.  The
Company also faces  competition from other imaging  technologies  which are more
firmly established and have a greater market acceptance, including single-photon
emission  computed  tomography  ("SPECT").  There can be no  assurance  that the
Company will be able to compete successfully against any of its competitors.

         No Assurance of Market Acceptance.  The POSICAM(TM) systems involve new
technology  that  competes  with more  established  diagnostic  techniques.  The
purchase  and  installation  of a PET  system  involves  a  significant  capital
expenditure on the part of the purchaser.  A potential purchaser of a PET system
must  have an  available  patient  base  that is large  enough  to  provide  the
utilization  rate needed to justify  such capital  expenditure.  There can be no
assurance  that PET  technology  or the  Company's  POSICAM(TM)  systems will be
accepted  by the  target  markets  or that the  Company's  sales of  POSICAM(TM)
systems will increase or that the Company will ever be profitable.

         Patents and  Proprietary  Technology.  The Company holds certain patent
and trade secret rights relating to various aspects of its PET technology, which
are of material importance to the Company and it future prospects.  There can be
no assurance,  however,  that the Company's  patents will provide the meaningful
protection from competitors. Even if a competitor's products were to infringe on
patents held by the  Company,  it would be costly for the Company to enforce its
rights and the  enforcement  of its rights would divert funds and resources from
the  Company's  operations.  Furthermore,  there  can be no  assurance  that the
Company's products will not infringe on any patents of others.

         The Company  requires each employee  and/or  consultant to enter into a
confidentiality  agreement,  but there can be no assurance that these agreements
will provide meaningful  protection or adequate remedies for the Company's trade
secrets or proprietary  know-how in the event of unauthorized  use or disclosure
of such information or that others will not independently  develop substantially
equivalent  proprietary  information  and techniques or otherwise gain access to
the Company's trade secrets and proprietary know-how.

         Government  Regulation.  The  Company's  POSICAM(TM)  systems  and  the
radiopharmaceuticals  used in connection  with them are subject to regulation by
the FDA. The FDA regulates and must approve the clinical testing, manufacturing,
labeling,  distribution,  and promotion of medical devices in the United States.
There can be no assurance  that any additional  product or enhancement  that the
Company may develop will be approved by the FDA. Delays in receiving  regulatory
approval  could have a material  adverse  effect on the Company's  business.  In
addition,  various foreign countries in which the Company's  products are or may
be marketed impose additional  regulatory  requirements.  Further, the Company's
operations  and the  operations of PET systems are subject to  regulation  under
federal and state health safety laws,  and  purchasers  and users of PET systems
are subject to federal and state laws and regulations  regarding the purchase of
medical equipment such as PET systems. All laws and regulations, including those
specifically  applicable  to the  Company,  are  subject to change.  The Company
cannot  predict what effect  changes in laws and  regulations  might have on its
business.  Failure to comply with  applicable  laws and regulatory  requirements
could  have a  material  adverse  effect on the  Company's  business,  financial
conditions, results of operations and cash flows.

         Certain  Financing  Arrangements.  In  order  to sell  its  POSICAM(TM)
systems,  the Company has from time to time found it necessary to participate in
ventures with certain customers or otherwise assist customers in their financing
arrangements.  The venture  arrangements have involved lower cash prices for the
Company's  systems in exchange for interests in the ventures,  thus exposing the
Company to the attendant  business  risks of the  ventures.  The Company has, in
certain instances, sold its systems to financial intermediaries,  which have, in
turn,  leased the system to users.  Such  transactions  may not give rise to the
same economic benefit to the Company as would have occurred had the Company made

                                       48
<PAGE>
a direct cash sale at its normal market  prices on normal sale terms.  There can
be no  assurance  that the  Company  will not find it  necessary  to enter  into
similar  transactions  to effect  future  sales.  The  nature  and extent of the
Company's  interest in such ventures or the existence of  remarketing or similar
obligations  could  require  the  Company to account  for such  transactions  as
financing  arrangements  rather than "sales" for financial  reporting  purposes.
Such treatment  could have the effect of delaying the  recognition of revenue on
such  transactions  and may increase the  volatility of the Company's  financial
results.

         Product  Liability and  Insurance.  The use of the  Company's  products
entails  risks of product  liability.  There can be no  assurance  that  product
liability  claims will not be  successfully  asserted  against the Company.  The
Company maintains  liability  insurance coverage in the amount of $2 million per
occurrence and an annual aggregate maximum of $3 million.  However, there can be
no  assurance  that the Company will be able to maintain  such  insurance in the
future or, if  maintained,  that such  insurance will be sufficient in amount to
cover any successful product liability claims.
Any uninsured liability could have a material adverse effect on the Company.

         No Dividends.  The Company has never paid cash  dividends on its Common
Stock  and does not  intend to pay cash  dividends  on its  Common  Stock in the
foreseeable  future.  The Series A Preferred  Stock and Series B Preferred Stock
Statements of Designation  prohibit the payment of Common Stock  dividends until
all required  dividends have been paid on each series of preferred  stock. As of
December  31, 1997,  approximately  $433,000 of preferred  stock  dividends  are
undeclared and unpaid by the Company.

Management's Discussion and Analysis of Plan of Operation

         General.  The Company was  incorporated  in December 1983 and commenced
commercial  operations  in 1986.  Since that time,  the  Company  has  generated
revenues  primarily from the sale and service contract revenues derived from the
Company's POSICAM(TM) systems; 15 of which are currently in operation in certain
medical facilities in the United States. The Company has never been able to sell
its POSICAM(TM)  systems in sufficient  quantities to achieve  profitability and
should the  Company be unable to  complete  the  Imatron  Transaction  discussed
below, the Company does not have sufficient  capital to repay secured  creditors
as  obligations  mature and will,  in all  likelihood,  be unable to continue in
operation.

         Imatron Transaction.  In May 1998, the Company entered into the Imatron
Agreement,  whereby Imatron will acquire a majority ownership of the Company. In
conjunction  with the execution of definitive  agreements,  Imatron began making
working capital advances  available to the Company up to $500,000  (subsequently
revised by oral  agreement  to $750,000) in order to enable it to meet a portion
of its current  obligations.  As of September 30, 1998, the Company had borrowed
$568,000.  The loan bears  interest at 1/2% over the prime rate, is due March 1,
2000  (with  interest  being  payable  monthly),  and is  secured  by all of the
Company's assets.

         Under the terms of the agreement, Imatron will acquire ownership of 51%
of the  outstanding  Common  Stock of the Company on a  fully-diluted  and as-if
converted basis, which assumes that all outstanding warrants,  options and other
derivatives  have been  exercised or converted into shares of Common Stock other
than out-of-the-money  warrants and options,  determined at the time of issuance
of shares of Common  Stock to Imatron.  If such shares were issued to Imatron on
September  30, 1998,  the Company would have been  obligated to issue  9,000,000
shares of Common Stock.  The Company will receive a nominal cash payment of $100
from Imatron in payment for the shares of Common Stock.

         In addition to providing limited working capital financing, Imatron has
agreed to support the Company's  marketing program,  particularly with regard to
Imatron's affiliate,  Imatron Japan, Inc. ("Imatron Japan") by agreeing to make,
after the share  issuance  closing  date,  all  reasonable  efforts to cause the
placement of 10 POSICAM(TM)  positron emission  tomography  ("PET") cameras over
the next three years.  The Company  recently shipped a POSICAM(TM) PET camera to
Imatron Japan as the first  delivery under a three-year  distribution  agreement
entered  into last year.  Imatron  Japan is a major  distributor  for  Imatron's
Ultrafast CT and for the equipment of certain other high  technology  companies.
Imatron has a 24% minority interest in Imatron Japan. Imatron has also agreed to
help facilitate the recapitalization of the Company to support its re-entry into
the medical  imaging  market by using its best efforts after the share  issuance
closing date to arrange for  additional  third-party  equity  financing  for the
Company  over an  18-month  period  in an  aggregate  amount  of not  less  than
$8,000,000.  There  can be no  assurances,  however,  that any such  sales  will
actually be consummated or that Imatron will be able to successfully  assist the
Company in raising additional capital.

                                       49
<PAGE>
         Consummation of the issuance of shares to Imatron is conditioned  upon,
among other things (a) the  resignation of each officer of the Company,  (b) the
resignation  of at least three of the four current  directors of the Company and
the  appointment  of  Imatron's  nominees  to  fill  such  vacancies,   and  (c)
shareholder  approval of an amendment to the Company's Articles of Incorporation
to increase its authorized Common Stock to at least 100,000,000 shares of Common
Stock.  The Company  anticipates  that the share  issuance to Imatron will close
immediately  after the Annual  Meeting if the required  shareholder  approval is
obtained.

         In connection with the above transactions, the Company, Imatron and two
current  lenders to the Company,  Uro-Tech,  Ltd.  ("Uro-Tech")  and  ProFutures
Bridge  Capital  Fund,  L.P.  ("ProFutures"),  entered into  certain  agreements
whereby (a) ProFutures waived all past defaults and extended the maturity of its
loan (with a current balance of approximately  $570,000) (the "ProFutures Loan")
to December 5, 1998, in return for a $50,000  payment,  the issuance of warrants
to purchase  1,150,000 shares of Common Stock at $0.25 per share (in addition to
the issuance of  previously  bargained  for  warrants to purchase an  additional
100,000 shares of Common Stock at $0.25 per share),  and minimum loan repayments
of $50,000 for each of the months of April,  May,  June and July 1998,  $100,000
for the month of August 1998 and  $50,000  for each of the months of  September,
October  and  November  1998,  (b)  Imatron  agreed to  subordinate  its loan to
ProFutures'  loan, (c) Uro-Tech  agreed to subordinate  its loan (with a current
balance of approximately $767,000 plus accrued interest payable of approximately
$286,000) to Imatron's  loan,  and (d)  ProFutures  and Imatron  agreed that all
amounts above the first $1,000,000 of any third-party  equity financing obtained
by  Imatron  would be  applied  equally  to reduce  the  Company's  debt to both
ProFutures  and  Imatron.  Consistent  with the oral  amendment  to the  Imatron
Agreement,  the Company and ProFutures have amended their  agreements to provide
further  waivers of any past defaults and have further  extended the maturity of
the ProFutures  Loan to December 5, 1998 and minimum loan  repayments of $50,000
for each of the  months of  September,  October  and  November  1998,  leaving a
balance  at  December  5,  1998 of  approximately  $400,000.  Imatron  agreed to
continue to subordinate its loan to the ProFutures  Loan, and Uro-Tech agreed to
subordinate  its loan to Imatron's  loan.  Except as modified by the amendments,
the remaining agreements remain the same.

         The Company is in negotiations  to sell one of its POSICAM(TM)  systems
to a third party that currently  leases the system.  It is anticipated  that, if
the  Company is  successful  in  consummating  such sale,  it will  receive  net
proceeds of approximately  $360,000.  It is the Company's  intention to use such
proceeds,  plus proceeds from a service contract currently being negotiated with
the third party, to retire the remaining  balance of  approximately  $400,000 on
the ProFutures Loan. There can be no assurances,  however, that the Company will
be successful in reaching an agreement  concerning  the proposed  system sale or
that,  if  agreement  is  reached,  such sale will be  consummated,  or that the
Company  otherwise will be able to obtain  additional  debt or equity  financing
necessary to repay the ProFutures Loan by such maturity date. Absent obtaining a
further  extension of the December 5, 1998 maturity date of the ProFutures Loan,
closing the proposed sale of the  POSICAM(TM)  system,  or obtaining  additional
debt or equity financing  necessary to repay the ProFutures Loan by the maturity
date, the Company may be forced to seek protection under the Federal  Bankruptcy
laws.

         If the proposal to amend the Company's Articles of Incorporation is not
approved by the Company's shareholders,  or if such proposal is approved but the
Imatron  Transaction does not  subsequently  close, the Company may be forced to
seek protection under the Federal Bankruptcy laws. Even if Proposal Two to amend
the Company's Articles of Incorporation is approved and the Imatron  Transaction
closes,  there can be no assurances  that the Company will thereafter be able to
raise sufficient  capital for the Company to continue as a going concern or even
if such  additional  capital is raised  that the Company  will ever  achieve the
level of revenues needed to be profitable in the future, or, if profitability is
achieved, that it will be sustained.

Results of Operations

         1997  Compared to 1996.  During the year ended  December 31, 1997,  the
Company  continued  to  experience  deterioration  in its  financial  condition;
however,  the  Company's  net  loss  decreased  from  ($6,375,000)  in  1996  to
($4,455,000)  in 1997.  The  decrease  in net loss is  primarily  the  result of
significant  staff reductions and efforts to curtail costs,  partially offset by
increases in valuation  reserves to reduce  inventories  to their  estimated net
realizable value.

Further analysis follows:

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<PAGE>
                  Revenues.  System  sales  increased  from  $650,000 in 1996 to
$1,129,000  in 1997,  although the Company sold only one  POSICAM(TM)  system in
each year.  The $479,000  increase is  attributable  to the fact that the system
sold in 1996 was a  refurbished  system and sold for a much lower price than the
new HZ series system sold in 1997. Fee per scan revenues increased from $415,000
in 1996 to  $602,000  in 1997 as a result  of  improved  performance  under  the
Company's only fee per scan contract. Service and component revenue decreased by
$715,000 in 1997 as compared to 1996 due primarily to a $750,000  system upgrade
performed on an older POSICAM(TM) system in 1996.

                  Cost of Sales and  Services.  Cost of system  sales  increased
from  $316,000 in 1996 to $698,000 in 1997 due to the fact that the  POSICAM(TM)
system sold in 1997 was a new system while the  POSICAM(TM)  system sold in 1996
was simply  refurbished  and,  accordingly,  was of lesser cost. Cost of fee per
scan  decreased  from  $172,000  in  1996  to  $156,000  in  1997  due to  lower
maintenance  costs on the Company's  only fee per scan system.  The primary cost
associated with fee per scan is deprecation  expense,  which remained  constant.
Service, warranty and component cost decreased from $610,000 in 1996 to $465,000
in 1997 due to a 31%  decline in service  and  component  revenue.  The  Company
recognized a $1,224,000  provision for inventory  obsolescence during the fourth
quarter of 1997 based upon management's  assessment that improvements would need
to be made  to the  Company's  POSICAM(TM)  systems  in  order  to meet  current
technological  requirements  by potential  costumers.  The provision for loss on
system exchange was a non-recurring  warranty  reserve  established in the first
quarter  of 1996 in  anticipation  of  possible  losses  to be  incurred  on the
exchange of the Company's first  POSICAM(TM) HZL system.  No similar reserve was
needed in 1997.

                  Operating   Expenses.   Research  and   development   expenses
decreased  from  $2,227,000  in 1996 to  $1,305,000 in 1997 due to reductions in
staff. The Company reduced  personnel levels  significantly in 1997 as liquidity
problems  squeezed  Company  resources.   Selling,  general  and  administrative
expenses  declined  from  $5,263,000  in 1996 to  $3,609,000  also  due to staff
reductions.  However, the savings from staff reductions were partially offset by
a provision for bad debts  associated  with  uncollectible  notes  receivable of
$309,000.

                  Other Expenses.  Interest  expense  increased from $197,000 in
1996 to $335,000 in 1997 due primarily to interest  expense  associated with the
ProFutures  Loan. The ProFutures Loan was initially  funded in November 1996 and
had a balance in excess of $1,000,000 throughout much of 1997. The interest rate
on the  ProFutures  Loan increased from 12% to 18% during 1997 and that increase
in  interest  rate  combined  with a higher  average  debt level  resulted  in a
significant increase in interest expense.

                  Net Operating Loss Carry Forwards. The Company has accumulated
a  significant  net  operating  loss carry  forward  which may be used to reduce
taxable  income and related  income taxes in future years.  Since the closing of
the Company's 1993 initial public  offering and the sale in February,  March and
May of 1996 of  3,075,318  shares of  Series A  Preferred  Stock,  each of which
resulted in more than a 50% change in the ownership percentages of shareholders,
the provisions of Section 382 of the Code severely limit the annual  utilization
of the  net  operating  loss  carry  forwards.  If the  Imatron  Transaction  is
completed,  the  utilization  of net  operating  losses  arising  since the 1996
issuance  of  Series  A  Preferred  Stock  will be  limited.  In  addition,  the
utilization  of the losses to reduce future  income taxes is dependent  upon the
generation  of  sufficient  taxable  income prior to the  expiration  of the net
operating  loss carry  forwards.  The carry forwards will begin to expire in the
year 1999.

                  Nine Months Ended  September  30, 1998 Compared to Nine Months
Ended  September 30, 1997.  During the nine months ended September 30, 1998, the
Company  continued  to  experience  deterioration  in its  financial  condition;
however,  the Company's net loss decreased  $1,741,000 from ($2,725,000) for the
nine months ended  September  30, 1997 to  ($984,000)  for the nine months ended
September  30,  1998.  This  decrease  in net loss is  primarily  the  result of
significant staff reductions and efforts to curtail costs.

                                       51
<PAGE>
         The Company  generated  no revenue  from system  sales during the first
nine  months  of 1998 or  1997.  Fee per scan  revenue  increased  $17,000  from
$437,000  during the first nine  months of 1997 to  $454,000  for the first nine
months of 1998 due  primarily  to a greater  number of scans being  performed by
Buffalo Cardiology during the nine months ended September 30, 1998. In addition,
there was a decrease in service and component  sales revenue of $388,000  during
the same period due to less service work performed  during the nine months ended
September 30, 1998.  This reduction in service work is directly  attributable to
staff reductions and normal fluctuations in service.

         Gross  profit  during  the first  nine  months  of 1998 was  $1,012,000
compared to  $1,141,000  for the nine months  ended  September  30,  1997.  This
decrease  in gross  profit of  $129,000 is due  primarily  to lower  service and
component revenue during the nine months ended September 30, 1998.

         Total operating expense decreased approximately  $1,762,000 or 50% from
$3,530,000  for the nine months ended  September 30, 1997 to $1,838,000  for the
nine months ended  September  30,  1998.  The  decrease  primarily  results from
significant staff reductions and related  reductions in research and development
and selling and marketing costs during the nine months ended September 30, 1998.

         Interest  expense  decreased  from  $243,000  for the nine months ended
September 30, 1997 to $228,000 for the nine months ended  September 30, 1998 due
primarily  to  changes  in the  Company's  average  debt level in the first nine
months of 1998 as compared to the first nine months of 1997.

Liquidity and Capital Reserves

         Since its  inception  the Company  has been unable to sell  POSICAM(TM)
systems at quantities sufficient to be profitable. Consequently, the Company has
sustained  substantial  losses.  Net losses for the year ended December 31, 1997
and the nine months  ended  September  30, 1998 were  $4,455,000  and  $984,000,
respectively.  At September 30, 1998, the Company had an accumulated  deficit of
approximately  $49,944,000.  Due to the sizable prices of the Company's  systems
and the  limited  number of  systems  sold or placed in service  each year,  the
Company's revenues have fluctuated significantly year to year.

         At September 30, 1998, the Company had cash and cash equivalents in the
amount of $145,000 compared to $160,000 at December 31, 1997. Throughout much of
1997 and the first nine  months of 1998,  the  Company  has been  unable to meet
certain  of its  obligations  as they  came due.  As a result  of the  Company's
liquidity problem, 1997 salary payments and other benefits to certain management
level  employees  totaling  approximately  $600,000 were unpaid at September 30,
1998.

         The Company's  only current plan with regard to its liquidity  problems
is to attempt to complete the Imatron Transaction discussed in Selected Notes to
the Financial Statements. If the Imatron Transaction is not completed, or if the
Imatron  Transaction is completed and Imatron is  unsuccessful in its efforts to
raise capital for the Company, management believes the Company will be unable to
continue as a going  concern  and the  Company may be forced to seek  protection
under the Federal Bankruptcy laws.

         The  Company  currently  has no shares of Common  Stock  available  for
issuance  and all  authorized  shares have  either  been issued or reserved  for
issuance  in  respect  of  outstanding   options  and  warrants  or  convertible
securities.  The  lack of such  available  shares  significantly  restricts  the
Company's  ability  to raise  additional  capital  through  the  sale of  equity
securities.  The Company believes that its shareholders will approve an increase
in the number of authorized  common shares at its Annual  Meeting;  however,  no
assurance  can be given  that  such  additional  shares  will be  authorized  in
adequate time to allow the Company to issue such equity securities.

Litigation

         The City of Houston  has filed suit,  and  judgment  has been  entered,
against  the  Company  for  delinquent  taxes  in the  amount  of  approximately
$240,000. The balance is fully accrued at September 30, 1998.

         The Company is  obligated to pay  royalties of 3% of the gross  revenue
from sales, uses, leases,  licensing or rentals of POSICAM systems, 1% each to a
director of the Company and two other unrelated entities. During the years ended
December  31,  1997 and 1996 the Company  incurred  royalties  of  $134,000  and
$42,000, respectively, based upon system sales and adjustments to royalties.

                                       52
<PAGE>
         The  Company's  royalties  were  reduced  to the 3%  level  based  upon
consideration,  provided to two of the payees,  under consulting  agreements and
promissory notes. However, the consulting agreements provide that if the Company
defaults  in its  payment  obligations  thereunder,  then  the  payees  would be
entitled to receive regrant of the royalties that they previously  released.  In
April 1998, the Company received a demand letter from one of the payees alleging
default  under his  consulting  agreement  in 1997 and  demanding  regrant of an
additional 1% royalty  interest.  Although the Company has not received a demand
from the second  payee,  the Company  believes  that a payment  default may have
occurred under his consulting  agreement and that as a result thereof, he may be
entitled to the regrant of an  additional  0.5%  royalty  interest.  The Company
anticipates  initiating  settlement  discussions with both payees concerning the
alleged payment  defaults.  The Company is unable to predict the outcome of such
discussions  at this time;  however,  the  Company  recorded  an  adjustment  of
approximately $100,000 during 1997 in recognition of the additional royalties it
may owe. If the parties fail to reach a  settlement,  one payee will be entitled
to receive an  aggregate  2% royalty  and the second  payee will be  entitled to
receive an aggregate  1.5%  royalty,  resulting in an increase of the  Company's
royalty  obligations from 3% to 4.5%. Such increase in royalty obligations could
have a material adverse effect on the Company's future financial performance.

         Arbitration procedures have been initiated against the Company in China
involving a dispute with respect to a POSICAMTM system. The Company entered into
a contract with a Chinese  company in September 1996 to provide the company with
a POSICAMTM system. The Chinese company provided the Company with a down payment
of  approximately  $300,000  and agreed to provide the company  with a letter of
credit  for the  remaining  purchase  price,  which  letter of  credit  would be
fundable upon shipment of the POSICAMTM  system.  The Company  utilized the down
payment  to  purchase  the   beginning   inventory  for  the  system  and  began
construction of the system. The Chinese company,  however, failed to provide the
Company  with the  letter of  credit  and the  Company,  because  of its  severe
financial  difficulties,  was unable to complete and deliver the system  without
such  additional  funds.  The  Chinese  company has  demanded  the return of its
deposit and, on September 8, 1998, a notice of arbitration  concerning the sales
contract dispute was issued to the Company by the China  International  Economic
and Trade Arbitration Commission, Shanghai Commission. The Company believes that
the claims  raised by the  Chinese  company  are  without  merit and  intends to
vigorously defend its interests.  It is not possible at this time to predict the
outcome of this proceeding,  although a ruling  unfavorable to the Company could
have  a  material  adverse  effect  on  the  Company's  business  and  financial
performance.

Impact of Year 2000

         The Year 2000 issue is the result of computer  programs  being  written
using two digits  rather  than four to define the  applicable  year.  Any of the
Company's  computer  programs that have time sensitive  software may recognize a
date using "00" as the year 1900 rather than the year 2000. This could result in
a system failure or miscalculation causing a disruption of business activities.

         The Company has  performed  only a  preliminary  assessment of the Year
2000 issue using a broad overview and management's current  understanding of its
information and  non-information  systems and its informal  understanding of the
information and non-information  systems of its significant  suppliers and major
customers. None of the detailed tasks necessary to properly assess the Year 2000
issue (such as direct  coordination with vendors,  customers and  manufacturers)
have been performed.

         Based on its  preliminary  assessment,  the  Company  believes  that no
significant  modifications to its computer software or hardware will be required
and that its existing  computer systems  (including  information  systems,  non-
information  systems  using  date  sensitive  embedded  chips and its  POSICAMTM
systems)  will  function  properly  with  respect  to dates in the year 2000 and
thereafter.  Based upon such preliminary assessment,  the Company also currently
believes  that costs to modify the  Company's  existing  computer  hardware  and
software  systems  in  regard to the Year 2000  issue  will not be  significant.
However,  the Year 2000 issue is  extremely  complex  and the costs to  properly
assess its impact on the Company and to correct associated  problems may be very
significant.

                                       53
<PAGE>
         Based on the Company's preliminary assessment of its relationships with
significant  suppliers and major customers to understand the extent to which the
Company is  vulnerable  to any failure by third parties to remedy their own Year
2000 issues,  management  believes  that the Company  does not have  significant
exposure  with respect to third  parties.  However,  the  Company's  preliminary
assessments  indicated that the worst case scenario with regard to the Year 2000
issue would be delays in receiving parts and materials needed for  manufacturing
and delays by customers  in making  payments for  fee-per-scan  and  maintenance
services. In the Company's current financial position,  such circumstances could
threaten the Company's continued existence.

         Due to the Company's current severe liquidity problems, the Company has
not had the  financial  resources to perform a complete  assessment of Year 2000
issues or assess the potential cost or develop any contingency  plan with regard
to Year 2000  issues  that may  arise.  The  Company is unable to predict at the
current time,  when and to what extent it may further  pursue its  assessment of
potential  Year 2000  issues and the  development  of any  contingency  plans in
respect thereof. If the Company is able to obtain necessary financial resources,
a complete  assessment of the Year 2000 issues facing the Company will likely be
completed in the first half of 1999.

Recently Issued Accounting Pronouncements

         In June 1997, the Financial  Accounting Standards Board issued SFAS No.
130,  "Reporting  Comprehensive  Income," and SFAS No. 131,  "Disclosures  about
Segments of an Enterprise and Related  Information."  These  pronouncements  are
effective for fiscal years  beginning after December 15, 1997. SFAS 130 requires
a company to display an amount representing  comprehensive income, as defined by
the  statement,   as  part  of  the  Company's   basic   financial   statements.
Comprehensive  income will include items such as  unrealized  gains or losses on
certain  investment  securities and foreign currency items. The adoption of SFAS
130 should not materially affect the Company's financial statements.

         SFAS  131   requires  a  company  to  disclose   financial   and  other
information,  as defined by the statement,  about its business  segments,  their
products and services,  geographic areas,  major customers,  revenues,  profits,
assets and other information.  The Company has not yet assessed what impact SFAS
131 will have on its financial statement reporting.

Information Regarding and Factors Affecting Forward-Looking Statements

         Certain  statements  contained  in this  report on,  including  without
limitation statements containing the words "believes,"  "anticipates," "expects"
and   words  of   similar   import,   are   forward-looking   statements.   Such
forward-looking  statements  involve known and unknown risks,  uncertainties and
other matters which may cause the actual results, performance or achievements of
the  Company or  industry  results to be  materially  different  from any future
results,   performance   or   achievements   expressed   or   implied   by  such
forward-looking statements. Such risks, uncertainties and other matters include,
but are not limited to the factors  described below. In addition,  the Company's
ability to achieve  anticipated results or meet any specific goals or milestones
will be subject to other  factors  affecting  the  Company's  business  that are
beyond the Company's  control,  including,  but not limited to, general economic
conditions,  the effect of government regulation on the conduct of the Company's
business,  insurance  reimbursements  and  changes in  technology.  Given  these
uncertainties,  readers  are  cautioned  not to  place  undue  reliance  on such
forward-looking  statements.  The Company disclaims any obligation to update any
such  statements  or publicly  announce  any updates or  revisions to any of the
forward-looking  statements  contained  herein  to  reflect  any  change  in the
Company's  expectation with regard thereto or any change in events,  conditions,
circumstances or assumptions underlying such statements.

                                       54
<PAGE>
            MARKET FOR COMMON EQUITY AND RELATED SHAREHOLDER MATTERS

         In December 1993, the Company  completed an initial public  offering of
1,750,000  shares  of  Common  Stock  and  1,946,775  redeemable  warrants  (the
"Redeemable  Warrants") to purchase  Common Stock.  Prior to the initial  public
offering,  there was no public market for the Common Stock.  Initially after the
initial public offering, the Common Stock and Redeemable Warrants were quoted on
the Nasdaq  National  Market  under the  symbols  POSI and POSIW,  respectively.
Subsequently, the Common Stock and Redeemable Warrants were quoted on the Nasdaq
SmallCap Market. The standards required for the Company to maintain such listing
include,  among other things, that the Company have total capital and surplus of
at least  $2,000,000.  As of September 30, 1998, the Company had a total capital
and surplus deficit of  $(6,097,000).  The Company failed to maintain its Nasdaq
stock  market  listing  and  will  not meet  the  substantially  more  stringent
requirements  to be re-listed  until such time as it is able to raise capital by
sale of  additional  equity  securities  or increased  sales of its  POSICAM(TM)
systems.  There can be no assurance  that the Company will ever meet the capital
and surplus requirements needed to be re-listed under the Nasdaq SmallCap Market
System.

         Trading  of the  Common  Stock  is  currently  conducted  in the  "pink
sheets"of the NASD's Electronic  Bulletin Board.  Trading in the Common Stock is
covered  by rules  promulgated  under the  Securities  Exchange  Act of 1934 for
non-Nasdaq and non-exchange listed securities.  Under such rules, broker/dealers
who recommend such  securities to persons other than  established  customers and
accredited  investors must make a special written suitability  determination for
the purchaser  and receive the  purchaser's  written  agreement to a transaction
prior to sale.  Securities are exempt from these rules if the market price is at
least $5.00 per share. As of September 30, 1998, the closing price of the Common
Stock was $0.15.

         The following sets forth the range of the high and low reported closing
sales prices of the Common Stock for the four  quarters of 1997 and 1996 and the
four quarters of 1998 (through  October 30, 1998), all as reported on the Nasdaq
National Market or Nasdaq SmallCap Market as appropriate.

                           1998                 1997                  1996
                     ---------------      ---------------       ---------------
                      High      Low        High      Low         High      Low
                     ------   ------      ------   ------       ------   ------
First Quarter        $0.625   $0.266      $3.375   $1.250       $3.563   $1.375
Second Quarter        0.609    0.188       1.938    0.375        4.188    3.250
Third Quarter         0.453    0.213       1.438    0.422        5.500    2.000
Fourth Quarter        0.328    0.047       0.953    0.172        3.250    1.500

         There  were  approximately  220  holders  of record of shares of Common
Stock as of  October  30,  1998.  The  Company  estimated  that  there were also
approximately 800 beneficial holders of Common Stock as of October 30, 1998.

         The  Company has never paid cash  dividends  on its Common  Stock.  The
Company  does  not  intend  to pay cash  dividends  on its  Common  Stock in the
foreseeable future.

                                       55
<PAGE>
                 PRINCIPAL SHAREHOLDERS AND MANAGEMENT OWNERSHIP

         The following table sets forth certain  information as of September 30,
1998,  regarding  the ownership of Common Stock of: (i) each person who is known
by the  Company to be the  beneficial  owner of more than 5% of the  outstanding
shares of Common Stock; (ii) each director and executive officer of the Company;
and (iv)  all  executive  officers  and  directors  of the  Company  as a group.
Included  in  the  "Number  of  Shares  of  Common   Stock"  column  are  shares
attributable  to  options or  warrants  that are  exercisable  as of, or will be
exercisable within 60 days after, September 30, 1998.

<TABLE>
<CAPTION>


                                                                    Number of     Percent of      Number of        Percent of
                                    Number of       Percent of      Shares of    Outstanding      Shares of       Outstanding
                                     Shares        Outstanding      Series A       Series A       Series B          Series B
     Name of Beneficial            of Common         Common         Preferred     Preferred       Preferred        Preferred
          Owner(1)                   Stock            Stock           Stock          Stock         Stock             Stock
- -----------------------------     -----------      -----------      ---------    ------------    -----------      -----------
<S>                                   <C>                <C>         <C>                <C>           <C>                <C>
Auer & Co.(2)                         600,000            11.3%       400,000            25.1%
c/o ASB Capital Mgt.
1101 Pennsylvania Avenue NW,
Suite 300
Washington, DC 20004

DHB Capital                            11,568               *                                         25,000             100%
11 Old Westbury Rd.
Old Westbury, New York  11568

Uro-Tech, Ltd.(3)                     865,523            15.5%       433,329            27.2%
5430 LBJ Freeway
Dallas, Texas  75240

K. Lance Gould, M.D.(4)               103,830             2.1%
Positron Corporation
16350 Park Ten Place
Houston, Texas 77084

Gary B. Wood, Ph.D.(5)                 80,793             1.6%
OmniMed  Corporation
5430 LBJ Freeway
Dallas, Texas  75240

John H. Laragh, M.D.(6)                31,709               *
Positron Corporation
1304 Langham Creek Drive
Suite 310
Houston, Texas 77084

Ronald B. Schilling, Ph.D.(7)           8,709               *
Positron Corporation
16350 Park Ten Place
Houston, Texas 77084

All Directors and Executive           225,041             4.4%       433,329            27.2%
Officers as a Group
(4 persons)
<FN>
*        Less than 1%

(1)      Except as otherwise indicated, each shareholder has sole investment and
         sole voting  power with respect to the shares of Common Stock or Series
         A Preferred Stock shown.

(2)      Includes 600,000 shares of Common Stock issuable upon the conversion of
         400,000  shares of Series A  Preferred  Stock and  200,000  warrants to
         purchase Common Stock.

(3)      Includes  424,787  shares of Common  Stock owned by  Uro-Tech,  Ltd., a
         Texas  limited  partnership,  the  general  partner of which is OmniMed
         Corporation  ("OmniMed").  Includes  156,565  shares  of  Common  Stock
         issuable upon the exercise of Series E Warrants held by Uro-Tech,  Ltd.
         Includes 650,000 shares of Common Stock issuable upon the conversion of
         433,329  shares of Series A  Preferred  Stock and  216,671  warrants to
         purchase

                                       56
<PAGE>
         Common Stock acquired upon the conversion  $650,000 in principal amount
         of the Uro-Tech Loan (as defined  herein).  Also includes 67,500 shares
         issuable upon the  conversion of warrants  acquired in connection  with
         the Uro-Tech Loan. Dr. Wood is Chairman of the Board of Directors,  and
         beneficially  owns  63.7%  of the  outstanding  voting  securities,  of
         OmniMed. All shares beneficially owned by OmniMed have been included in
         the total  number of shares of Common Stock  beneficially  owned by Dr.
         Wood.

(4)      Includes  9,936  shares of Common  Stock  issuable  upon  exercise of a
         warrant held by Dr. Gould,  and 11,709 shares of Common Stock  issuable
         upon exercise of an option awarded to Dr. Gould under the 1994 Plan and
         250,000  shares of Common  Stock  issuable  upon  exercise of an option
         awarded to Dr. Gould for services  rendered by Dr. Gould in  connection
         with the sale of a POSICAMTM system.

(5)      Includes  7,304  shares of Common  Stock  issuable  upon  exercise of a
         warrant  held by Dr. Wood and 50,000  shares of Common  Stock  issuable
         upon  exercise  of an option  granted  to Mr.  Wood on March 24,  1995.
         Includes  7,000 shares of Common Stock issuable upon the exercise of an
         option  granted  to Dr.  Wood in June 1994 and  1,209  shares of Common
         Stock  issuable up to exercise of an option granted to Dr. Wood in June
         1995.  Includes  15,280  shares of Common Stock  beneficially  owned by
         OmniMed.  Dr. Wood owns 63.7% of the outstanding  voting  securities of
         OmniMed.

(6)      Includes  11,709  shares of Common  Stock  issuable  upon  exercise  of
         options  awarded to Dr. Laragh under the 1994 Plan and 20,000 shares of
         Common Stock  issuable upon exercise of an option awarded to Dr. Laragh
         on March 24, 1995.

(7)      Includes 8,709 shares of Common Stock issuable upon exercise of options
         award to Mr. Schilling under the 1994 Plan.
</FN>
</TABLE>
                                       57
<PAGE>
                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

Royalty Payments
         In 1984, the Company licensed for use in the United States the know-how
and patent  rights  relating to positron  imaging  (the  "Licensed  Technology")
possessed by the Clayton  Foundation,  K. Lance Gould (a current director of the
Company) and Nizar A. Mullani (a former director of the Company). The Company is
currently  obligated to pay  royalties of 3% of the gross  revenues  from sales,
uses, leases,  licensing or rentals of the Licensed Technologies,  consisting of
1% to each of the Clayton Foundation,  K. Lance Gould and Nizar A. Mullani.  The
Company has not made any royalty  payments  since 1993.  As of October 30, 1998,
approximately  $225,000 was owed to the aforementioned  individuals for past due
royalties.

Conversion of Debt
         On January 15, 1993, the Company and Dr. K. Lance Gould entered into an
agreement (the "Gould Agreement") pursuant to which (i) Dr. Gould exchanged a 9%
Convertible Promissory Note in the principal amount of $281,250 issued to him on
December  22, 1988 for a new 9%  Convertible  Promissory  Note in the  principal
amount of  $281,250,  (ii) in exchange  for past due  royalties in the amount of
$36,951 and accrued  interest in the amount of $101,643,  the Company issued Dr.
Gould a  second  9%  Convertible  Promissory  Note in the  principal  amount  of
$138,594  with an  original  maturity  date  of  October  31,  1993  (which  was
subsequently  extended to December 15,  1993),  (iii) the Company  issued to Dr.
Gould a warrant expiring July 25, 1996, to purchase 9,936 shares of Common Stock
at an exercise price of $25.59 per share, and (iv) the Company agreed to pay Dr.
Gould's legal fees in the amount of $15,125 in connection  with the  negotiation
of the  Gould  Agreement.  Pursuant  to the  conversion  features  of  these  9%
Convertible  Promissory  Notes, upon the closing of the Company's initial public
offering,  the 9% Convertible  Promissory  Notes converted into 50,889 shares of
Common Stock.
         In November 1993, the Company  entered into an agreement with Dr. Gould
under which the Company  became  obligated to extend loans to Dr. Gould in order
to provide him with funds to satisfy his personal  income tax liability  arising
out of the conversion of his 9% Convertible  Promissory Notes into Common Stock.
Such  agreement  was  entered  into by the Company in  consideration  of certain
concessions  made by Dr.  Gould  concerning  the  conversion  terms under his 9%
Convertible  Promissory Notes. Pursuant to the agreement,  the loans would be on
substantially the following terms if made: (i) limited to a principal amount not
to exceed $175,000,  (ii) interest payable at the rate of 6% per annum, (iii) an
initial term of three years, (iv) limited recourse against the borrower, and (v)
collateralized  by Common Stock owned by the borrower.  In accordance  with such
agreement, on April 15, 1994, the Company extended a $165,817 loan to Dr. Gould.
The current outstanding balance is $165,817.  In April 1997, the Company and Dr.
Gould agreed to a one-year extension of his loan.

Consultants
         The Company  and Dr.  Wood have  entered  into a  Consulting  Agreement
whereby  Dr.  Wood  provides  certain  managerial,   financial,   marketing  and
organizational   services  to  the  Company.   The  Company   incurred  fees  of
approximately  $80,000 in both 1997 and 1996. In January  1995,  the Company and
Dr. Wood agreed to extend the term of such consulting  agreement to December 31,
1998.
         The Company  entered  into a  Consulting  Agreement  with Dr.  Gould in
August 1984. On January 15, 1993, pursuant to the Agreement, the Company and Dr.
Gould entered into a new consulting agreement (the "Gould Consulting Agreement")
effective upon the closing of the Company's  initial public offering.  The Gould
Consulting Agreement provided for a term of ten years (which term was reduced by
agreement  in May 1993 to three  years) and  provides for the Company to pay him
consulting  fees at an annual  rate of  $80,000,  payable  monthly,  subject  to
adjustment  based upon changes in the consumer  price  index.  In addition,  the
Company  reimburses Dr. Gould for approved  expenses in connection with rendered
services. In the event that the Company fails to make payments to Dr. Gould when
due under the Gould  Consulting  Agreement or fails to make any required royalty
payments to Dr. Gould,  the Company may be required,  at Dr.  Gould's  option to
convey to Dr. Gould a 0.5% royalty on sales of POSICAMTM systems.

Uro-Tech Loan
         During the last quarter of 1995 and the first quarter of 1996, in order
to fund its activities the Company borrowed a total of $1,313,000 from Uro-Tech,
Ltd. , (the "UroTech  Loan").  The Uro-Tech Loan, as amended,  bears interest at
13.8% per annum and matures on December  31,  1997,  and is secured by liens and
security  interests  encumbering  most of the  Company's  assets  including  the
Company's  know-how,  patents  and  proprietary  rights  pertaining  to its  PET
technology.  In  connection  with the loan from  Uro-Tech,  the Company  granted
Uro-Tech  warrants to purchase  67,500  shares of Common  Stock,  at an exercise
price of $2.00 per share exercisable through February 7, 2001.

                                       58
<PAGE>
             SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

         Section  16(a) of the  Securities  Exchange  Act of 1934  requires  the
Company's  executive  officers,  directors and persons who beneficially own more
than 10% of a registered class of the Company's  equity  securities to file with
the Securities and Exchange  Commission initial reports of ownership and reports
of changes in  ownership  of Common  Stock and other  equity  securities  of the
Company.  Based on the  Company's  review of forms  furnished to the Company and
representations  from reporting  persons,  the Company  believes that all filing
requirements  applicable to the Company's executive officers,  directors and 10%
beneficial owners were complied with during 1997.

                              SHAREHOLDER PROPOSALS

         Any  shareholder  of the  Company  desiring  to present a proposal  for
action at the Annual Meeting of Shareholders to be held in 1999 must deliver the
proposal to the  executive  offices of the Company by no later than December 11,
1998,  unless the Company  notifies the  shareholders  otherwise.  The Company's
management will have  discretionary  authority with respect to proxies submitted
to the 1999 Annual Meeting of  Shareholders on any matter which the Company does
not receive notice of by February 25, 1999.

                          ANNUAL REPORT ON FORM 10-KSB

         A copy of the Company's Annual Report on Form 10-KSB for the year ended
December 31, 1997,  as filed with the  Securities  and Exchange  Commission,  is
enclosed  herewith as a part of the enclosed Annual Report to  Shareholders.  An
additional  copy  of the  Annual  Report  on  Form  10-KSB  will  be sent to any
shareholder  without  charge upon  written  request  made to the Company at 1304
Langham  Creek Drive,  Suite 310,  Houston,  Texas 77084,  Attention:  Corporate
Communications.

                                  OTHER MATTERS

         The Board of  Directors  does not  intend  to bring  any other  matters
before the Annual Meeting and does not know of any matters which will be brought
before the Annual Meeting by others. However, if any other matters properly come
before the Annual  Meeting,  it is the  intention  of the  persons  named in the
accompanying  proxy to vote such proxy in accordance with their judgment on such
matters.

                                              By Order of the Board of Directors

                                              Gary B. Wood
                                              Secretary

Houston, Texas
November 20, 1998

                                       59
<PAGE>
                              POSITRON CORPORATION

                    PROXY SOLICITED BY THE BOARD OF DIRECTORS
         FOR ANNUAL MEETING OF SHAREHOLDERS TO BE HELD DECEMBER 18, 1998

         The undersigned hereby (i) acknowledges receipt of the Notice of Annual
Meeting of  Shareholders of Positron  Corporation  (the "Company") to be held on
December 18, 1998, and the Proxy Statement in connection  therewith,  each dated
as of  November 20, 1998,  and (ii)  constitutes  and appoints  Gary B. Wood his
attorney and proxy,  with full power of substitution to him, to vote, and to act
with  respect  to, all  shares of Common  Stock,  par value $.01 per share,  and
Series A 8% Cumulative  Convertible  Redeemable  Preferred  Stock of the Company
standing in the name of the undersigned or with respect to which the undersigned
is entitled to vote and act at the annual  meeting,  as indicated on the reverse
side of this card:



                                   Dated this ______ day of ______________, 1998



                                   Signature(s) of shareholder(s)


                                   Please sign  exactly as your name  appears on
                                   your  stock  certificate.   When  signing  on
                                   behalf of a corporation, partnership, estate,
                                   trust  or in other  representative  capacity,
                                   please  sign your full  name and  title.  For
                                   joint accounts, each joint owner must sign.




                 PLEASE DATE, SIGN AND MAIL YOUR PROXY PROMPTLY.
<PAGE>

  1.       ELECTION OF DIRECTOR:

                                                 WITHHOLD AUTHORITY to vote
           FOR nominee listed below   |_|        for nominee listed below   |_|

                                  Gary B. Wood

  2.       PROPOSAL TO AMEND ARTICLES OF INCORPORATION:

                   FOR   |_|        AGAINST   |_|        ABSTAIN   |_|

  3.       APPROVAL OF DESIGNATION OF HAM, LANGSTON & BREZINA, L.L.P., as
           independent  auditors  for the fiscal year ended  December 31,
           1997:

                   FOR   |_|        AGAINST   |_|        ABSTAIN   |_|

  4.       IN THE  DISCRETION  of the proxies on any other matters as may
           properly  come  before  the  meeting  or  any   Adjournment(s)
           thereof.

         THIS  PROXY  WILL  BE  VOTED  AS  SPECIFIED   ABOVE.   IF  NO  CONTRARY
SPECIFICATION  IS MADE, THIS PROXY WILL BE VOTED "FOR" EACH OF THE PROPOSALS SET
FORTH ABOVE. IN ORDER FOR THIS CARD TO BE VALID IT MUST BE SIGNED ON THE REVERSE
SIDE OF THIS CARD.

          If you plan to attend the annual meeting, check this box: |_|
<PAGE>
                                     ANNEX A

                            STOCK PURCHASE AGREEMENT

         This Stock  Purchase  Agreement  ("Agreement")  is made this 1st day of
May,  1998  by and  between  POSITRON  CORPORATION,  a  Texas  corporation  with
principal  offices  located at 1304 Langham  Creek Drive,  Houston,  Texas 77084
("SELLER") and IMATRON INC., a New Jersey  corporation  with  principal  offices
located at 389 Oyster Point Blvd., So. San Francisco, CA 94080 ("BUYER").

         WHEREAS, Seller wishes to issue and sell to Buyer certain shares of its
common stock ("Shares") in exchange for certain consideration; and

         WHEREAS,  Buyer wishes to purchase such certain  shares of common stock
issued by and from Seller pursuant to certain terms and conditions.

         NOW,   THEREFORE,   in   consideration  of  the  mutual  covenants  and
agreements, the Seller and Buyer hereby agree as follows:

                                    AGREEMENT

     1. Sale and Purchase of Shares. On the closing date as set forth in Section
3 ("Closing  Date"),  Seller shall deliver to Buyer, for the  consideration  set
forth in Section 2 hereof,  the greater of Nine  Million  (9,000,000)  shares of
Seller's common stock or whatever number of common shares in excess of 9,000,000
common shares constitutes fifty-one percent (51%) of Seller's outstanding voting
securities on a fully  diluted  basis,  exclusive of out of the money  warrants,
and/or  options,  and/or  convertible  securities,  calculated as of the Closing
Date.  For this purpose,  "out of the money" shall mean warrants  and/or options
and /or  convertible  securities in which the purchase  price of the  underlying
common  stock  for which the  warrant  or the  option  may be  exercised  or the
security  converted exceeds the fair market value of the underlying common stock
by more than 10%, as  determined  by  averaging  the bid and asked prices of the
common  stock during the last ten (10)  trading  days  immediately  prior to the
Closing Date.

     2.  Consideration.  In  consideration  of the purchase of the Shares on the
Closing Date, Buyer hereby agrees to pay the following consideration:

       i.  The affirmative covenants of Buyer as described in Section 10 herein.

       ii. Payment of One Hundred U.S. Dollars ($100.00), payable at Closing.

     3.  Closing.  The  closing of the sale to, and  purchase  by,  Buyer of the
Shares  shall take place at the  offices  of Imatron  Inc.  at the hour of 10:00
a.m., on the first business day after all conditions  precedent  shall have been
met or waived, or on such other day or at such other time or place as the Seller
and Buyer shall agree.

     At the Closing, Seller will deliver to Buyer certificates  representing the
Shares being purchased by Buyer, registered in its name.

     4. Restriction on Transfer of Securities.

       a. Restrictions. The Shares are transferable only pursuant to i. a public
offering   registered  under  the  Securities  Act  of  1933,  as  amended  (the
"Securities  Act"),  ii. Rule 144 (or any similar  rule then in effect)  adopted
under the  Securities  Act, if such rule is available,  and iii.  subject to the
conditions  elsewhere  specified in this Section 4, any other legally  available
means of transfer.

                                       A-1
<PAGE>
       b.  Each  certificate  representing  Shares  will be  endorsed  with  the
following legend:

         i. Legend.

         "The securities evidenced hereby may not be transferred without (i) the
         opinion of counsel  satisfactory  to the Company that such transfer may
         be lawfully made without  registration under the Securities Act of 1933
         and all applicable state securities laws or (ii) such registration."

         ii. Stop Transfer Order. A stop transfer order shall be placed with the
         Seller's  transfer agent  preventing  transfer of any of the securities
         referred  to  in  paragraph  (a)  above  pending  compliance  with  the
         conditions set forth in any such legend.

       c. Removal of Legend.  Any legend endorsed on a certificate or instrument
evidencing  a security  pursuant  to Section 4.2 hereof  shall be  removed,  and
Seller shall issue a certificate or instrument without such legend to the holder
of such  security,  i. in accordance  with Section  4.2(a)  hereof,  ii. if such
security is being disposed of pursuant to registration  under the Securities Act
and any  applicable  state acts or pursuant to Rule 144 or any similar rule then
in effect,  or iii.  if such holder  provides  Seller with an opinion of counsel
satisfactory  to it to the  effect  that a sale,  transfer,  assignment,  offer,
pledge  or  distribution  for  value  of  such  security  may  be  made  without
registration  and that such legend is not  required  to satisfy  the  applicable
exemption from registration.

     5.  Representations  and  Warranties  by Seller.  Except as  disclosed  and
described in Schedule 5 hereto, Seller represents and warrants to Buyer that:

       a. Organization, Standing, Power. Seller is a corporation duly organized,
validly  existing and in good standing under the laws of the State of Texas, and
has the requisite  corporate  power and authority to own its  properties  and to
carry on its  business in all  material  respects as it is now being  conducted.
Seller has, or at the Closing Date will have, the requisite  corporate power and
authority to issue the Common Shares,  and to otherwise  perform its obligations
under this Agreement.  The copies of the Articles of Incorporation and Bylaws of
the Company  delivered  to Buyer or its agents  prior to the  execution  of this
Agreement are true and complete copies of the duly and legally adopted  Articles
of  Incorporation  and  Bylaws  of  Seller  in  effect  as of the  date  of this
Agreement.

       b.  Qualification.  Seller is duly  qualified  or  licensed  as a foreign
corporation  in good  standing  in each  jurisdiction  wherein the nature of its
activities  or of its  properties  owned or leased makes such  qualification  or
licensing  necessary  and failure to be so  qualified  or licensed  would have a
material adverse impact on its business.

       c. Financial  Statements.  Attached hereto as Exhibit A are: i. a balance
sheet at September 30, 1997,  together with the related statements of operations
and cash flow, and changes to  shareholders'  equity for the 9 month period then
ended,  and ii.a draft of a balance  sheet at December  31,  1997 (the  "Balance
Sheet Date"),  and the related  statements  of operations  and cash flow for the
quarter then ended,  prepared by Seller. Such financial  statements (1) are true
and correct and in accordance with the books and records of Seller,  (2) present
fairly the  financial  condition  of Seller at the  balance  sheet dates and the
results of its operations for the periods  therein  specified,  and (3) have, in
all material  respects,  been prepared in  accordance  with  generally  accepted
accounting  principles  applied  on a basis  consistent  with  prior  accounting
periods,  except  that  the  balance  sheet at  December  31,  1997 and  related
statements  of  operations  and cash flow is in draft form and does not  contain
footnotes.  Specifically,  but not by way of  limitation,  the balance sheets or
notes thereto  disclose all of the debts,  liabilities  and  obligations  of any
nature  (whether  absolute,  accrued or contingent  and whether due or to become
due) of Seller  at  December  31,  1997 and at the  Balance  Sheet  Date  which,
individually  or in the  aggregate,  are material and which in  accordance  with
generally  accepted  accounting  principles would be required to be disclosed in
such balance sheets,  and the omission of which would, in the aggregate,  have a
material  adverse  impact on Seller.  The  balance  sheets  include  appropriate
reserves  for all taxes and other  liabilities  accrued at such date but not yet
payable.

                                       A-2
<PAGE>
       d. Tax Returns and Audits.  Except as disclosed and described on Schedule
5.4 hereto,  all required  federal,  state and local tax returns or  appropriate
extension  requests of Seller have been filed, and all federal,  state and local
taxes  required to be paid with  respect to such  returns  have been paid or due
provision  for the  payment  thereof  has been  made.  Except as  disclosed  and
described on Schedule 5.4,  Seller is not  delinquent in the payment of any such
tax or in the payment of any assessment or governmental  charge,  Seller has not
received  notice of any tax  deficiency  proposed  or  assessed  against it, and
Seller  has not  executed  any  waiver  of any  statute  of  limitations  on the
assessment  or  collection  of any tax.  None of  Seller's  tax returns has been
audited by  governmental  authorities  in a manner to bring  such  audits to the
Seller's  attention.  Seller  does  not have any tax  liabilities  except  those
reflected  in Schedule 5.4 hereto and those  incurred in the ordinary  course of
business since the Balance Sheet Date.

       e.  Litigation;   Governmental  Proceedings.   Except  as  disclosed  and
described  on  Schedule  5.5  hereto:   there  are  no  legal  actions,   suits,
arbitrations  or other legal,  administrative  or  governmental  proceedings  or
investigations  pending  or, to the  knowledge  of  Seller,  threatened  against
Seller,  its  properties,  assets or business;  Seller is not aware of any facts
which are  likely to  result in or form the basis for any such  action,  suit or
other proceeding;  Seller is not in default with respect to any judgment,  order
or decree of any court or any governmental agency or instrumentality; Seller has
not been threatened  with any action or proceeding  under any business or zoning
ordinance, law or regulation.

       f. Compliance with  Applicable Laws and Other  Instruments.  The business
and  operations of Seller have been and are being  conducted in accordance  with
all applicable  laws,  rules and  regulations of all  governmental  authorities.
Subject to  shareholder  approval of  appropriate  amendments to the Articles of
Incorporation  as  contemplated  by this  Agreement,  and except with respect to
existing  registration rights of holders of certain securities issued by Seller,
as disclosed and  described on Schedule 5.6,  neither the execution nor delivery
of,  nor  the  performance  of  or  compliance  with,  this  Agreement  nor  the
consummation  of the  transactions  contemplated  hereby will conflict with, or,
with or without  the  giving of notice or passage of time,  result in any breach
of, or constitute a default  under,  or result in the  imposition of any lien or
encumbrance  upon any asset or property of Seller  pursuant  to, any  applicable
law,  administrative  regulation  or  judgment,  order or decree of any court or
governmental  body, any agreement or other instrument to which Seller is a party
or by which it or any of its properties,  assets or rights is bound or affected,
and will not violate the Articles of Incorporation  or Bylaws of Seller.  Seller
is not in violation of its Articles of Incorporation or its Bylaws.

       g. Common Shares. The Common Shares, when issued and paid for pursuant to
the  terms  of this  Agreement,  will be duly  authorized,  validly  issued  and
outstanding, fully paid, nonassessable and free and clear of all pledges, liens,
encumbrances and restrictions.  The Common Shares,  when issued, will contain no
undisclosed  interest,  present or  future,  and  Seller  does not know,  and at
Closing will not know, of any  assertion of such an interest.  The Common Shares
will be genuine,  and Seller has no knowledge of any fact which would impair the
validity thereof.

       h. Capital Stock. The currently  authorized capital stock of Seller is as
follows:

        SECURITY      AUTHORIZED    ISSUED    COMMON SHARE EQUIVALENT   RESERVED
Common                15,000,000   5,128,990        5,128,990
Series A Preferred     5,450,000   1,595,005        1,614,705
Series B Preferred        35,000      25,000          632,721

         All of the outstanding shares of capital stock of Seller have been duly
authorized  and validly issued and are fully paid and  nonassessable.  Except as
disclosed and  described in Schedule 5.8,  neither the offer nor the issuance or
sale of the Common  Shares as  contemplated  by this  Agreement  constitutes  an
event,  under any anti-dilution  provisions of any securities issued or issuable
by Seller or any  agreements  with  respect to the  issuance  of  securities  by
Seller,  which will either  increase the number of shares  issuable  pursuant to
such provisions or decrease the consideration per share to be received by Seller
pursuant to such  provisions.  All  outstanding  securities  of Seller have been
issued in full compliance with an exemption or exemptions from the  registration
and  prospectus  delivery  requirements  of the  Securities  Act  and  from  the
registration and  qualification  requirements of all applicable state securities
laws. Seller is not a party or subject to any agreement or understanding, and to
Seller's knowledge,  there is no agreement or understanding  between any persons
or entities or by a director of Seller,  which  affects or relates to the voting
or giving of written consents with respect to any security of Seller.

                                       A-3
<PAGE>
       i. Warrants,  Options,  Exchange Rights and Conversion Rights.  Except as
otherwise  disclosed and described in Schedule 5.9 hereto or as  contemplated by
this  Agreement,  there are no  outstanding  or  authorized  options,  warrants,
purchase rights,  subscription rights, calls, contracts,  demands,  commitments,
Convertible   Securities  (as  hereinafter   defined)  or  other  agreements  or
arrangements of any character or nature  whatever,  under which Seller is or may
be obligated to issue capital stock or other securities of any kind representing
an ownership  interest or  contingent  ownership  interest in Seller.  Except as
otherwise  disclosed and described in Schedule 5.9 hereto or as  contemplated by
this  Agreement,  there are no voting trusts,  proxies,  or other  agreements or
understandings with respect to the voting of the capital stock of Seller.

       j. No Brokers or  Finders.  No person,  firm or  corporation  has or will
have, as a result of any act or omission of Seller, any right, interest or valid
claim  against  or upon the  Seller  or Buyer for any  commission,  fee or other
compensation as a finder or broker,  or in any similar  capacity,  in connection
with the transactions contemplated by this Agreement.  Seller will indemnify and
hold Buyer  harmless  against  any and all  liability  with  respect to any such
commission,  fee or other  compensation which may be payable or determined to be
payable in connection with the transactions contemplated by this Agreement.

       k. Composition of the Board of Directors. As of the Execution
Date,  the  complete  Board of Directors  of Seller  consists of those  persons,
including vacant positions, as set forth on Schedule 5.11.

     6.  Representations  and Warranties of Buyer. Buyer represents and warrants
that:

       a.  Investment  Intent.  The Common Shares being  acquired  hereunder are
being  purchased for Buyer's own account and not with the view to, or for resale
in connection  with,  any  distribution  or public  offering  thereof within the
meaning of the Securities Act. Buyer understands that the Common Shares have not
been registered  under the Securities Act or any applicable state laws by reason
of their  issuance or  contemplated  issuance in a  transaction  exempt from the
registration and prospectus delivery requirements of the Securities Act and such
laws,  and that the  reliance  of  Seller  and  others  upon this  exemption  is
predicated  in  part  upon  this  representation  and  warranty.  Buyer  further
understands  that the Common Shares may not be  transferred or resold without i.
registration  under the Securities Act and any applicable state securities laws,
or ii. an exemption from the  requirements  of the Securities Act and applicable
state securities laws.

       b. Accredited  Investor.  The state in which Buyer's  principal office is
located is set forth in Buyer's  address as set forth in this  Agreement.  Buyer
qualifies  as an  accredited  investor  within the meaning of Rule 501 under the
Securities  Act.  Buyer has such  knowledge  and  experience  in  financial  and
business matters that Buyer is capable of evaluating the merits and risks of the
investment to be made hereunder by Buyer.

       c. Acts and  Proceedings.  This Agreement has been duly authorized by all
necessary  action on the part of Buyer,  has been duly executed and delivered by
Buyer, and is a valid and binding agreement upon the part of Buyer.

       d. No Brokers or  Finders.  No person,  firm or  corporation  has or will
have, as a result of any act or omission by Buyer, any right,  interest or valid
claim against Seller for any commission,  fee or other  compensation as a finder
or broker,  or in any similar  capacity,  in  connection  with the  transactions
contemplated  by this  Agreement.  Buyer will indemnify and hold Seller harmless
against any and all liability with respect to any such commission,  fee or other
compensation which may be payable or determined to be payable as a result of the
actions  of  Buyer in  connection  with the  transactions  contemplated  by this
Agreement.

     7. Conditions of Buyer's Obligation. Buyer's obligation to purchase and pay
for the Common Shares on the Closing Date is subject to the fulfillment prior to
or on the Closing Date of the conditions set forth below.  In the event that any
such condition is not satisfied to Buyer's satisfaction, then Buyer shall not be
obligated to proceed with the purchase of such Common Shares nor otherwise  with
any further of its obligations pursuant to this Agreement.


                                       A-4
<PAGE>
       a. No Errors.  etc. The  representations  and  warranties of Seller under
this  Agreement  shall be true in all  material  respects as of the Closing Date
with the same effect as though made on and as of the Closing Date. b. Compliance
with  Agreement.  Seller  shall have  performed  and  complied  in all  material
respects  with all  agreements or  conditions  required by this  Agreement to be
performed and complied with by it prior to or as of the Closing Date.

       c.   Qualification   Under  State  Securities  Laws.  All  registrations,
qualifications, permits and approvals required under applicable state securities
laws for the lawful  execution  and  delivery of this  Agreement  and the offer,
sale, issuance and delivery of the Common Shares shall have been obtained.

       d.  Proceedings  and Documents.  All corporate and other  proceedings and
actions taken in connection with the  transactions  contemplated  hereby and all
certificates,  opinions, agreements,  instruments and documents mentioned herein
or incident to any such transaction  shall be satisfactory in form and substance
to Buyer and its counsel.

       e.  Resignation of Officers and Appointment of Chief  Executive  Officer.
Seller will obtain and deliver to Buyer the resignations of each of the officers
of Seller,  including but not limited to its chief executive officer,  effective
as of the Closing Date, and simultaneously therewith shall cause the appointment
of a chief executive officer and such other officers as are designated by Buyer.
Seller acknowledges that the officers' resignations pursuant to this Section 7.5
will not constitute  resignation by any such employee from employment by Seller,
unless specifically so indicated,  and further that such resignation pursuant to
this Section 7.5 will not be deemed a breach of any employment  agreement  which
might be in effect between Seller and such employee. Seller further acknowledges
that delivery and acceptance of such  resignation  does not otherwise modify the
terms of any employment  agreement which may be in effect, nor is it intended to
effect Seller's ability to negotiate  mutually  acceptable  changes in future to
any employment agreement which may be currently in effect.

       f. Special  Shareholders'  Meeting.  Promptly following execution of this
Agreement,  Seller shall take, with the assistance of Buyer as set forth in this
Agreement, all such actions as may be necessary and shall cause the convening of
a Special  Meeting of Shareholders as promptly as possible to amend the Articles
of Incorporation to authorize an increase in its authorized common stock in such
an amount as to fully  effectuate the provisions of this Agreement,  taking into
account such obligations as Seller may currently have or may be expected to have
in the  foreseeable  future in light of its business  plan. It is the reasonable
expectation  of the parties that the  appropriate  number of  authorized  shares
resulting from such amendment will be not less than 100,000,000 common shares.

       g. Board Resignations.

                           i.  Upon   request  of  Buyer  at  any  time  between
         execution of this  Agreement and the Closing Date, to be effective upon
         the  Closing  Date,  Seller  will  obtain  and  deliver  to  Buyer  the
         resignations  of at least  three of the four  members  of its  Board of
         Directors, as reflected on Schedule 5.11 to this Agreement.

                           ii.  Immediately  upon  Closing,  Seller will cause a
         sufficient  number  of  directors'  resignations  to be  effective  and
         thereupon  will cause the  nominees of Buyer to be elected as directors
         of Seller  in place of the  resigned  directors  or  otherwise  to fill
         vacancies on the Board, so that, following such action, the nominees of
         Buyer will  constitute  a majority  of the members of the Board then in
         office.

     8.  Conditions  of Seller's  Obligation.  Seller's  obligation  to sell the
Common Shares to Buyer on the Closing Date is subject to the  fulfillment  prior
to or on the Closing Date of the conditions  set forth below.  In the event that
any such  condition is not  satisfied,  Seller shall not be obligated to proceed
with the sale of such Common Shares.

                                       A-5
<PAGE>
       a. Shareholder  Authorization.  The shareholders shall have authorized an
increase in the number of authorized  shares of common stock sufficient to fully
effectuate the purposes of this Agreement.

       b. No Errors, etc. The representations and warranties of Buyer under this
Agreement shall be true in all material respects as of the Closing Date with the
same effect as though made on and as of the Closing Date.

       c.  Compliance with  Conditions.  Buyer shall have performed and complied
with all agreements or conditions required by this Agreement to be performed and
complied with by it prior to or as of the Closing Date.

     9. Seller Affirmative Covenants. Seller covenants and agrees that:

       a. Corporate  Existence.  Seller will maintain and cause each  Subsidiary
(as  hereinafter  defined) to maintain its corporate  existence in good standing
and comply with all applicable  laws and  regulations of the United States or of
any state or states thereof or of any political  subdivision  thereof and of any
governmental  authority where failure to so comply would have a material adverse
impact on Seller or its business or operations.

       b. Books of Account and Reserves. Seller will, and will cause each of its
Subsidiaries  to,  keep books of record  and  account  in which  full,  true and
correct entries are made of all of its and their respective  dealings,  business
and affairs, in accordance with generally accepted accounting principles. Seller
will  employ  certified  public  accountants  selected  by  the  Board  who  are
"independent"   within  the  meaning  of  the  accounting   regulations  of  the
Commission,  and have annual audits made by such independent  public accountants
in the  course  of which  such  accountants  shall  make such  examinations,  in
accordance with generally  accepted auditing  standards,  as will enable them to
give such reports or opinions with respect to the financial statements of Seller
and its  Subsidiaries  as will satisfy the  requirements  of the  Commission  in
effect at such time with respect to certificates and opinions of accountants.

       c.  Furnishing  of  Financial  Statements  and  Information.  Seller will
deliver to Buyer:

                           i. as soon as practicable, but in any event within 45
         days after the close of each quarterly period,  unaudited  consolidated
         balance  sheets of Seller  and its  Subsidiaries  as of the end of such
         period, together with the related consolidated statements of operations
         and cash flow for such period,  setting forth the budgeted  figures for
         such period  prepared and submitted in connection  with Seller's annual
         business  plan and in  comparative  form figures for the  corresponding
         quarterly period of the previous fiscal year, all in reasonable  detail
         and certified by an authorized accounting officer of Seller, subject to
         year-end adjustments;

                           ii. as soon as  practicable,  but in any event within
         90 days after the end of each fiscal year, a consolidated balance sheet
         of Seller  and its  Subsidiaries,  as of the end of such  fiscal  year,
         together  with  the  related  consolidated  statements  of  operations,
         shareholders'  equity and cash flow for such fiscal year, setting forth
         in  comparative  form  figures for the  previous  fiscal  year,  all in
         reasonable  detail and duly  certified by Seller's  independent  public
         accountants (except for the fiscal year ended 1997, for which certified
         materials will be supplied as soon as practicable  following  Closing),
         which accountants shall have given Seller an opinion, unqualified as to
         the scope of the audit, regarding such statements;

                           iii. with reasonable promptness, such other financial
         data  relating to the  business,  affairs and  financial  condition  of
         Seller and any  Subsidiaries as is available to Seller and as from time
         to time Buyer may reasonably request; and

                           iv. at least 20 days prior to the  earlier of (1) the
         execution of any agreement  relating to any merger or  consolidation of
         Seller or any of its Subsidiaries with another  corporation,  or a plan
         of exchange involving the outstanding capital stock of Seller or any of
         its Subsidiaries,  or the sale, transfer or other disposition of all or
         substantially all of the property,  assets or business of Seller or any
         of its Subsidiaries to another  corporation,  or (2) the holding of any
         meeting of the shareholders of Seller for the purpose of approving such
         action,  written  notice of the terms and  conditions  of such proposed
         merger,  consolidation,  plan of  exchange,  sale,  transfer  or  other
         disposition.

                                       A-6
<PAGE>

       d.  Indemnification  Rights.  For a period of not less than six (6) years
from the Closing Date,  unless  otherwise  required by law, Seller will maintain
provisions  in its  articles  of  incorporation  and  by-laws  with  respect  to
indemnification of directors and officers,  whether then current or former, that
are  no  less  favorable  than  as  currently  set  forth  in  its  articles  of
incorporation and by-laws.  Further, for a period of not less than six (6) years
from the Closing Date, unless otherwise required by law, Seller will continue to
provide  indemnification of its directors and officers,  whether then current or
former, to the fullest extent permissible under Texas law.
      
     10. Buyer's Affirmative Covenants. Upon execution of this Agreement,  Buyer
agrees as follows:

       a.   Special   Shareholders'   Meeting.   In   connection   with  Special
Shareholders'  Meeting to be called pursuant to Section 7.6 herein, Buyer agrees
to assist Seller as reasonably  requested and agreed in preparing  materials and
soliciting  proxies in connection with obtaining approval of its shareholders to
increase  its  authorization  to  issue  common  stock  in  connection  with the
transaction  contemplated  by this  Agreement.  As part of  Buyer's  obligations
hereunder,  Buyer agrees  reimburse  Seller for  expenses  incurred in preparing
materials  and  soliciting  proxies,  not in excess of the  amounts set forth in
Schedule 10.1, and further to furnish Seller,  within reasonably sufficient time
to be reviewed and included in the  materials  to be mailed to  shareholders  in
connection with the Special Shareholders' Meeting, the names of Buyer's nominees
for  election  to the Board,  together  with  information  with  respect to each
nominee  equivalent to the information  required to be disclosed to stockholders
with respect to director  nominees  pursuant to Regulation 14A of the Securities
and Exchange Act and such other similar  information  that Seller may thereafter
reasonably  request.  It is  understood  that  Seller  may  refuse  to cause the
nomination and election as a director of Seller of any nominee proposed by Buyer
if (i) the information  described above is not timely furnished by Buyer or (ii)
if,  having  been  furnished,  it is the  reasonable  judgment of Seller and its
counsel that the election of such nominee would not be in the best  interests of
Seller or might tend to subject  Seller to  liability  therefor.  The  foregoing
notwithstanding,  Buyer and Seller agree to cooperate  and use their mutual best
efforts  for  the  purpose  of  preparing   for  and   conducting   the  Special
Shareholders' Meeting as promptly as possible following the Execution Date.

       b. Orders for Product. As soon as practicable following the Closing Date,
but not later than eight (8) months from the Execution Date, Buyer will take all
reasonable  efforts to cause the  placement of ten (10) product  orders,  in the
aggregate  including  any  orders  currently  under  discussion,   from  Buyer's
affiliate in Japan over a period of thirty-six (36) months from the placement of
the first order.

       c. Additional Equity. As soon as practicable  following the Closing Date,
Buyer will use its best  efforts to arrange for  additional  third party  equity
financing for Seller,  to be  contributed  to Seller over a period of no greater
than eighteen (18) months from the Closing Date, and in an aggregate  amount not
less than Eight Million U.S.  Dollars  ($8,000,000)  ("Equity  Financing").  The
parties specifically  acknowledge and anticipate that this Equity Financing will
involve and/or cause a substantial dilution of existing shareholders,  including
but not limited to Buyer.

     11. Negative  Covenants.  Seller will not,  without the prior approval of a
majority of all of the members of the Board of Directors:

       i. guarantee,  endorse or otherwise be or become contingently  liable, or
permit any  Subsidiary to guarantee,  endorse or otherwise  become  contingently
liable,  in  connection  with the  obligations,  securities  or dividends of any
person,  firm,  association  or  corporation,  other  than  Seller or any of its
Subsidiaries,  except that  Seller and any  Subsidiary  may  endorse  negotiable
instruments for collection in the ordinary course of business; or

       ii. make or permit any Subsidiary to make loans or advances to any person
(including without limitation to any officer,  director or shareholder of Seller
or any Subsidiary), firm, association or corporation,  except loans and advances
to Seller and its  wholly-owned  Subsidiaries  and  advances  to  suppliers  and
employees made in the ordinary course of business; or

       iii.  purchase or invest, or permit any Subsidiary to purchase or invest,
in the stock or obligations of any other person, firm or corporation, other than
a wholly-owned Subsidiary; or


                                       A-7
<PAGE>
       iv. pay, or permit any Subsidiary to pay, compensation, whether by way of
salaries, bonuses, participations in pension or profit sharing plans, fees under
management  contracts  or for  professional  services or fringe  benefits to any
officer  in  excess of  amounts  fixed by the  Board of  Directors  prior to any
payment to such officer.

     12.  Registration  of  Stock.  Subject  to the  provisions  of the  several
registration rights agreements and /or other agreements containing  registration
rights provisions, to which Seller is a party, all as disclosed and described on
Schedule 12 hereto, Seller agrees as follows:

       a. Rights to Registration.

                           i. If, at any time  during the period  commencing  on
         the  effective  date  of this  Agreement  and  ending  ten  (10)  years
         thereafter, Seller shall determine to register under the Securities Act
         of 1933,  as amended,  any shares of Stock to be offered for cash by it
         or others,  pursuant to a  registration  statement  on Form S-1 (or its
         equivalent),  Seller will (1) promptly give written  notice to Buyer of
         its intention to file such  registration  statement and (2) at Seller's
         expense (which shall include, without limitation,  all registration and
         filing fees,  printing expenses,  fees and disbursements of counsel and
         independent  accountants for Seller,  and fees and expenses incident to
         compliance  with state  securities  law, but shall not include fees and
         disbursements  of  counsel  for  Buyer)  include  among the  securities
         covered by the registration  statement such portions of the Shares then
         held by Buyer as shall be  specified  in a  written  request  to Seller
         within  thirty (30) days after the date on which Seller gave the notice
         described in (a)(i) above.

                           ii. Upon receipt of such  written  request and of the
         shares of Stock  specified in the request (any  shareholder  requesting
         registration being individually called a "Selling Shareholder"), Seller
         shall: (1) use its reasonable best efforts to effect the  registration,
         qualification  or compliance of the Shares under the Securities Act and
         under any other applicable federal law and any applicable securities or
         blue sky laws of  jurisdictions  within the United States;  (2) furnish
         each  Selling  Shareholder  such  number of  copies  of the  prospectus
         contained in the registration  statement filed under the Securities Act
         (including preliminary  prospectus) in conformity with the requirements
         of the  Securities  Act,  and  such  other  documents  as  the  Selling
         Shareholder   may  reasonably   request  in  order  to  facilitate  the
         disposition of the Stock covered by the registration statement; and (3)
         notify  each  Selling  Shareholders,  at any  time  when  a  prospectus
         relating  to the  Stock  covered  by  such  registration  statement  is
         required to be delivered  under the Securities Act, of the happening of
         any event as a result of which  the  prospectus  forming a part of such
         registration statement, as then in effect, includes an untrue statement
         of a material  fact or omits to state any material  fact required to be
         stated  therein  or  necessary  to  make  the  statements  therein  not
         misleading,  and at the request of the Selling Shareholders prepare and
         furnish to the Selling  Shareholders any reasonable number of copies of
         any  supplement to or amendment of such  prospectus as may be necessary
         so that,  as  thereafter  delivered to  purchasers  of the Stock,  such
         prospectus  shall not include an untrue statement of a material fact or
         omit to  state  a  material  fact  required  to be  stated  therein  or
         necessary to make the statements therein not misleading.

       b. Registration of Underwritten  Offering.  If the offering of securities
to be registered by Seller is underwritten,  each Selling shareholder shall sell
the Stock to or through the  underwriter(s)  of the securities  being registered
for the account of Seller or others upon the same terms  applicable to Seller or
others, and if the managing underwriter(s)  reasonably determine that all or any
portion of the shares of Stock held by the  Selling  Shareholders  should not be
included in the registration  statement,  then  notwithstanding  anything to the
contrary in this Section,  the  determination  of such  underwriter(s)  shall be
conclusive; provided however that if such underwriter(s) determine that some but
not all of the  Stock  of the  Selling  Shareholders  shall be  included  in the
registration  statement,  the  number of shares of Stock  owned by each  Selling
Shareholder to be included in the registration statement will be proportionately
reduced in accordance  with the  respective  written  requests given as provided
above.

                                       A-8
<PAGE>
       c.  Indemnification.  In the event that Shares purchased pursuant to this
Agreement are included in a registration statement under this Section 11, Seller
will indemnify and hold harmless each Selling Shareholder and each other person,
if any,  who  controls  such  Selling  shareholder  within  the  meaning  of the
Securities Act,  against any losses,  claims,  damages or liabilities,  joint or
several,  to which such Selling  Shareholder  or  controlling  person may become
subject under the Securities Act or otherwise,  insofar as such losses,  claims,
damages or  liabilities  (or actions in respect  thereof) arise out of are based
upon any untrue  statement or alleged  untrue  statement  of any  material  fact
contained, on the effective date thereof, in any registration statement pursuant
to which the Shares were  registered  under the Securities  Act, any preliminary
prospectus or final prospectus contained therein, or any amendment or supplement
thereto,  or arise out of or are based upon the omission or alleged  omission to
state therein a material fact required to be stated therein or necessary to make
the  statements  therein not  misleading,  or arise out of or are based upon the
failure by Seller to file any amendment or supplement  thereto that was required
to  be  filed  under  the  Securities  Act,  and  will  reimburse  such  Selling
Shareholder and each such controlling person for any legal or any other expenses
reasonably  incurred by them in connection with  investigating  or defending any
such loss, claim,  damage,  liability or action.  Notwithstanding the foregoing,
Seller  will not be liable in any such case to the  extent  that any such  loss,
claim,  damage,  or liability arises out of or is based upon an untrue statement
or omission made in such registration statement,  preliminary prospectus,  final
prospectus or amendment or  supplement  in reliance upon and in conformity  with
written  information  furnished to Seller through an instrument duly executed by
or on behalf of any Selling Shareholder  specifically for use in the preparation
of such registration  statement,  preliminary prospectus,  final prospectus,  or
amendment or supplement.

       It shall be a condition precedent to the obligation of Seller to take any
action  pursuant to this Section that seller shall have received an  undertaking
satisfactory to it from each Selling  Shareholder to indemnify and hold harmless
Seller (in the same manner and to the same extent as set forth in this Section),
each  director  of  Seller,  each  officer  who  shall  sign  such  registration
statement,  and any  persons  who  control  Seller  within  the  meaning  of the
Securities Act, with respect to any statement or omission from such registration
statement, preliminary prospectus, or any final prospectus contained therein, or
any amendment or supplement  thereto,  if such statement or omission was made in
reliance upon and in  conformity  with written  information  furnished to Seller
through an instrument duly executed by the indemnifying  party  specifically for
use in the preparation of such registration  statement,  preliminary prospectus,
final prospectus, or amendment or supplement.

       Promptly  following  receipt  by an  indemnified  party of  notice of the
commencement  of any action  involving a claim referred to above in this Section
11.3, such  indemnified  party will, if a claim in respect thereof is to be made
against  an  indemnifying  party,  give  written  notice  to the  latter  of the
commencement  of such  action.  In case any such  action is  brought  against an
indemnified party, the indemnifying party will be entitled to participate in and
to  assume  the  defense  thereof,  jointly  with any other  indemnifying  party
similarly  notified,  to the extent that it may wish,  with  counsel  reasonably
satisfactory to such  indemnified  party, and after notice from the indemnifying
party to such  indemnified  party of its election to assume the defense thereof,
the  indemnifying  party  will not be liable to such  indemnified  party for any
legal or other expenses  subsequently  incurred by the latter in connection with
the defense thereof.

       d. Binding Provisions. The provisions of this Section 11 shall be binding
on the successors of Seller.  No  Shareholder  may assign the provisions of this
Section 11 or all or any part of its or their rights or  obligations  hereunder,
except that in the event of a merger or  consolidate  in which the Seller is not
the survivor,  the Seller shall assign and transfer, and successor shall assume,
the provisions of this Section 11.

       e. Conflicts. To the extent that Seller's compliance with the obligations
set forth in Sections  12.1 through 12.4 above would  conflict with or otherwise
cause a breach of or default under any of its existing  obligations  pursuant to
the agreements  set forth on Schedule 12 attached  hereto,  Seller's  failure to
comply with those obligations shall not be deemed a breach of this Agreement.

     13. Remedies Cumulative, and not Waived.

       i. No right, power or remedy conferred upon any party shall be exclusive,
and each such  right,  power or remedy  shall be  cumulative  and in addition to
every other  right,  power or remedy,  whether  conferred  hereby or by any such
security  or now or  hereafter  available  at law or in equity or by  statute or
otherwise.
                                       A-9
<PAGE>
       ii. No course of dealing  between the parties or the holder of any Shares
purchased  pursuant to this  Agreement,  and no delay in  exercising  any right,
power or remedy  conferred  hereby or by any such  security or now or  hereafter
existing  at law or in equity or by statute  or  otherwise,  shall  operate as a
waiver of or  otherwise  prejudice  any such right,  power or remedy;  provided,
however,  that this Section 13 shall not be construed or applied so as to negate
the provisions and intent of any statute which is otherwise applicable.

     14. Changes.  Waivers. etc. Neither this Agreement nor any provision hereof
may be changed, waived, discharged or terminated orally, but only by a statement
in writing signed by the party against which enforcement of the change,  waiver,
discharge or termination is sought.

     15.  Notices.  All notices,  requests,  consents  and other  communications
required or permitted  hereunder shall be in writing and shall be delivered,  or
mailed  first-class  postage  prepaid,  registered  or  certified  mail,  or via
overnight  delivery  with by a service  providing  evidence  of  receipt  to the
addresses below:

                  If to Buyer:

                           Imatron Inc.
                           389 Oyster Point Blvd.
                           South San Francisco, CA 94080
                           Attn: Mr. S. Lewis Meyer, President
                           Telephone: (415) 583-9964
                           Facsimile: (415) 871-0418

                  Copy to:

                           Roger S. Mertz, Esq.
                           Severson & Werson, P.C.
                           One Embarcadero Center
                           Suite 2600
                           San Francisco, CA 94111
                           Telephone: (415) 398-3344
                           Facsimile: (415) 956-0439

                  If to Seller:

                           Positron Corporation
                           1304 Langham Creek Drive, Suite 310
                           Houston, Texas 77084
                           Attn: President
                           Telephone: (281) 492-7100
                           Facsimile: (281) 492-2961

                  Copy to:

                           Michael D. Wortley, Esq.
                           Vinson & Elkins
                           3700 Trammell Crow Center
                           2001 Ross Avenue
                           Dallas, Texas 75201
                           Telephone: (214) 220-7700
                           Facsimile: (214) 999-7732


                                      A-10
<PAGE>
and such  notices  and  other  communications  shall  for all  purposes  of this
Agreement  be  treated as being  effective  or having  been  given if  delivered
personally,  or, if sent by first class mail,  three days after  posting,  or if
sent via  overnight  delivery,  when  received as  evidenced  by an  appropriate
receipt.

     16. Survival of Representations  and Warranties,  etc. All  representations
and warranties contained herein shall survive the execution and delivery of this
Agreement, any investigation at any time made by Buyer or on its behalf, and the
sale  and  purchase  of the  Common  Shares.  All  statements  contained  in any
certificate,  instrument  or other  writing  delivered by or on behalf of Seller
pursuant  hereto or in  connection  with or  contemplation  of the  transactions
herein contemplated (other than legal opinions) shall constitute representations
and warranties by Seller hereunder, and not by the individual officer who signed
the certificate, instrument or writing by or on behalf of Seller.

     17.  Parties in Interest.  All the terms and  provisions of this  Agreement
shall be  binding  upon and inure to the  benefit of and be  enforceable  by the
respective successors and assigns of the parties hereto, whether so expressed or
not, and, in particular, shall inure to the benefit of and be enforceable by the
holder or holders at the time of any of the Common Shares.  The former,  current
and hereafter  appointed officers and directors  referenced in Section 9.4 above
are intended and deemed to be third party  beneficiaries of Section 9.4, and are
entitled to enforce its provisions.

     18. Headings. The headings of the Sections and paragraphs of this Agreement
have been inserted for  convenience  of reference  only and do not  constitute a
part of this Agreement.

     19.  Choice of Law. It is the  intention  of the  parties  that the laws of
California shall govern the validity of this Agreement,  the construction of its
terms and the interpretation of the rights and duties of the parties.

     20.  Counterparts.  This Agreement may be executed  concurrently  in two or
more counterparts,  each of which shall be deemed an original,  but all of which
together shall constitute one and the same instrument.

     21.  Severability.  In the  event  that  any  part  of  this  Agreement  is
determined by a court of competent jurisdiction to be unenforceable, the balance
of the Agreement shall remain in full force and effect.

                  [Remainder of page intentionally left blank.]


                                       A-11
<PAGE>
         IN WITNESS  WHEREOF,  the parties execute this Agreement as of the date
first written above.

                                               SELLER:

ATTEST:                                        POSITRON CORPORATION


/s/ Howard R. Baker                            By: /s/ Gary B. Wood
Howard R. Baker                                Gary B. Wood
Executive Vice President                       Chief Executive Officer


                                               BUYER:

                                               IMATRON INC.


/s/ Gary H. Brooks                             By: /s/ S. Lewis Meyer 
Gary H. Brooks                                 S. Lewis Meyer
Chief Financial Officer                        President/Chief Executive Officer


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