POSITRON CORP
PRER14A, 1998-11-05
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:

  [X]  Preliminary Proxy Statement

  [ ]  Confidential, for Use of the Commission
        only (as permitted by Rule 14a-6(e)(2))

  [ ]  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:


                                       1
<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. (the "Annual  Meeting")  time 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 2,
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
_______________, 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.


                                       2
<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 _________________, 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 June 30, 1998, are
enclosed herewith.



                                       3
<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  2, 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.  Such votes are not
discretionary items because a portion of the shares to be authorized pursuant to
such  proposal  will be used in  connection  with the  Imatron  Transaction  (as
defined below).

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.


                                       4
<PAGE>
         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.

         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.  Such votes are not
discretionary items because a portion of the shares to be authorized pursuant to
such  proposal  will be used in  connection  with the  Imatron  Transaction  (as
defined below).

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.

                                       5
<PAGE>
         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."

         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 or unwilling 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 or unwilling 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").

                                       6
<PAGE>
         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
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.

                                       7
<PAGE>
         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  increased 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.  The loan  agreement  has been
amended by oral agreement to increase the working capital advances  available to
the  Company  under the  Agreement  up to an  additional  $250,000.  Imatron has
already advanced an additional $100,000 pursuant to the amended agreement.

         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,   excluding   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 as of June 30, 1998,  the Company  would have been
obligated to issue  approximately  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 take,
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 several other high tech  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.

         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  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. 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 (the
"ProFutures  Loan") (with a balance of  approximately  $570,000 at September 30,
1998) 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,  Ltd. agreed to subordinate its loan (with
a  balance  of   approximately   $767,000  plus  accrued   interest  payable  of
approximately  $286,000  at  September  30,  1998) 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
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,  Ltd.  agreed to  subordinate  its loan to Imatron's  loan.
Except as modified by the amendments, the remaining agreements remain the same.


                                       8
<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  basis)  will be reduced by 51%. In such case,  assuming  that the
Imatron  Transaction  closed as of June 30, 1998,  each  existing  shareholder's
ownership  percentage of Common Stock (on an outstanding basis) 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."


         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.

         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.

                                       9
<PAGE>
         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.

Information  Regarding  Directors to Fill  Vacancies  Upon  Consummation  of the
Imatron Transaction

         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.


                                       10
<PAGE>


         Gary   H.   Brooks,    50,   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.

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.


                                       11
<PAGE>
<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>
                                        12
</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>
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 June 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.


                                       13
<PAGE>
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.

         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 August 15, 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.

                                       14
<PAGE>
         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 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  to  non-employee
directors.

         The  Compensation  Committee of the Board of Directors  administers the
1994 Plan.  The  Compensation  Committee  consists of two or more 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. Schilling and Dr. Gould.

         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.

                                       15
<PAGE>

         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 accounts 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.

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.

                                       16
<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 six months ended June 30, 1998.

                                                        POSITRON CORPORATION
                                                           BALANCE SHEETS
                                                        --------------------
                                                (In thousands, except per share data)
                                                                                                       June 30,         December 31,
                                                                                                         1998               1997
                                                                                                       --------            --------
                                                                                                     (Unaudited)            (Note)
<S>                                                                                                    <C>                 <C>     
ASSETS:
Current assets:
  Cash and cash equivalents                                                                            $     70            $    160
  Accounts receivable, net                                                                                  326                 253
  Inventories                                                                                               331                 408
  Prepaid expenses                                                                                          197                 131
                                                                                                       --------            --------
    Total current assets                                                                                    924                 

  Plant and equipment, net                                                                                  590                 715
                                                                                                       --------            --------
    Total assets                                                                                       $  1,514            $  1,498
                                                                                                       ========            ========
LIABILITIES AND STOCKHOLDERS' DEFICIT
Current liabilities:
  Accounts payable, trade                                                                              $  1,327            $  1,573
  Accrued liabilities                                                                                     3,021               3,096
  Note payable to an affiliate                                                                              767                 767
  Other note payable                                                                                      1,152                 930
                                                                                                       --------            --------
    Total current liabilities                                                                             6,267               6,366
                                                                                                       --------            --------

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 June 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 June 30, 1998 and
    December 31, 1997, respectively                                                                          52                  51
  Additional paid-in capital                                                                             42,221              42,191
  Accumulated deficit                                                                                   (49,200)            (48,960)
  Treasury Stock: 60,156 shares at cost                                                                     (15)                (15)
                                                                                                       --------            --------
    Total stockholders' deficit                                                                          (5,353)             (5,113)
                                                                                                       --------            --------

    Total liabilities and stockholders' deficit                                                        $  1,514            $  1,498
                                                                                                       ========            ========
<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>
                                       17
</TABLE>
<PAGE>
<TABLE>
                                                        POSITRON CORPORATION
                                                      STATEMENTS OF OPERATIONS
                                                      ------------------------
                                                  (In thousands, except share data)
                                                             (Unaudited)

<CAPTION>
                                                                     Three Months Ended                     Six Months Ended
                                                                 June 30,          June 30,            June 30,           June 30,
                                                                   1998              1997                1998               1997
                                                               -----------        -----------        -----------        -----------
<S>                                                            <C>                <C>                <C>                <C>        
Revenues:
  Fee per scan                                                 $       199        $        86        $       307        $       208
  Service and component                                                414                391                780                889
                                                               -----------        -----------        -----------        -----------
    Total revenues                                                     613                477              1,087              1,097
                                                               -----------        -----------        -----------        -----------

Costs of sales and services:
  Fee per scan                                                          40                 39                 60                 78
  Service, warranty and component                                       91                 82                178                279
                                                               -----------        -----------        -----------        -----------
    Total costs of sales and services                                  131                121                238                357
                                                               -----------        -----------        -----------        -----------

      Gross profit                                                     482                356                849                740
                                                               -----------        -----------        -----------        -----------

Operating expenses:
  Research and development                                               8                141                 18                616
  Selling and marketing                                                  2                143                 16                343
  General and administrative                                           399                343                894              1,247
                                                               -----------        -----------        -----------        -----------
    Total operating expenses                                           409                627                928              2,206
                                                               -----------        -----------        -----------        -----------

      Income (loss) from operations                                     73               (271)               (79)            (1,466)
                                                               -----------        -----------        -----------        -----------

Other income (expenses):
  Other expense                                                       --                  (48)              --                  (99)
  Interest expense                                                     (78)              (102)              (161)              (191)
                                                               -----------        -----------        -----------        -----------
    Total other expense                                                (78)              (150)              (161)              (290)
                                                               -----------        -----------        -----------        -----------

Net income (loss)                                              $        (5)       $      (421)       $      (240)       $    (1,756)
                                                               ===========        ===========        ===========        ===========

Basic and dilutive net loss per common share                   $      0.00        $     (0.09)       $     (0.05)       $     (0.38)
                                                               ===========        ===========        ===========        ===========

Weighted average common shares outstanding                       5,144,291          4,831,653          5,139,191          4,629,255
                                                               ===========        ===========        ===========        ===========
<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>
                                       18
</TABLE>
<PAGE>
<TABLE>
                                                        POSITRON CORPORATION
                                                      STATEMENTS OF CASH FLOWS
                                                      ------------------------
                                                           (In thousands)
                                                             (Unaudited)
<CAPTION>
                                                                                                              Six Months Ended
                                                                                                          June 30,          June 30,
                                                                                                            1998              1997
                                                                                                          -------           -------
<S>                                                                                                       <C>               <C>     
Cash flows from operating activities:
  Net loss                                                                                                $  (240)          $(1,756)
  Adjustment to reconcile net loss to net cash used in operating activities                                   (72)            1,438
                                                                                                          -------           -------
    Net cash used in operating activities                                                                    (312)             (318)
                                                                                                          -------           -------

Cash flows from investing activities:
  Capital expenditures                                                                                       --                 (44)
                                                                                                          -------           -------
    Net cash used in investing activities                                                                    --                 (44)
                                                                                                          -------           -------

Cash flows from financing activities:
  Proceeds from other notes payable, net of repayments                                                        222              --
  Proceeds from conversion of warrants to common stock                                                       --                  (8)
                                                                                                          -------           -------
    Net cash used in financing activities                                                                     222                (8)
                                                                                                          -------           -------

Net decrease in cash and cash equivalents                                                                     (90)             (370)

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

Cash and cash equivalents, end of year                                                                    $    70           $    12
                                                                                                          =======           =======
<FN>
                                                       See accompanying notes.
</FN>
                                       19
</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
         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 six  months  ended  June  30,  1998  were
         $4,455,000 and $240,000,  respectively.  The Company has an accumulated
         deficit of  $49,200,000  at June 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 June 30,  1998,  the  Company had cash and cash  equivalents  in the
         amount of $70,000  compared to $160,000 at December  31,  1997.  During
         1997 and the first six 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 June 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 six months  ended June 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.

                                       20
<PAGE>
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 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
         increased  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.  The loan  agreement has been amended by
         oral agreement to increase the working  capital  advances  available to
         the Company under the agreement up to an additional $250,000.

         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,  excluding  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 June 30, 1998 the
         Company  would  have been  obligated  to issue nine  million  shares of
         Common  Stock.  The  Company  will  receive a nominal  cash amount from
         Imatron in payment for the shares.

         Imatron,  in addition to providing  limited working capital  financing,
         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, an affiliate of Imatron, Inc. is
         a major distributor for Imatron's Ultrafast CT and for the equipment of
         certain  other  high  technology  companies.  Imatron  has a 24 percent
         minority interest in Imatron Japan.

         Imatron will also help facilitate the  recapitalization  of Positron 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 in the third quarter of this year
         if such 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

                                       21
<PAGE>
         whereby  (a)  ProFutures  waived all past  defaults  and  extended  the
         maturity  of its loan  (with a balance  of  approximately  $570,000  at
         September  30,  1998) 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 balance of  approximately  $767,000  plus
         accrued  interest  payable of  approximately  $286,000 at September 30,
         1998) to Imatron's loan, and (d)  ProFutures's  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
         Positron's  debt to both  ProFutures and Imatron.  Consistent  with the
         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,
         Ltd.  agreed  to  subordinate  its loan to  Imatron's  loan.  Except as
         modified by the amendments, the remaining agreements remain the same.

         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 that the  Company's  assets
         will be seized by its secured creditors.

7.       Contingency

         The Company  previously  entered into  agreements with Nizar A. Mullani
         and K. Lance Gould under  which such  individuals  agreed to reduce the
         royalty  payments  due to  them  by the  Company  in  consideration  of
         payments to be made to them under consulting  agreements and promissory
         notes. The consulting  agreements  provide that if the Company defaults
         in its payment obligations  thereunder,  then Mr. Mullani and Dr. Gould
         would be  entitled  to  receive a regrant  of the  royalties  that they
         previously  released.  On April 12, 1998, the Company received a demand
         letter from Mr. Mullani alleging default under his consulting agreement
         and  demanding  the  regrant  of an  additional  1%  royalty  interest.
         Although the Company has not  received any such demand from Dr.  Gould,
         the Company believes that a payment default may have occurred under Dr.
         Gould's  consulting  agreement and that as a result thereof,  Dr. Gould
         may be entitled to the regrant of an additional .05% royalty  interest.
         The Company  anticipates  initiating  settlement  discussions  with Mr.
         Mullani and Dr. Gould  concerning  the alleged  payment  defaults.  The
         Company is unable to predict  the outcome of such  discussions  at this
         time.  If the parties fail to reach a settlement,  Mr.  Mullani will be
         entitled  to receive an  aggregate  2%  royalty  and Dr.  Gould 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.

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 amounts 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
                                       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>

         Following are financial statements and the notes thereto of the Company
for the year ended December 31, 1997.
<TABLE>
                                                        POSITRON CORPORATION
                                                           BALANCE SHEETS
                                                        --------------------
                                                  (In thousands, except share data)
<CAPTION>
                                                                                                                December 31,
                                                                                                           1997              1996
                                                                                                         --------          --------
<S>                                                                                                      <C>               <C>     
ASSETS:
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
     General

       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. Plant and Equipment

                                       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.

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.

                                       30
<PAGE>

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                      135                  368
Accounts receivable-- fee per scan                     334                  180
Accounts receivable-- other                             --                   41
                                                    ------               ------
                                                     1,480                1,600
Less allowance for doubtful accounts                (1,227)              (1,080)
                                                    ------               ------
                                                    $  253               $  520
                                                    ======               ======

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
                                                    ======               ======

         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.


                                       31
<PAGE>

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.

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

                                       32
<PAGE>
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%.

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)      $ (0.93)      $ (1.67)       $ (1.70)


                                       34
<PAGE>

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 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.


                                       35
<PAGE>
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 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.

                                       36
<PAGE>
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.

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.


                                       37
<PAGE>

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 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

                                       38
<PAGE>
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.

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.

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  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. If the parties fail to reach a settlement,  one payee
may be entitled to receive an  aggregate  2% royalty and the second payee may 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.

                                       39
<PAGE>
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.

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.

Based on a preliminary  assessment,  the Company  believes  that no  significant
modifications  to its existing  computer  software will be required and that its
existing  computer  systems will function  properly with respect to dates in the
year 2000 and  thereafter.  The Company also  believes that costs related to the
Year 2000 issue will not be significant.  However,  due to the Company's current
severe  liquidity  problems,  the  Company has been unable to perform a complete
assessment of Year 2000 issues and has developed no contingency plan with regard
to unsolved Year 2000 problems that may arise.

The  Company  is also  currently  performing  a  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.  Based on such  preliminary  assessment,
management  believes  that the Company does not have  significant  exposure with
respect to third parties.

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.

                                       40
<PAGE>
16. Subsequent Events

In June 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 to enable the Company to meet a portion of its current obligations.  As
of June 30,  1998,  the Company had  received  advances  totaling  approximately
$468,000.  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.

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,   excluding   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 June 30,  1998,  the Company  would have been  obligated to
issue nine million  shares of Common  Stock.  The Company will receive a nominal
cash amount of $100 from Imatron in payment for the shares.

Imatron, in addition to providing limited working capital financing,  has agreed
to support the Company's marketing program particularly with regard to Imatron's
affiliate,  Imatron Japan, Inc. by agreeing to intake,  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  during 1997.  Imatron Japan,  an affiliate of Imatron,  is a
major  distributor  for  Imatron's  Ultrafast CT and for the products of certain
other high technology  companies.  Imatron has a 24 percent 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 eighteen-month period in an
aggregate amount of at least  $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 of the Company's  officers,  (b) the
resignation  of at least three of the Company's  four current  directors and the
appointment of Imatron's nominees to fill vacancies so created, and (c) approval
by the  Company's  shareholders  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 in
the third quarter of this year if such shareholder approval is obtained.

In connection with the Imatron Transaction, 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 balance of approximately  $845,000 at December 31, 1997)
to December 5, 1998, in return for a $50,000  payment,  the issuance of warrants
to purchase  1,150,000  shares of the Company's  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 the Company's 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  $207,000 at December 31, 1997) 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.

                                       41
<PAGE>

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.

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
                                                            =====          =====

                                       42
<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 six
months  ended June 30, 1998 and the year ended  December  31, 997 give effect to
the Imatron  Transaction  as if it had occurred on January 1, 1997. An Unaudited
Proforma  Condensed  Balance Sheet as of June 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.


                                       43
<PAGE>
<TABLE>
                                                        POSITRON CORPORATION
                                                  PROFORMA STATEMENT OF OPERATIONS
                                                  --------------------------------
                                                  (In thousands, except share data)

<CAPTION>
                                                                                              Six Months
                                                                                                Ended                   Year Ended
                                                                                               June 30                 December 31,
                                                                                                 1998                      1997
                                                                                             ------------              ------------
<S>                                                                                          <C>                       <C>       
Revenues:
     System sales                                                                            $       --                $      1,129
     Fee per scan                                                                                     307                       602
     Service and component                                                                            780                     1,795
                                                                                             ------------              ------------
         Total revenues                                                                             1,087                     3,526
                                                                                             ------------              ------------
Costs of sales and services:
     System sales                                                                                    --                         698
     Fee per scan                                                                                      60                       156
     Service, warranty and component                                                                  178                       645
     Provision for inventory obsolescence                                                            --                       1,224
                                                                                             ------------              ------------
         Total costs of sales and service                                                             238                     2,543
                                                                                             ------------              ------------
           Gross profit                                                                               849                       983
                                                                                             ------------              ------------
Operating expenses:
     Research and development                                                                          18                     1,305
     Selling, general and administrative expenses                                                     910                     3,609
                                                                                             ------------              ------------
         Total operating costs                                                                        928                     4,914
                                                                                             ------------              ------------

Loss from operations                                                                                  (79)                   (3,931)
                                                                                             ------------              ------------
Other expenses:
     Interest expense                                                                                (161)                     (334)
     Other expense                                                                                   --                        (190)
                                                                                             ------------              ------------
         Total other expense                                                                         (161)                     (524)
                                                                                             ------------              ------------
Net loss                                                                                     $       (240)             $     (4,455)
                                                                                             ============              ============

Basic and dilutive net loss per common share
     as reported                                                                             $      (0.05)             $      (0.91)
                                                                                             ============              ============
Proforma basic and dilutive net loss per common share                                        $      (0.02)             $      (0.32)
                                                                                             ============              ============

Weighted average common shares outstanding                                                      5,139,191                 4,884,870
Additional shares to be issued in connection with the
     proposed Imatron Transaction(1)                                                            9,000,000                 9,000,000
                                                                                             ------------              ------------
Proforma weighted average shares outstanding                                                   14,139,191                13,884,870
                                                                                             ============              ============
<FN>
                                      See notes to unaudited proforma statements of operations.
</FN>
                                                                 44
</TABLE>
<PAGE>
                              POSITRON CORPORATION
                   NOTES TO UNAUDITED STATEMENTS OF OPERATIONS
                   -------------------------------------------

1.  Basis of Presentation

The following  Unaudited  Proforma  Statements of Operations  for the six months
ended June 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.

                                       45
<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 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.

                                       46
<PAGE>

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 half 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 and second quarters of 1998, the
Company made payments to such management level employees to reduce its liability
for past due  salaries  and wages to  approximately  $600,000 at June 30,  1998.
Additionally, the Company is in arrears to many of its vendors and suppliers. As
of  June  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.

                                       47
<PAGE>
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 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.

                                       48
<PAGE>

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
increased  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.
The loan  agreement  has been amended by oral  agreement to increase the working
capital  advances  available  to  the  Company  under  the  agreement  up  to an
additional $250,000.

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, excluding 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 June 30, the  Company  would  have been  obligated  to issue at least
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 take,
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 several other high tech  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.

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  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. 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 balance of
approximately  $570,000  at  September  30,  1998)  (the  "ProFutures  Loan") to

                                       49
<PAGE>
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,  Ltd.  agreed to  subordinate  its loan (with a
balance of approximately $767,000 plus accrued interest payable of approximately
$286,000 at September  30,  1998) 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 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,  Ltd.
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 to
retire the remaining balance 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 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 may be forced to seek  protection  under the
Federal Bankruptcy laws.

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:

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.

                                       50
<PAGE>
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.

Six Months  Ended June 30,  1998  Compared  to Six Months  Ended June 30,  1997.
During the six months ended June 30, 1998,  the Company  continued to experience
deterioration  in its  financial  condition;  however,  the  Company's  net loss
decreased  $1,516,000  from $1,756,000 for the six months ended June 30, 1997 to
$240,000 for the six months ended June 30,  1998.  This  decrease in net loss is
primarily  the result of  significant  staff  reductions  and efforts to curtail
costs.

The Company  generated  no revenue from system sales during the first six months
of 1998 or 1997. Fee per scan revenue increased $99,000 from $208,000 during the
first six  months  of 1997 to  $307,000  for the  first  six  months of 1998 due
primarily to a greater  number of scans being  performed  by Buffalo  Cardiology
during the six months ended June 30, 1998. In addition,  there was a decrease in
service and component  sales  revenue of $109,000  during the same period due to
less service  work  performed  during the six months  ended June 30, 1998.  This
reduction  in service  work is directly  attributable  to staff  reductions  and
normal fluctuations in service.

Gross  profit  during  the first six  months of 1998 was  $849,000  compared  to
$740,000 for the six months ended June 30, 1997.  This  increase in gross profit
of  $109,000  is due  primarily  to  lower  service  costs  brought  on by staff
reductions during the six months ended June 30, 1998.

Total  operating  expense  decreased   approximately   $1,278,000  or  58%  from
$2,206,000 for the six months ended June 30, 1997 to $928,000 for the six months
ended June 30, 1998.  The decrease  primarily  results  from  significant  staff
reductions and related  reductions in  administrative  overhead costs during the
six months ended June 30, 1998.

Interest expense  decreased from $191,000 for the six months ended June 30, 1997
to  $161,000  for the six  months  ended  June  30,  1998 due  primarily  to the
reduction  in the  Company's  debt  level in the  first  six  months  of 1998 as
compared to the first six 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 six
months ended June 30, 1998 were $4,455,000 and $240,000,  respectively.  At June
30, 1998, the Company had an accumulated  deficit of approximately  $49,200,000.
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 June 30,  1998,  the Company had cash and cash  equivalents  in the amount of
$70,000  compared to $160,000 at December 31, 1997.  Throughout much of 1997 and
the first  half 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 June 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 that the Company's  assets will be seized by its
secured creditors.

                                       51
<PAGE>

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.

Arbitration  procedures  have  been  initiated  against  the  Company  in  China
involving a dispute with respect to a POSICAM(TM)  system.  The Company  entered
into a contract with a Chinese  company in September 1996 to provide the company
with a POSICAM(TM)  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 POSICAM(TM)  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.

The Company  previously  entered  into  agreements  with Nizar A. Mullani and K.
Lance Gould under which such  individuals  agreed to reduce the royalty payments
due to them by the Company in consideration of payments to be made to them under
consulting  agreements and promissory notes. The consulting  agreements  provide
that if the Company  defaults in its payment  obligations  thereunder,  then Mr.
Mullani and Dr.  Gould  would be entitled to receive a regrant of the  royalties
that they previously released.  On April 12, 1998, the Company received a demand
letter from Mr.  Mullani  alleging  default under his  consulting  agreement and
demanding the regrant of an additional 1% royalty interest. Although the Company
has not received any such demand from Dr.  Gould,  the Company  believes  that a
payment  default may have occurred  under Dr. Gould's  consulting  agreement and
that as a result  thereof,  Dr.  Gould  may be  entitled  to the  regrant  of an
additional 0.5% royalty interest.  The Company anticipates initiating settlement
discussions  with Mr.  Mullani and Dr.  Gould  concerning  the  alleged  payment
defaults.  The Company is unable to predict the outcome of such  discussions  at
this  time.  If the  parties  fail to reach a  settlement,  Mr.  Mullani  may be
entitled to receive an  aggregate  2% royalty  and Dr.  Gould may 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.

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.

Based on a preliminary  assessment,  the Company  believes  that no  significant
modifications  to its existing  computer  software will be required and that its
existing  computer  systems will function  properly with respect to dates in the
year 2000 and  thereafter.  The Company also  believes that costs related to the
Year 2000 issues will not be significant.  However, due to the Company's current
severe  liquidity  problems,  the  Company has been unable to perform a complete
assessment of Year 2000 issues and has developed no contingency plan with regard
to unsolved Year 2000 problems that may arise.

The  Company  is also  currently  performing  a  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.  Based on such  preliminary  assessment,
management  believes  that the Company does not have  significant  exposure with
respect to third parties.

The Company's preliminary assessments indicate 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.

                                       52
<PAGE>
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.


                                       53
<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 June 30, 1998,  the Company had a total capital and
surplus deficit of $(5,353,000). 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 June 30,  1998,  the  closing  price of the Common
Stock was $0.25.

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.



                                       54
<PAGE>
                 PRINCIPAL SHAREHOLDERS AND MANAGEMENT OWNERSHIP

         The following table sets forth certain information as of June 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, June 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

                                       55
<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>

                 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


                                       56
<PAGE>
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.

             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.
                                       57
<PAGE>

                          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.

                             AVAILABLE INFORMATION

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.

                                  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
_______________, 1998

                                       58
<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  __________,  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.


                                       59
<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: |_|



                                       60
<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.

                                       61
<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.

                                       62
<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.

                                       63
<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.


                                       64
<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.

                                       65
<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.

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<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


                                       67
<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.

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<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.
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<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


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<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.]


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<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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