POSITRON CORP
10KSB/A, 1998-11-05
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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                                      U.S. SECURITIES AND EXCHANGE COMMISSION
                                              Washington, D.C. 20549

                                                    Form 10-KSB

[X]      ANNUAL REPORT UNDER SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE
         ACT OF 1934
     
                   For the fiscal year ended December 31, 1997

[  ]     TRANSITION REPORT UNDER SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE
         ACT OF 1934
                
         For the transition period from ____________ to ________________


                             Commission file 0-24092


                              POSITRON CORPORATION
                 (Name of small business issuer in its charter)


                                     Texas
         (State or other jurisdiction of incorporation or organization)
                              I.D. No. 76-0083622
           1304 Langham Creek Drive, Suite 310, Houston, Texas 77084
                    (address of principal executive offices)
                   Issuer's telephone number: (281) 492-7100

         Securities  registered  under  Section  12(b)  of  the Exchange Act:

                                      None

         Securities  registered  under  Section  12(g)  of  the Exchange Act:

                          Common Stock, $.01 par value
                               Redeemable Warrants

         Check whether the issuer (1) filed all reports  required to be filed by
Section 13 or 15(d) of the  Securities  Exchange  Act of 1934 during the past 12
months (or for such shorter period that the registrant was required to file such
reports),  and (2) has been subject to such filing  requirements for the past 90
days.
                              Yes   X         No
                                  -----          -----

         Check if there is no  disclosure  of  delinquent  filers in response to
Item 405 of  Regulation  S-B contained in this form,  and no disclosure  will be
contained,  to the  best of  registrant's  knowledge,  in  definitive  proxy  or
information statements incorporated by reference in Part III of this Form 10-KSB
or any amendment to this Form 10-KSB.[X]

         Issuer's revenues for fiscal year ended December 31, 1997: $3,526,000

         As of June 30, 1998,  there were 5,159,592  shares of the  Registrant's
Common Stock, $.01 par value outstanding.

Documents incorporated by reference: None

                                        1
<PAGE>
                                     PART I

         The Company is including  the  following  cautionary  statement in this
Annual Report on Form 10-KSB to make  applicable  and take advantage of the safe
harbor provision of the Private Securities Litigation Reform act of 1995 for any
forward looking statements made by, or on behalf of the Company. Forward looking
statements include statements  concerning plans,  objectives,  goals strategies,
future events or performance  and underlying  assumptions  and other  statements
which  are  other  than  statements  of  historical  facts.  Certain  statements
contained herein are forward looking statements and, accordingly,  involve risks
and  uncertainties  which  could  cause  actual  results or  outcomes  to differ
materially from those expressed in the forward looking statements. The Company's
expectations,  beliefs  and  projections  are  expressed  in good  faith and are
believed  by  the  Company  to  have  a  reasonable  basis,   including  without
limitations,  management's  examination  of historical  operating  trends,  data
contained in the Company's  records and other data available from third parties,
but  there  can  be no  assurance  that  management's  expectation,  beliefs  or
projections  will result or be achieved  or  accomplished.  In addition to other
factors and matters  discussed  elsewhere  herein,  the  following are important
factors that, in the view of the Company,  could cause actual  results to differ
materially from those discussed in the forward looking  statements:  the ability
of the  Company  to  attain  widespread  market  acceptance  of its  POSICAM(TM)
systems;  the ability of the Company to obtain  acceptable  forms and amounts of
financing to fund future  operations;  demand for the  Company's  services;  and
competitive  factors. The Company disclaims any obligation to update any forward
looking statements to reflect events or circumstances after the date hereof.

Item 1.  Description of Business

General

         Positron  Corporation  (the "Company") was incorporated in the State of
Texas on December 20, 1983,  and commenced  commercial  operations in 1986.  The
Company designs,  manufacturers,  markets and services, advanced medical imaging
devices utilizing  positron  emission  tomography  ("PET")  technology under the
trade-name  POSICAM(TM)  systems.   Unlike  other  currently  available  imaging
technologies, PET technology permits the measurement of the biological processes
of organs and tissues as well as producing  anatomical  and  structural  images.
POSICAM(TM)  systems,  which  incorporate  patented and proprietary  technology,
enable  physicians  to diagnose and treat  patients in the areas of  cardiology,
neurology and oncology. The United States Food and Drug Administration  approved
the initial  POSICAM(TM)  system for  marketing in 1985,  and as of December 31,
1997,  the Company has sold twenty (21)  POSICAM(TM)  systems,  of which fifteen
(15)  are in  leading  medical  facilities  in the  United  States,  two (2) are
installed  in   international   medical   institutions,   one  (1)  is  awaiting
governmental  approval for installation at a facility in Japan and three (3) are
no longer operational.  The Company presently markets its POSICAM(TM) systems at
list prices up to $2.0 million  depending upon the  configuration  and equipment
options of the particular system.

         The  following  table  provides  summary   information   regarding  the
Company's  installed base of POSICAM(TM)  systems,  which were operational as of
December 31, 1997:
<TABLE>
<CAPTION>
                                                                                        Date of
Site                            Location          Clinical Application             Installation

<S>                             <C>               <C>                                     <C> 
Prototype:
U.T. Health Science Center      Houston, TX       Neurology/Cardiology                    1985

POSICAM(TM) Systems:
Saint Joseph's Hospital         Atlanta, GA       Cardiology                              1988
Cleveland Clinic Foundation     Cleveland, OH     Neurology/Cardiology                    1988
Memorial Hospital               Jacksonville, FL  Oncology/Cardiology                     1988
Kennestone Hospital             Marietta, GA      Cardiology                              1989
Medical City Dallas             Dallas, TX        Cardiology                              1990

                                       2
<PAGE>

Yale/Veterans Adm.              New Haven, CT     Neurology/Oncology/Cardiology           1991
Beth Israel                     New York, NY      Cardiology                              1991
Our Lady of The Lake            Baton Rouge, LA   Cardiology                              1992
Crawford Long Hospital          Atlanta, GA       Cardiology                              1992
Hermann Hospital                Houston, TX       Neurology/Oncology/Cardiology           1993
Hadassah Medical Organization   Israel            Neurology/Oncology/Cardiology           1995
Bio-Metabolic, Inc.             Detroit, MI       Cardiology/Oncology                     1995
Bergan Mercy Hospital           Omaha, NE         Cardiology/Oncology                     1995
Buffalo Cardiology & Pulmonary
 Associates                     Buffalo, NY       Cardiology                              1995
University of Madrid            Spain             Cardiology/Oncology/Neurology           1995
Baptist Hospital                Nashville, TN     Cardiology/Oncology                     1996
Imatron                         Japan             Cardiology/Oncology                     1997
</TABLE>

         PET  technology  is an advanced  imaging  technique,  which permits the
measurement  of the  biological  processes  of  organs  and  tissues  as well as
producing  anatomical and structural images.  Other advanced imaging techniques,
such as magnetic  resonance  imaging ("MRI") and  computerized  axial tomography
("CAT") scans,  produce  anatomical and structural  images,  but do not image or
measure biological processes. The ability to measure biological abnormalities in
tissues and organs  allows  physicians  to detect  disease at an early stage and
provides physicians with information,  which would otherwise be unavailable,  to
diagnose and manage the  treatment  of disease.  The Company  believes  that PET
technology can lower the total cost of managing  certain diseases by providing a
means for early  diagnosis  and reduction of expensive  invasive or  unnecessary
procedures, such as angiograms or biopsies which in addition to being costly and
painful, may not be necessary or appropriate.

         Commercial utilization of PET technology commenced in the mid-1980s and
the Company is one of several commercial manufacturers of PET imaging systems in
the United States.  Although the other  manufacturers are substantially  larger,
the Company believes that its POSICAM(TM)  systems have proprietary  operational
and  performance   characteristics,   which  may  give  it  certain  performance
advantages  over other  commercially  available  PET systems.  Such  performance
advantages include the POSICAM(TM)  systems high count-rate  sensitivity,  which
results  in  faster  imaging,  an  enhanced  ability  to use  certain  types  of
radiopharmaceuticals,  which  minimize  patient  exposure to  radiation  and its
ability to minimized false positive and false negative diagnoses of disease. The
industry  in which the  Company is  engaged  is,  however,  subject to rapid and
significant technological change. There can be no assurance that the 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 noncompetitive.  See "Item
1.    Description    of   Business   -   Risks    Associated    with    Business
Activities--Substantial Competition and effects of Technological Change."

         The Company's primary focus to date has been on the clinical cardiology
market, where its POSICAM(TM) systems have been used to assess diseases, such as
the effect of arterial blockages and heart damage due to heart attacks.  In 1994
and 1995 the Company made technological  advances which allowed it to market its
products to the neurological and oncological markets.  Neurological applications
of POSICAM(TM)  systems include  diagnoses of certain brain  disorders,  such as
epileptic seizures,  dementia,  stroke,  Alzheimer's disease, Pick's disease and
Parkinson's disease. In oncology,  POSICAM(TM) systems are used in the diagnosis
and  evaluation of tumors of the bone and various organs and tissues such as the
brain, liver, colon and breast.

                                        3
<PAGE>
Medical Imaging Industry Overview

         Diagnostic  imaging  allows a physician  to assess  disease,  trauma or
dysfunction  without the necessity of surgery.  The diagnostic  imaging industry
includes ultrasound, X-ray, MRI, CAT scans, and nuclear medicine (which includes
PET technology and single-photon  emission computed tomography  ("SPECT")).  MRI
technology uses

powerful  magnetic  fields to provide  anatomical and  structural  images of the
brain, the spine and other soft tissues, as well as determining the location and
size of tumors.  CAT scans use X-ray beams to obtain  anatomical  and structural
images of bones and organs.  Nuclear medicine  focuses on providing  information
about the function and  biological  processes of organs and tissues  through the
use of radiopharmaceuticals.

         The first  prototype PET scanner was developed in the mid 1970s and the
first  commercial  PET scanner was  constructed  in 1978.  Approximately  70 PET
systems are currently operational in the United States and approximately 100 PET
systems are in  commercial  use  internationally.  Of the PET systems  currently
operational in the United States, 15 systems were sold by the Company.

PET Technology

         The   PET   imaging   process   begins   with   the   injection   of  a
radiopharmaceutical (a drug containing a radioactive agent) by a trained medical
person into a patient's bloodstream. The injected radiopharmaceutical  undergoes
a process of radioactive decay, whereby positrons (positively charged electrons)
are converted into light energy,  or photons.  These photons are detected by the
POSICAM(TM)   systems.   The  source  of  the  photons  is  determined   and  is
reconstructed  into a color image of the  scanned  organ  utilizing  proprietary
computer  software.  Since  the  concentration  of  the  radiopharmaceutical  is
determined  by certain  functional  processes in the organ,  such as blood flow,
metabolism or other biochemical processes, the brightness or color at each point
in the PET image directly maps the vitality of the  respective  function at that
point within the organ.

         PET  imaging  is an  accurate  non-invasive  method  of  diagnosing  or
assessing  the  severity  of  coronary  artery  disease.  Unlike  other  imaging
technologies,  PET technology allows a physician to determine whether blood flow
to the heart muscle is normal,  thereby identifying  narrowed coronary arteries,
and whether  damaged heart muscle is viable and may benefit from  treatment such
as bypass surgery or angioplasty.

         In neurology, PET imaging is now being used as a surgical planning tool
to locate the source of epileptic  disturbances in patients with  uncontrollable
seizures.  In other neurological  applications,  PET is used in the diagnosis of
dementia, Alzheimer's disease, Pick's disease and Parkinson's disease and in the
evaluation of stroke severity.

         In oncology, PET imaging is currently used to measure the metabolism of
tumor masses after surgery or  chemotherapy.  Clinical  experience has shown the
PET is more accurate than CAT scans or MRI in determining the  effectiveness  of
chemotherapy and  radiotherapy in the treatment of cancer.  Scans used to assess
suspected breast cancer are still in the experimental  stage.  Whole body scans,
however, are now performed with PET to survey the body for cancer.

         The  radiopharmaceuticals  (together  with the  radioactive  substances
contained therein) employed in PET scanning are used by the organ in its natural
processes  (such as blood  flow and  metabolism)  without  affecting  its normal
function, and quickly dissipates from the body. Radiopharmaceuticals used in PET
procedures  expose patients to a certain amount of radiation,  which exposure is
measured in units of rads.  Exposure  to  radiation  can cause  damage to living
tissue,  and the greater the  radiation  exposure the greater the  potential for
damage.  Certain PET procedures expose a patient to less radiation than would be
associated  with other  imaging  technologies.  A PET  cardiac  scan,  using the
radiopharmaceutical  Rubidium-82 results in exposure of approximately 0.096 rad,
while a neurology  PET scan  results in exposure of  approximately  0.39 rad. In
contrast,  a typical chest X-ray results in exposure of  approximately  0.15 rad
and a CAT scan results in exposure to between approximately 0.5 rad and 4.0 rad,
depending on the procedure.

                                        4
<PAGE>
         Radiopharmaceuticals  used in PET  technology  can be created from many
natural  substances  including carbon,  oxygen,  nitrogen and fluorine.  The PET
procedure  to  be  performed   determines   the  type  of   radiopharmaceutical.
Radiopharmaceuticals  are made ready for use at a clinic or hospital by either a
cyclotron or generator.  Cyclotrons  require an initial capital  investment in a
range up to $2 million, additional capital investment for site preparation,  and
significant annual operating  expenses.  A generator requires an initial capital
investment of approximately  $50,000,  no additional capital investment for site
preparation,  and monthly  operating  expenses of approximately  $25,000.  While
POSICAM(TM)  systems  have been  designed  to be used with  both  cyclotron  and
generator processed radiopharmaceuticals,  they have proprietary design features
which enhance their  ability to use  generator  processed  radiopharmaceuticals,
thereby  allowing a clinic or hospital which intends to focus on certain cardiac
PET  applications  to avoid  the  significant  capital  and  operating  expenses
associated with a cyclotron.

Marketing Strategy

         The Company  initially  targeted  clinical  cardiology as its marketing
strategy  based on research  conducted at the University of Texas Health Science
Center in Houston,  Texas which  showed the  commercial  potential  of clinician
cardiology applications of PET imaging.

         The Company  relies on referrals  from users of the Company's  existing
base of installed scanners,  clinical presentations at professional  conferences
by customers of the Company,  and published articles in trade journals to market
its systems.

THE POSICAM(TM)  System

         At the heart of the POSICAM(TM)  system is its detector  assembly which
detects positron  emissions and electronic  circuits which pinpoint the location
of those  positron  emissions.  POSICAM(TM)  systems are easy to use and are not
physically  confirming  thereby not intimidating to patients.  POSICAM(TM) scans
are commonly performed on an outpatient basis.

         The Company's  POSICAM(TM)  systems compare  favorably with PET systems
produced by other  manufacturers  based upon count rate and  sensitivity.  Count
rate and  sensitivity  of an imaging  system  determines  its ability to detect,
register and  assimilate  the greatest  number of meaningful  positron  emission
events in the shortest  period of time. The favorable count rate and sensitivity
of the POSICAM(TM)  systems  results in good diagnostic  accuracy as measured by
fewer false positives and false  negatives.  Further benefits of high count rate
and  sensitivity  include faster imaging and the ability to use short  half-life
radiopharmaceuticals,   thereby  reducing  patient  exposure  to  radiation  and
potentially reducing the capital cost to some purchasers through the elimination
of the need for a cyclotron for certain cardiac applications.

         The detector assembly consists of crystals, which scintillate (give off
light) when exposed to positron emissions,  and photomultiplier tubes, which are
coupled to the crystals and convert the scintillations into electrical impulses.
The Company  employs its own  patented  staggered  crystal  array design for the
POSICAM(TM)   detectors  which  unlike   competing  PET  systems,   permits  the
configuration  of the  detector  crystals  into  overlapping  series to create a
higher  quality  image by  eliminating  image  sampling  gaps.  This  feature is
important  since  under-sampling  or  gaps  in  sampling  can  contribute  to an
inaccurate  diagnosis.  The crystal  array design also reduces  "dead time" (the
time interval  following the detection and  registering  of a positron  emission
during which a subsequent even cannot be detected).

         The  POSICAM(TM)  system  creates a high number of finely  spaced image
slices  in.  An  image  slice  is a cross-  sectional  view  that is taken at an
arbitrary  angle to the angle of the organ being scanned and is not  necessarily
the angle,  which a physician wishes to view. The POSICAM(TM)  computer can then
adjust the cross-sectional  view to create an image from any designed angle. The
high number of finely  spaced image  slices  created by the  POSICAM(TM)  system
enhances the accuracy of the created image.

                                        5
<PAGE>
         An  integral  part of a  POSICAM(TM)  system  is its  proprietary  data
acquisition  microprocessor and its application  system software.  The Company's
software  can  reconstruct  an image in five  seconds or less.  The  Company has
expended  substantial  effort and resources to develop the computer  software to
insure that it is  user-friendly  and  clinically  oriented.  The only personnel
needed to perform  clinical  studies with the POSICAM(TM)  systems are a trained
nurse, a trained  technician and an overseeing  physician for patient management
and safety.

         POSICAM(TM)  HZ and HZL. In addition to the basic  POSICAM(TM)  system,
the Company offers two advanced  versions of its basic system which are known as
the POSICAM(TM) HZ and the POSICAM(TM) HZL. Oncologists and neurologists require
enhanced  resolution  and a large  field  of view to  detect  small  tumors  and
otherwise  scan large  organs,  such as the liver.  The  POSICAM(TM)  HZ and HZL
employ new detector  concepts to satisfy these needs while  maintaining the high
count  rate  sensitivity  of the basic  POSICAM(TM).  In May 1991,  the  Company
received approval from the FDA to market the POSICAM(TM) HZ and in May 1993, the
Company received a patent for the innovative light guide and detector staggering
concepts used in the  POSICAM(TM) HZ and HZL. In July 1993 the Company  received
FDA approval to market in the United States the  POSICAM(TM)  HZL,  which has an
even  larger  field of view than the  POSICAM(TM)  HZ  facilitating  whole  body
scanning and the scanning of large organs. As the market for PET systems matures
and price  sensitivity  among  purchasers  increases,  the Company believes that
interest in the POSICAM(TM) HZ, which costs less than the POSICAM(TM)  HZL, will
increase. The Company also believes that the special features of the POSICAM(TM)
HZL enhance its usefulness in oncology and neurology applications.

Customer Service and Warranty

         The Company has five (5) field service  engineers in the United States,
who have primary  responsibility  for supporting and  maintaining  the Company's
installed equipment base. In addition,  the Company has field engineers involved
in site  planning,  customer  training,  sales of hardware  upgrades,  sales and
administration of service  contracts,  telephone  technical support and customer
service.

         The company  typically  provides  one-year  warranties to purchasers of
POSICAM(TM)  systems.  However,  in the past,  the  Company  offered  multi-year
warranties to facilitate  sales of its systems.  Following the warranty  period,
the Company offers  purchasers a comprehensive  service contract under which the
Company  provides all parts and labor,  system  software  upgrades and unlimited
service calls. The Company currently  provides service to all of its POSICAM(TM)
systems,  ten (10) of which are under formal service  contracts.  One (1) of the
service contracts is automatically renewed on a month-to-month basis and one (1)
automatically renews on a year-to-year basis. Of the remaining eight (8) service
contracts,  four (4) expire during 1998,  one (1) expires in 1999, two expire in
2000 and one (1) expires in 2001. The Company is currently negotiating to extend
all of the service  contracts,  which expire in 1998;  however,  there can be no
assurances that such extension will be obtained.

         The  Company's  service  goal is to  maintain  maximum  system  uptime.
Success of a clinical site is largely  dependent on patient volume during normal
working hours and therefore  equipment uptime and reliability are key factors in
this  success.  Records  compiled by the Company show an average  uptime for all
installed POSICAM(TM) systems during 1997 and 1996 of greater than 95%.

Competition

         The  Company   faces   competition   from  two  (2)  other   commercial
manufacturers  of Pet systems  and from other  imaging  technologies,  primarily
SPECT  and MRI.  The  Company  does not  believe  that MRI and CAT scan  imaging
represent significant competing technologies. The Company views MRI and CAT scan
imaging to be complementary  technologies to PET, in that PET, MRI and CAT scans
each provide information not available from the other.

                                        6
<PAGE>
         The Company's primary competition from commercial  manufacturers of PET
systems comes from General  Electric Company ("GE") and Siemens Medical Systems,
Inc. ("Siemens") (in a joint venture with CTI, Inc. of Knoxville, Tennessee). GE
and Siemens have substantially  greater  financial,  technological and personnel
resources  than  the  Company.   See  "Item  1.  Description  of  Business--Risk
Associated  with  Business  Activities--Substantial  Competition  and Effects of
Technological  Change  and  General  Electric  Transaction".  In  addition,  two
Japanese  manufacturers,  Hitachi and Shimadzu,  have  manufactured and sold PET
scanners in Japan but not in the United States.

         The primary  competing  technology in the nuclear medicine  industry is
SPECT.  The  Company  believes  that the  primary  reason  that  SPECT  competes
successfully with PET is the lower cost of the SPECT systems. A SPECT system can
cost  between  $175,000  and  $750,000  as  compared  with  up to  $2.0  million
(depending on  configuration  and equipment  options) for a POSICAM(TM)  system.
However,  the Company believes its POSICAM(TM)  systems are a better  diagnostic
tool in that the Company's  systems are able to create more accurate images than
SPECT imaging.  Unlike SPECT,  the radioactive  substances used by the Company's
systems are based on naturally  occurring  substances  within the body and allow
the POSICAM(TM)  systems to directly measure the metabolic processes and changes
occurring within the scanned organ, thus providing a more accurate image.

         High  field MRI  technology,  an  advanced  version  of MRI,  is in the
development stage, but is a potential competitor to PET in certain neurology and
oncology  applications.  Presently,  high field MRI may be useful in  performing
certain  research  (non-clinical)  applications  such as blood  flow  studies to
perform "brain  mapping" to localize the portions of the brain  associated  with
individual functions (such as motor activities and vision).  However, high field
MRI does not have the  capability  to  assess  metabolism.  The  Company  cannot
presently predict the future competitiveness of high field MRI.

         Several  manufacturers  of SPECT  systems are now  offering  multi-head
systems,  which have been modified to operate in coincidence mode,  similar to a
PET scanner.  These systems achieve spatial  resolutions  similar to that of PET
scanners, but their sensitivity and count rate are only a small fraction of that
achieved by true PET scanners,  making the images  "noisy" and more difficult to
interpret. The Company believes these systems are useful for only a very limited
class of clinical PET studies using only the FDG radiotracer. In addition, SPECT
coincidence systems offer limited,  if any,  corrections for patient attenuation
and scatter, which affects the accuracy of diagnosis.

Third-Party Reimbursement

         POSICAM(TM)  systems  are  purchased  or leased  primarily  by  medical
institutions,  which  provide  health  care  services  to their  patients.  Such
institutions  or patients  typically  bill or seek  reimbursement  from  various
third-party payors such as Medicare,  Medicaid,  other governmental programs and
private  insurance  carriers  for  the  charges  associated  with  the  provided
healthcare services. The Company believes that the market success of PET imaging
depends largely upon obtaining  favorable  coverage and  reimbursement  policies
from such programs and carriers.

         Medicare/Medicaid  reimbursement.  Prior to March  1995,  Medicare  and
Medicaid did not provide reimbursement for certain PET imaging.  Decisions as to
such policies for major new medical  procedures  are typically  Made by the U.S.
Health Care Financing  Administration ("HCFA"), based in part on recommendations
made to it by the Office of Health Technology Assessment ("OHTA").  Historically
OHTA has not completed an  evaluation  of a procedure  unless all of the devices
and/or drugs used in the  procedure  have  received  approval or  clearance  for
marketing  by the FDA.  Decisions  as to the  extent of  Medicaid  coverage  for
particular  technologies  are made  separately  by the  various  state  Medicaid
programs,  but such programs tend to follow Medicare national coverage policies.
Medicare and Medicaid  reimbursement  for PET imaging have been, and the Company
believes  will  continue to be, very  restrictive.  The  Company  believes  that
restrictive reimbursement policies have had a very significant adverse affect on
widespread  use of PET  imaging  and have,  therefore,  adversely  affected  the
Company's business, financial condition, results of operations and cash flows.

                                        7
<PAGE>
         Private  insurer  reimbursement.   Most  insurance  carriers  currently
consider PET imaging to be an investigational procedure and do not reimburse for
procedures  involving PET imaging.  The Company  believes  that certain  private
insurance  carriers,  while they do not have broad Pet  reimbursement  policies,
reimburse for PET scans on a case-by-case basis.

         If third-party coverage for PET procedures using the POSICAM(TM) system
remains  unavailable,  it will  likely  have a  material  adverse  effect on the
Company's business, financial condition, results of operations and cash flows.

Manufacturing

         The Company  believes that it currently has the ability to assemble its
POSICAM(TM)  scanners  in a 2,700  square  foot  area of its 5,400  square  foot
corporate facility located in Houston, Texas. Scanners are generally produced by
assembling  parts  furnished  to the Company by outside  suppliers.  The Company
believes that it can assemble a typical POSICAM(TM) system in two months with an
additional  month  required for testing  before  delivery.  Due to the Company's
current financial  condition,  the Company  relocated its manufacturing  area in
April 1998 and the Company has not yet produced any  POSICAM(TM)  systems at its
present facility.

         An essential component of the Company's  POSICAM(TM) systems is bismuth
germinate oxide ("BGO") crystals which detect the positron emissions forming the
basis for a PET image, and photomultiplier tubes, which convert the light energy
emitted  by  such  crystals  into  electrical  impulses  for  use in  the  image
reconstruction   process.  BGO  crystals  are  specially  manufactured  and  are
available from a supplier located in the United States,  that is a subsidiary of
a Japanese  company and another  supplier  located in France.  While the Company
primarily  relies on a single  source for its BGO  crystals,  it has in the past
purchased  crystals  from the second  manufacturer  and  believes  that it could
resume such  purchases at acceptable  prices  without  significant  delays.  The
Company  purchases  photomultiplier  tubes from a French supplier.  In the event
that the  supply of French  photomultiplier  tubes were to be  interrupted,  the
Company  believes it has the ability to source similar product from an alternate
manufacturer  in the United States.  The Company  believes that multiple  vendor
sources exist in the United States for all other parts,  for which no individual
vendor  is  critical  to  production.  However,  due  to the  Company's  current
financial  condition,  many of its suppliers are requiring advanced payments for
materials.

Research and Development

          The Company's  POSICAM systems are based upon  proprietary  technology
initially  developed at the University of Texas Health Science Center  ("UTHSC")
in Houston,  Texas under a $24 million research program begun in 1979 and funded
by UTHSC and The Clayton Foundation for Research (the "Clayton  Foundation"),  a
Houston-  based,  non-profit  organization.   Further  product  development  and
commercialization of the system has been funded by the Company.

          The Company's  research and  development  expenses for the years ended
December 31, 1997 and 1996 were  $1,305,000  and  $2,227,000,  respectively.  In
addition  to  the  Company's  sponsored  and  funded  research  and  development
programs,  the Company in the past has supplemented its research and development
with a technology  transfer  agreement with UTHSC and currently is participating
in  a  collaborative  research  efforts  with  selected  clinical  and  research
customers,  and research  grants funded through the federal  government's  Small
Business Innovative Research ("SBIR') program.

                                        8
<PAGE>
Patent and Royalty Arrangements

          The  Company  acquired  the  know-how  and patent  rights or  positron
imaging (the "Licensed Technology") from the Clayton Foundation,  K. Lance Gould
(a director of the  Company)  and Nizar A.  Mullani  (formerly a 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, 1% each to the Clayton Foundation, K. Lance Gould and to Nizar A.
Mullani.

         The Company's  current 3% royalty is based on agreements  with Nizar A.
Mullani  and K. Lance Gould 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,  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.

         Two of the Company's patents,  issued in January 1986 and February 1987
and  expiring in January  2003 and February  2004,  respectively,  relate to the
staggered  crystal array design of its POSICAM  systems.  One additional  patent
issued in June 1987 and expiring in June 2004 relates to  technology,  which the
company,  by  obtaining  the patent,  has reserved the right to use. The Company
maintains  certain of its patents in Germany and has applied for certain patents
in Japan.

         The Company seeks to protect its trade secrets and proprietary know how
through  confidentiality  agreements  with its  employees and  consultants.  The
Company  requires each employee and  consultant to enter into a  confidentiality
agreement  containing  provisions  prohibiting  the  disclosure of  confidential
information  to anyone  outside the Company,  and  requiring  disclosure  to the
Company of any ideas,  developments,  discoveries  or  investigations  conceived
during  employment or service as a consultant  and the assignment to the Company
of patents and  proprietary  rights to such matters  related to the business and
technology of the Company.

Government Regulations

         The  Company's  POSICAM(TM)  systems and  radiopharmaceuticals  used in
connection with them are subject to regulation by the FDA. The FDA regulates and
approves  the  clinical  testing,  manufacturing,   labeling,  distribution  and
promotion   of   medical   devices  in  the   United   States   prior  to  their
commercialization. In addition, various foreign countries in which the Company's
products are or may be marketed, impose certain regulatory requirements.

         The Company's  POSICAM(TM)  systems are regulated as medical devices by
the FDA and require  pre-market  clearance  by the FDA.  Pursuant to the Medical
Device Amendments of May 1976, the FDA classifies  medical devices in commercial
distribution  as a class I, class II, or class III device.  This  classification
scheme is based on the controls  necessary to  reasonably  ensure the safety and
effectiveness  of the medical  devices.  Class I devices are those devices whose
safety and  effectiveness  can reasonably be ensured through  general  controls,
such as adequate  labeling,  premarket  notification  and  adherence to the Good
Manufacturing  Practice ("GMP") regulations.  Class II devices are those devices
whose safety and  effectiveness  can  reasonably  be assured  through the use of
special  controls,  such as  performance  standards,  post market  surveillance,
patient  registries  and FDA  guidelines.  Class III devices  require  premarket
approval from the FDA and are generally devices,  which support or sustain human
life or present a potential risk of illness or injury.  The POSICAM(TM)  systems
are considered to be class II devices. However, as of June 30, 1998, the FDA has
not promulgated a performance standard for PET systems.  Therefore,  POSICAM(TM)
systems are not currently subject to such controls, nor are they subject to post
market surveillance, patient registries and FDA guides.

                                       9
<PAGE>
         Before  it can be  commercially  marketed  a class  II  device  must be
approved  by the FDA. If a medical  device is  "substantially  equivalent"  to a
legally  marketed class II device,  the manufacturer or distributor may seek FDA
clearance by filing what is known as a 510(k) pre-market notification which must
be supported by data and test results.  If the FDA determines that the device is
substantially equivalent,  then it may be marketed in the United States. The FDA
may,  however,  require  additional  data or  additional  test  results,  or may
determine  that  a  device  is  "not  substantially  equivalent."  Requests  for
additional   date  or  test   results  or  a  "not   substantially   equivalent"
determination  could delay the Company's market introduction of new products and
could have a material  adverse  effect on the  Company's  financial  results and
operations.   The  FDA  is  not   required  to  respond  to  510(k)   pre-market
notifications  within a specific time period. The FDA recently began requiring a
more rigorous  demonstration  of substantial  equivalence  and in many cases the
time periods required for product approvals has increased. If the FDA determines
that a new product is "not substantially equivalent," then the manufacturer must
undergo  a lengthy  Pre-Marketing  Approval  process  which  generally  involves
clinical trials and submission of data to prove safety and effectiveness  before
approval is granted.

         The Company's original  POSICAM(TM) system received 510(k) clearance in
September 1985. In November 1989, the Company was granted 510(k) clearance for a
modified  POSICAM(TM)  system,  and also  received  approval  for a  mobile  van
configuration. In 1991, the Company applied for and received 510(k) clearance of
its POSICAM(TM) HZ system, and in July 1993 the Company received 510(k) approval
for the POSICAM(TM) HZL.

         The  Company  is  also  required  to  register  as  a  medical   device
manufacturer  with the FDA. As such,  the Company may be inspected  from time to
time by the FDA for compliance with the FDA's GMP regulations. These regulations
require that the Company  manufacture its products and maintain its documents in
a  prescribed  manner  with  respect  to  manufacturing,   testing  and  control
activities. Further, the Company is required to comply with various FDA labeling
requirements.  The Medical Device Reporting regulation required that the Company
provide  information  to the FDA on deaths or serious  injuries  alleged to have
been  associated  with the use of its devices,  as well as product  malfunctions
that  would  likely  cause  or  contribute  to death or  serious  injury  if the
malfunction  were to  recur.  To  date,  no such  deaths,  injuries  or  product
malfunctions  have occurred.  In addition,  the FDA prohibits an approved device
from being  marketed for  unapproved  applications.  To date the Company has not
received any notices of noncompliance from the FDA concerning GMP regulations.

          During February 1995, the FDA conducted a GMP compliance inspection at
the Company's  manufacturing  facility that resulted in the Company receiving an
FDA warning  letter.  Several  issues were noted for  corrective  action in that
letter and the Company  expeditiously took action to address the FDA's concerns.
In  February  1996,  the  FDA  began a  follow-up  inspection  of the  Company's
corrective  actions.  In  February  1996,  February  1997 and July  1998 the FDA
conducted  follow-up  inspections  of the Company's  facilities.  As of June 30,
1998,  the  Company  has not been  informed  of the  results  of such  follow-up
inspections.   If  the  FDA  finds  that  the  Company  has  not  corrected  the
deficiencies  noted in the warning  letter it could,  among other things,  issue
another warning letter, prohibit new product introductions,  institute a product
recall or prohibit the Company from shipping products until all deficiencies are
corrected  to the FDA's  satisfaction.  The  Company  is  cooperating  fully and
intends to continue to work with the FDA in all compliance matters.

          The  Company is required  under  Texas law to register  with the Texas
Department   of   Health   with   respect   to   the    Company's    maintaining
radiopharmaceuticals  on premises for testing and for  research and  development
purposes.  The Texas  Department  of Health has the  authority  to  inspect  the
Company's  records and facilities to ensure  compliance with these  regulations.
The Company has in the past received notice of minor violations, which have been
satisfactorily  resolved  with no punitive  action.  The Company  believes  that
adequate measures have been taken to prevent their recurrence.

                                       10
<PAGE>
          Sales of medical  devices  outside of the United States may be subject
to foreign regulatory requirements that vary widely from country to country. The
time  required to obtain  approval by a foreign  country may be longer than that
required for FDA approval and the requirements may differ.

         PET imaging centers must comply with regulations  promulgated,  in most
states, by an agency of the state government,  under authority  delegated by the
Nuclear   Regulatory   Commission   governing   the   possession   and   use  of
radiopharmaceuticals  for  medical  diagnostic  procedure.  In order  to  secure
approval,  a PET imaging center must submit an acceptable  site for its scanner,
employ adequate radiation safety and quality  procedures,  and provide a nuclear
physician who meets certain  training and experience  standards.  Cyclotrons are
considered  industrial  devices  and  are  therefore  not  covered  by  any  FDA
regulations. Currently, there are no state or federal regulations concerning the
sale, marketing, or ownership of cyclotrons.  However,  operational licenses are
required  by  state  radiation  regulatory   divisions.   The  licensing  and/or
registration  of  cyclotrons  by a state is  typically  handled  by the  state's
Department of Health or Bureau of Radiation Control.

         Many states  have  "certificate  of need"  regulations  that  require a
purchaser  or user of  expensive  diagnostic  equipment  such as PET  systems to
obtain regulatory approval before it may purchase and install such equipment.  A
primary  purpose of these  regulations is to contain health costs by restricting
the number of similar  units in a  particular  locality.  The Company has yet to
experience  a situation  where a customer  was unable to obtain  such  approval.
However,  restrictions  of this mature may  increase  in the future  through the
passage of  legislation  and the  adoption  of  regulatory  changes as a part of
overall health care reform.

Backlog

         The Company had no backlog for its POSICAM(TM) systems at June 30, 1998
or December 31, 1997.

Product Liability and Insurance

         Medical device companies are subject to a risk of product liability and
other  liability  claims in the event that the use of their products  results in
personal injury claims.  The Company has not  experienced any product  liability
claims to date. The Company  maintains  liability  insurance with coverage of $2
million per occurrence and an annual aggregate maximum of $3 million.

Employees

         As of June 30, 1998, the Company  employed ten (10) full-time  persons,
two (2) are employed in the Company's engineering department,  five (5) in field
service,   two  (2)  in   manufacturing   and  one  (1)  in  the  executive  and
administration department.

         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
Company's Board of Directors,  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. Dr.
Haas has demanded that the Company pay to 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  Company's  Board of  Directors.  The
Company has  indicated to Dr. Haas that it believes no amounts are due him under
his employment agreement.  As of June 30, 1998, the Company is unable to predict
the outcome of the disagreement between Dr. Haas and the Company.

                                       11
<PAGE>
         Gary B. Wood,  Ph.D.,  currently  Chairman  of the  company's  Board of
Directors, has assumed the duties of President and Chief Executive Officer until
selection of a replacement for Dr. Haas.

Risks Associated with Business Activities

         Potential  Default Under Pro Futures Loan. The Pro Futures Loan matures
on December 5, 1998 and, at that time,  approximately $400,000 will be due under
the Pro  Futures  Loan.  Unless the  maturity  date of the Pro  Futures  Loan is
extended or the Company is  successful  in obtaining  additional  debt or equity
financing in an amount  necessary to discharge the Pro Futures Loan prior to its
maturity,  the Company will be unable to pay when due the Pro Futures Loan and a
payment default  thereunder will occur. The Pro Futures Loan is secured 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.  Upon
a payment default under the Pro Futures Loan, the Company  anticipates  that the
lender  thereunder  will  seek to  foreclose  its liens  and  security  interest
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
POSICAMTM  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 Pro  Futures  Loan.  Absent  obtaining a further  extension  of the
December 5, 1998  maturity  date of the Pro Futures  Loan,  closing the proposed
sale of the POSICAMTM system,  or obtaining  additional debt or equity financing
necessary to repay the Pro Futures 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 ever
achieve  the  level of  revenues  needed  to be  profitable  in the  future,  if
profitability is achieved,  that it will be sustained.  Due to the sizable 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, operating results and cash flows
could be adversely affected.

                                       12
<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.

         Assuming  that the Company is  successful  in obtaining an extension of
the October 5, 1998 maturity date of the Pro Futures Loan or the additional debt
or equity  financing  necessary to repay the Pro Futures Loan,  the Company will
also  require  additional  debt or equity  financing  to sustain its  operations
beyond the fourth quarter of 1998. The Company  currently is unable to seek such
additional  debt or equity  financing  and,  unless the  closing of the  Imatron
Transaction  occurs,  it is unlikely  that the  Company  will be able to seek to
obtain such  financing.  In the event that the Imatron  Transaction  (see below)
closes, the Company intends to rely upon Imatron's  undertaking (to use its best
efforts to arrange  additional  third party equity financing for the Company) in
order to fulfill its current  financing needs.  There are no assurances that the
closing of the Imatron  Transaction  will occur, or if the closing occurs,  that
Imatron will be successful in arranging  additional third party equity financing
for the Company or, if such equity financing is obtained, that the terms of such
equity financing will be favorable to the Company or its securityholders.

         As a result of the Company's  liquidity  problems,  its auditors,  Ham,
Langston & Brezina, L.L.P., have added an emphasis paragraph to their opinion on
the Company's  financial  statements  indicating that  substantial  doubt exists
about the Company's ability to continue as a going concern.

         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  anticipates that it will hold a special meeting of its
shareholders at which time it will seek approval of the Imatron  Transaction and
approval of an increase in the number of authorized common shares;  however,  no
assurances  can be given  that such  additional  shares  will be  authorized  in
adequate time to allow the Company to issue such equity securities.

         Imatron Transaction. In May 1998, the Company entered into an agreement
(the   "Imatron   Transaction")   with  Imatron  Inc.  of  South  San  Francisco
("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 Positron up to $500,000 in order to enable
it to meet a  portion  of its  current  obligations.  As of June 30,  1998,  the
Company had borrowed  $468,000.  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 Positron'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 Positron would have been obligated to issue at
least  9,000,000  shares of common  stock.  Positron will receive a nominal cash
amount from  Imatron in payment for the shares.  Under the planned  arrangement,
Positron will remain an independent public company.

         Imatron,  in addition to providing  limited working capital  financing,
has agreed to support Positron's  marketing program  particularly with regard to
Imatron's  affiliate,  Imatron Japan,  Inc. by agreeing to take, after the share
issuance  closing  date,  all  reasonable  efforts to cause the  placement of 10
POSICAM(TM)  systems  over the next three  years.  Positron  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

                                       13
<PAGE>
Imatron,  Inc. is a major  distributor  for  Imatron's  Ultrafast CT and several
other high tech companies. Imatron has a 24 percent minority interest in Imatron
Japan.  Imatron  has also  agreed to 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 Positron 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  Positron,  (b) the
resignation of at least three of the four Positron directors and the appointment
of  Imatron's  nominees to fill such  vacancies,  and (c)  Positron  shareholder
approval of an amendment to Positron's Articles of Incorporation to increase its
authorized common stock to at least  100,000,000  shares.  Positron  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,  Positron,  Imatron and two
current lenders to Positron,  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 current
balance of  approximately  $845,000) to October 5, 1998, in return for a $50,000
payment,  the  issuance of warrants  to  purchase  1,150,000  shares of Positron
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 Positron
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 and $100,000 for each of
the months of August and September  1998, (b) Imatron agreed to subordinate  its
loan to ProFutures'  loan,  (c) Uro-Tech,  Ltd.  agreed to subordinate  its loan
(with a current balance of approximately  $767,000 plus accrued interest payable
of  approximately  $260,000  at  June  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 Positron's debt to both ProFutures and Imatron.

         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 may be unable to
continue as a going concern and that the  Company's  assets may be seized by its
secured creditors.

         NASDAQ  SmallCap  Market   Eligibility   Failure  to  Meet  Maintenance
Requirements:  Delisting of Securities  from the NASDAQ  Systems.  The Company's
Common Stock was previously  listed on the NASDAQ SmallCap Market.  The Board of
Governors of the National  Association of Securities Dealers,  Inc. (the "NASD")
has established certain standards for the continued listing of a security 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 December 31, 1997, the Company had a total
capital and surplus  deficit of  $5,113,000.  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  increase  sales of its  POSICAM(TM)
systems.  There can be no assurances 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  Company's  Common Stock is currently  conducted in the
"pink sheets" or the NASD's  Electronic  Bulletin  Board.  Trading in the Common
Stock is covered by rules  promulgated under the Exchange Act 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 Company's  Common
Stock was $0.41.

                                       14
<PAGE>
         The SEC has adopted  regulations that generally define a penny stock to
be any  equity  security  that has a market  price of less than $5.00 per share,
subject to certain  exceptions.  The Company's common stock is currently subject
to such penny stock rules.  The regulations  require the delivery,  prior to any
transaction  involving a penny stock,  of a disclosure  schedule  explaining the
penny stock market and the risks  associated  therewith.  As a penny stock,  the
market liquidity for the Company's Common Stock is severely  affected due to the
limitations  placed on  broker/dealers  that sell the Common Stock in the public
market.

          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 its 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 infringes
on patents  held by the  Company,  it would be costly for the Company to enforce
its rights and the  enforcement  of its rights would divert funds and  resources
from the Company's operations.  Furthermore,  there can be no assurance that the
Company's products will not infringe on any patents of others.

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

         Government  Regulation.  The  Company's  POSICAM(TM)  systems  and  the
radiopharmaceuticals  used in connection  with them are subject to regulation by
the FDA. The FDA regulates and must approve the clinical testing, manufacturing,
labeling,  distribution,  and promotion of medical devices in the United States.
There can be no assurance  that any additional  product or enhancement  that the
Company may develop will be approved by the FDA. Delays in receiving  regulatory
approval  could have a material  adverse  effect on the Company's  business.  In
addition,  various foreign countries in which the Company's  products are or may
be marketed impose additional  regulatory  requirements.  Further, the Company's
operations  and the  operations of PET systems are subject to  regulation  under
federal and state health safety laws,  and  purchasers  and users of PET systems
are subject to federal and state laws and regulations  regarding the purchase of
medical equipment such as PET systems. All laws and regulations, including those

                                       15
<PAGE>
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  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.  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  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.


Item 2.  Description of Property

         The Company  occupies a 5,400 square foot  facility in Houston,  Texas.
That facility includes area for system assembly and testing, a computer room for
hardware and software  product design,  and office space. The facility is leased
through  September 30, 1998, at a lease rate of approximately  $2,700 per month.
The Company  estimates  the space to be  sufficient  for the period  through the
expiration of its current lease.


Item 3.  Legal Proceedings

         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.

         Nizar A.  Mullani  and K. Lance Gould  previously  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

                                       16
<PAGE>
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
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.


Item 4.  Submission of Matters to a Vote of Security Holders

         No matters were submitted to a vote of the Company's  security  holders
during the fourth quarter of the Company's fiscal year.


                                       17
<PAGE>
                                     PART II

Item 5.  Market for Common Equity and Related Stockholder 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 (the "Initial Public Offering").
Prior to the Initial  Public  Offering  there was no public market for Company's
Common Stock. The Company's  Common Stock and Redeemable  Warrants are currently
traded in the  over-the-counter  securities market, and quoted on the NASDAQ OTC
Bulletin  Board under the symbols POSI and POSIW,  respectively.  The  Company's
Common  Stock and  Redeemable  Warrants  were  previously  traded on the  NASDAQ
SmallCap  Market but were  delisted  in 1997  because  the Company was unable to
comply  with  various  financial  and  compliance   requirements  for  continued
inclusion on the NASDAQ SmallCap Market.  See "Item 1. Description of Business -
Risks Associated with Business Activities."

         The following sets forth the range of the high and low reported closing
sales  prices for the  Company's  Common  Stock for the first three  quarters of
1998,  through  August 17, 1998,  and for each quarter in 1997 and 1996,  all as
reported on the NASDAQ OTC Bulletin Board or the NASDAQ SmallCap Market.

                          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        --       --         0.953    0.172        3.250    1.500

  * Through August 17, 1998

         There  were  approximately  220  holders  or record of shares of Common
Stock as of June 30, 1998, including  broker-dealers holding shares beneficially
owned by their customers .

         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.  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.

Item 6.  Management's Discussion and Analysis or 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
operations.

         Imatron Transaction.  In May 1998, the Company entered into the Imatron
Transaction with Imatron,  whereby Imatron will acquire a majority  ownership of
the Company. In conjunction with the execution of definitive agreements, Imatron

                                       18
<PAGE>
began  making  working  capital  advances  available  to Positron 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
approximately  $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 Positron'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 Positron would have been obligated to issue at
least  9,000,000  shares of common  stock.  Positron will receive a nominal cash
acquisition price from Imatron in payment for the shares.

         Imatron,  in addition to providing  limited working capital  financing,
has agreed to support Positron's  marketing program  particularly with regard to
Imatron's  affiliate,  Imatron Japan,  Inc. by agreeing to take, after the share
issuance  closing  date,  all  reasonable  efforts to cause the  placement of 10
POSICAM(TM)  systems  over the next three  years.  Positron  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 the products
of several other high tech companies. Imatron has a 24 percent minority interest
in  Imatron   Japan.   Imatron   has  also   agreed  to  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  Positron  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  Positron,  (b) the
resignation of at least three of the four Positron directors and the appointment
of  Imatron's  nominees to fill such  vacancies,  and (c)  Positron  shareholder
approval of an amendment to Positron's Articles of Incorporation to increase its
authorized  common  stock to [at  least]  100,000,000  shares of  common  stock.
Positron  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,  Positron,  Imatron and two
current lenders to Positron, Uro-Tech, Ltd. and ProFutures, entered into certain
agreements  whereby (a)  ProFutures  waived all past  defaults  and extended the
maturity  of its loan  (with a current  balance  of  approximately  $570,000  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 Positron  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 Positron  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 current 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  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.  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 POSICAMTM  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

                                       19
<PAGE>
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 POSICAMTM  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 may be unable to
continue as a going concern and that the  Company's  assets may be seized by its
secured creditors.

Results of Operations

         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  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 depreciation  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  POSICAMTM  systems  in  order to meet  current  technological
requirements by potential  customers.  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.

         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 Company's
loan from ProFutures (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.

                                       20
<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
Convertible  Preferred  Stock,  each  resulted  in more than a 50% change in the
ownership  percentages  of  shareholders,  the  provisions of Section 382 of the
Internal Revenue 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 Convertible
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.

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 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.  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 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 has made  payments to
such  management  level  employees to reduce its liability for past due salaries
and  benefits  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. This
amount excludes the nine months  severance demand made by Dr. Haas. See comments
under Employees above.

         Assuming  that the company is  successful  in obtaining an extension of
the October 5, 1998 maturity date of the ProFutures  Loan or the additional debt
or equity  financing  necessary to repay the  ProFutures  Loan, the Company will
also  require  additional  debt or equity  financing  to sustain its  operations
beyond the fourth quarter of 1998. The Company  currently is unable to seek such
additional  debt or equity  financing  and,  unless the  closing of the  Imatron
Transaction  occurs,  it is unlikely  that the  Company  will be able to seek to
obtain such financing.  In the event that the Imatron  Transaction  closes,  the
Company  intends to rely upon Imatron's  undertaking (to use its best efforts to
arrange  additional  third party equity  financing  for the Company) in order to
fulfill its current financing needs. There are no assurances that the closing of
the Imatron  Transaction will occur, or if the closing occurs, that Imatron will
be  successful  in arranging  additional  third party equity  financing  for the
Company or, if such equity financing is obtained,  that the terms of such equity
financing will be favorable to the Company or its securityholders.

         As a result of the Company's  liquidity  problems,  its auditors,  Ham,
Langston & Brezina, L.L.P., have added an explanatory paragraph to their opinion
on the Company's financial  statements  indicating that substantial doubt exists
about the Company's ability to continue as a going concern.

                                       21
<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  anticipates that it will hold a special meeting of its
shareholders  at which it will seek  approval  of the  Imatron  Transaction  and
approval of an increase in the number of authorized common shares;  however,  no
assurances  can be given  that such  additional  shares  will be  authorized  in
adequate time to allow the Company to issue such equity securities.

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 extreme 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.

Recently Issued Accounting Pronouncements

         In June 1997 the Financial  Accounting  Standards Board ("FASB") 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

         The Company is including  the  following  cautionary  statement in this
Annual Report on Form 10-KSB to make  applicable  and take advantage of the safe
harbor provision of the Private Securities Litigation Reform Act of 1995 for any
forward looking statements made by, or on behalf of the Company. Forward looking

                                       22
<PAGE>
         statements  include  statements  concerning  plans,  objectives,  goals
strategies,  future events or performance  and underlying  assumptions and other
statements  which  are  other  than  statements  of  historical  facts.  Certain
statements  contained  herein are forward looking  statements and,  accordingly,
involve risks and uncertainties  which could cause actual results or outcomes to
differ  materially from those expressed in the forward looking  statements.  The
Company's expectations,  beliefs and projections are expressed in good faith and
are  believed  by the  Company to have a  reasonable  basis,  including  without
limitations,  management's  examination  of historical  operating  trends,  data
contained in the Company's  records and other data available from third parties,
but  there  can  be no  assurance  that  management's  expectation,  beliefs  or
projections  will result or be achieved  or  accomplished.  In addition to other
factors and matters  discussed  elsewhere  herein,  the  following are important
factors that, in the view of the Company,  could cause actual  results to differ
materially from those discussed in the forward looking  statements:  the ability
of the  Company  to  attain  widespread  market  acceptance  of its  POSICAM(TM)
systems;  the ability of the Company to obtain  acceptable  forms and amounts of
financing to fund future  operations;  demand for the  Company's  services;  and
competitive  factors. The Company disclaims any obligation to update any forward
looking statements to reflect events or circumstances after the date hereof.

Item 7.  Financial Statements

         The required  Financial  Statements and the notes thereto are contained
in a separate  section of this  report  beginning  with the page  following  the
signature page.

Item 8.  Changes  in  and  Disagreements  with  Accountants  on  Accounting  and
Financial Disclosure

         On April 7, 1998,  Coopers & Lybrand L.L.P.  ("Coopers & Lybrand"),  by
means of a letter  addressed  to the  Chairman of the Board and Chief  Executive
Officer of Positron Corporation informed the Company that it had resigned as the
Company's independent auditors.  The resignation arises from Coopers & Lybrand's
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 (2) years  except:  (i)  Coopers &  Lybrand's
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 as of and for
the fiscal year ended December 31, 1997 have not been audited.

      This  decision  to resign  was made by Coopers & Lybrand  and was  neither
approved nor disapproved by the Company's Board of Directors.

      During the two most recent  fiscal  periods  ended  December  31, 1997 and
December 31, 1996 and from  December 31, 1997 to the date of Coopers & Lybrand's
resignation,  there were: (i) no disagreements between the Company and Coopers &
Lybrand 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 Coopers & Lybrand would have caused it to make reference
thereto in its report;  and (ii) no  reportable  events as defined in  paragraph
304(a)(1)(v) or Regulation S- K.

      Coopers & Lybrand has provided the Securities and Exchange Commission with
a letter agreeing to the disclosure contained herein.

      Coopers and Lybrand was  replaced by Ham,  Langston & Brezina,  L.L.P.  on
June 26, 1998.

      Prior to the engagement of Ham, Langston & Brezina,  L.L.P. as independent
auditors,  the Company had not  consulted  them  regarding  the  application  of
accounting principles to a specified transaction,  either completed or proposed;
or the type of audit opinion that might be rendered on the  Company's  financial
statements or any other financial presentation whatsoever.

      No  disagreements  exist between the Company and Ham,  Langston & Brezina,
L.L.P. on any matters of accounting principles or practices, financial statement
disclosure, or auditing scope or procedure.

                                       23
<PAGE>
                                    PART III

Item 9. Directors, Executive Officers, Promoters and Control Persons; Compliance
With Section 16(a) of the Exchange Act

                        DIRECTORS AND EXECUTIVE OFFICERS

         The  directors,  executive  officers  and key  employees of the Company
consist of the following individuals:

  Name                           Age               Position

  Gary B. Wood, Ph.D.             47      Director, Chairman of the Board and
                                          Interim Chief Executive Officer

  K. Lance Gould. M.D.            57      Director

  John H. Laragh, M.D.            69      Director

  Ronald B. Schilling, Ph.D.      56      Director

  William S. Kiser, M.D.          68      Director (resigned effective
                                          May 1,  1998)

  Werner J. Haas, Ph.D.           59      Director, President and Chief
                                          Executive Officer (resigned effective
                                          February 1, 1997)

  Howard R. Baker                 45      Executive Vice President (resigned
                                          effective April 14,  1998)
 
  David O. Rodrigue               49      Chief Financial Officer and Secretary
                                          (resigned effective January 21,  1998)

  Richard Hitchens                53      Vice President Engineering (resigned
                                          effective October 1, 1996)


         Gary B. Wood,  Ph.D.,  has served as director and Chairman of the Board
of Directors of the Company  since April 1990.  From October 1, 1994 to December

                                       24
<PAGE>
31, 1995, he also 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 CEO pending the selection of a new President and CEO. 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
health care  industries.  Dr. Wood holds a BS and MS 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.

         K. Lance Gould, M.D., one of the inventors of the Company's POSICAM(TM)
system,  has  served as a  director  and as Special  Medical  Consultant  to the
Company since 1984. For more than the last five years, Dr. Gould has served as a
Professor of Medicine at the University of Texas Medical School in Houston.  Dr.
Gould holds a BA in Physics from Oberlin College and a M.D. from Western Reserve
Medical School.

         John H. Laragh,  M.D. has served as a director since December 1993. Dr.
Laragh  has been  Chief of the  Division  of  Cardiology  of the  Department  of
Medicine at the Cornell  University  Medical College since 1976, and Director of
the Cardiovascular  Center at the New York Hospital Cornell Medical Center since
1975. Dr. Laragh holds a BA and a M.D. from Cornell University.

         Ronald B. Schilling,  Ph.D., has served as a director since March 1995.
Since 1992 he has served as President  and Chief  Executive  Officer of Prime-X,
General  Imaging,  Inc., a sensor imaging  technology  company,  and served as a
consultant  to other  medical  technology  companies.  From  1987 to  1992,  Dr.
Schilling  was Senior  Vice  President  and General  Manager at Toshiba  America
Medical  Systems,  Inc., a medical  technology  company.  Dr.  Schilling holds a
B.S.E.E.  in electrical  engineering  from City College of New York, an M.S.E.E.
from Princeton University, and Ph.D.
from the New York Polytechnic Institute.


Item 10.  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 as executive officers of the Company during 1997 and 1996.

<TABLE>
                                            Summary Compensation Table
<CAPTION>
                                                   Annual Compensation           Awards   Payouts
          (a)             (b)       (c)      (d)           (e)            (f)         (g)     (h)          (I)
                      ------------------------------------------------------------------------------------------- 
                                                                     Restricted  Options/
Name and Principal    Fiscal    Salary    Bonus     Other Annual        Stock      SARs     LTIP        All Other
       Position        Year        ($)      ($)     compensation     Award(s)        (#)  Payouts ($)Compensation
- -----------------------------------------------------------------------------------------------------------------
<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 (1)          -          -       -             -
Executive Officer     1995       165,000  28,333       86,083 (2)          -      53,636 (3)  -             -
(October 1, 1994 to
December 31, 1995 and
February 1, 1997 to
Present)

Werner J. Haas, Ph.D. 1997         8,021       -           -               -          -       -             -
(Resigned as CEO on   1996       204,800       -       16,600 (4)          -          -       -             -
February 1, 1997)     1995          N/A        -           -               -          -       -             -
<FN>
(1)  Represents $80,000 in consulting fees paid to Dr. Wood and  $18,000 in directors fees.

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

(3)  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 CEO during 1995.

(4)  These amounts represent the Company's reimbursement of certain of Dr. Haas' living
     expenses during the period he served as President and CEO of the Company.
</FN>
</TABLE>

                                       25
<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 Year-     Money Options/SARs at Fiscal
                                                                        End                            Year-End
- ------------------------       ------------    --------     -----------    ------------     -----------     ------------
                                   Shares        Value
                                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.                     0           0        ________               0            0(1)              0(1)
<FN>
(1)      Based upon the exercise price in effect on December 31, 1997 and the closing price of $0.250 for the Company's Common Stock
         on December 31, 1997, as reported on the NASDAQ National Market System.
</FN>
</TABLE>

                                       26
<PAGE>
Compensation of Directors

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

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

Employment Agreement

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

         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.



                                       27
<PAGE>
         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 Company's Board of Directors.  The
Company has  indicated to Dr. Haas that it believes no amounts are due him under
his employment agreement.  As of June 30, 1998, 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 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 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 stockholders).  Payment of the
exercise  price is made by check or in such other form as may be  acceptable  to
the Board of Directors including,  under certain circumstances,  the delivery of
Common Stock.
No options may be granted under the 1987 Plan after June 1, 1997.

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

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

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

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

                                       28
<PAGE>
         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
Company's  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,  1997,
345,481  options had been  granted to  employees  and  113,724  options had been
granted to non-employee directors.

         The  Compensation  Committee of the Board of Directors  administers the
1994 Plan.  The  Compensation  Committee  consists of 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  a 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.

         The  401(k)  Plan is  intended  to  qualify  under  Section  401 of the
Internal Revenue Code of 1986, 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.



                                       29
<PAGE>
         The Company's  contributions to the 401(k) Plan for the accounts of Mr.
Haas were $0 in 1997,  and $2,339 in 1996.  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 Internal  Revenue Code.  Amendments to the Internal
Revenue  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 year 1997 or 1996.

Item 11. Security Ownership of Certain Beneficial Owners and Management

         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 five percent of the outstanding
shares of Common Stock; (ii) each director and executive officer of the Company;
and (iii) all  executive  officers  and  directors  of the  Company  as a group.
Included in the "Number of Shares of Common  Stock" are shares  attributable  to
options or warrants that are exercisable as of, or will be exercisable within 60
days after, December 31, 1997.
<TABLE>
<CAPTION>
                                    Number of      Percent of       Number of      Percent of      Number of      Percent of
 Name of Beneficial                  Shares       Outstanding      Shares of      Outstanding     Shares of      Outstanding
       Owner(1)                    of Common         Common         Series A        Series A        Series B       Series B
                                     Stock            Stock         Preferred       Preferred      Preferred       Preferred
                                                                      Stock           Stock          Stock           Stock

<S>                                  <C>               <C>          <C>                <C>           <C>               <C>  
Auer & Co.(2)                        600,000           11.3%        399,996            25.1%
c/o ASB Capital Mgt.
1101 Pennsylvania Avenue
NW, Suite 300
Washington, DC 20004

DHB Capital                                                                                          25,000            100%
11 Old Westbury Rd.
Old Westbury, NY  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%
Omni-MedCorporation
5430 LBJ Freeway
Dallas, Texas  75240

John H. Laragh, M.D.(6)
Positron Corporation                  31,709               *
16350 Park Ten Place
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 (5 persons)
<FN>
*  Less than 1%

                                       30
<PAGE>
(1)      Except as otherwise indicated, each stockholder 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 issuable upon the conversion of 400,000 shares
         of Series A 8% Cumulative  Convertible  Redeemable  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 issuable upon the conversion of 433,333 shares
         of Series A 8% Cumulative  Convertible  Redeemable  Preferred Stock and
         216,671  warrants to purchase Common Stock acquired upon the conversion
         of $650,000 in principal  amount of the Uro-Tech  Loan.  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  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>
                                       31
<PAGE>

Item 12. 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,  1% each to the
Clayton  Foundation,  K. Lance Gould and Nizar A.  Mullani.  The Company has not
made any royalty payments since 1993. As of June 30, 1998 approximately $368,000
was owned to the aforementioned individuals for past due royalties.

         The 3% total royalty  obligation of the Company was based on agreements
with Nizar A. Mullani and K. Lance Gould under which they  previously  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 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.

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.

                                       32
<PAGE>
         In November 1993, the Company  entered into an agreement with Dr. Gould
under which the Company  became  obligated to extend loans to Dr. Gould in order
to provide him with funds to satisfy his personal  income tax liability  arising
out of the conversion of his 9% Convertible  Promissory Notes into Common Stock.
Such  agreement  was  entered  into by the Company in  consideration  of certain
concessions  made by Dr.  Gould  concerning  the  conversion  terms under his 9%
Convertible Promissory Notes. Pursuant to the agreement,  the loans, would be on
substantially the following terms if made: (I) limited to a principal amount not
to exceed $175,000,  (ii) interest payable at the rate of six percent 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. This loan was not repaid upon maturity and was fully
reserved by the Company at December 31, 1997.

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 system.

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.


                                       33
<PAGE>
Item 13.   Exhibits, Lists and Reports on Form 8-K

Exhibits:
3.1         Articles of Incorporation of the Registrant (incorporated  herein by
            reference to Exhibit 3.1 to the Company's  Registration Statement on
            Form SB-2 (File No. 33-68722)).
3.2         By-laws  of the  Registrant,  as  amended  (incorporated  herein  by
            reference to Exhibit 3.2 to the Company's  Registration Statement on
            Form SB-2 (File No. 33-68722)).
4.1         Specimen  Stock  Certificate  (incorporated  herein by  reference to
            Exhibit 4.1 of the  Company's  Annual  Report on Form 10-KSB for the
            year ended December 31, 1994).
4.2         Form of Redeemable Warrant (included as part of Exhibit 10.71)
4.3         Statement  of  Designation   Establishing  Series  A  8%  Cumulative
            Convertible  Redeemable  Preferred  Stock of  Positron  Corporation,
            dated February 28, 1996 (incorporated herein by reference to Exhibit
            4.3 of the Company's Annual Report on Form 10-KSB for the year ended
            December 31, 1995).
4.4         Warrant  Agreement dated as of February 29, 1996,  between  Positron
            Corporation   and   Continental   Stock  Transfer  &  Trust  Company
            (incorporated  herein by reference  to Exhibit 4.4 of the  Company's
            Annual Report on Form 10-KSB for the year ended December 31, 1995).

4.5         Specimen Redeemable Warrant Certificate to Purchase Shares of Common
            Stock  (incorporated  herein  by  reference  to  Exhibit  4.5 of the
            Company's  Annual Report on Form 10-KSB for the year ended  December
            31, 1995).
4.6         Stock  Purchase  Warrant  dated as of  February  7,  1996  issued by
            Positron  Corporation  to  Boston  Financial  &  Equity  Corporation
            (incorporated  herein by reference  to Exhibit 4.6 of the  Company's
            Annual Report on Form 10-KSB for the year ended December 31, 1995).
4.7*        Statement  of  Designation   Establishing  Series  B  8%  Cumulative
            Convertible  Redeemable  Preferred  Stock of  Positron  Corporation,
            dated July 9, 1996.
4.8*        Form of  Warrant  Agreement  dated  as of  July  10,  1996,  between
            Positron Corporation and Brooks Industries Profit Sharing Plan.

                                       34
<PAGE>
10.1        Lease  Agreement  dated as of July 1, 1991,  by and between  Lincoln
            National  Pension   Insurance   Company  and  Positron   Corporation
            (incorporated  herein by reference to Exhibit 10.1 to the  Company's
            Registration Statement on Form SB-2 (File No. 33-68722)).
10.2        Agreement  dated  as of  March  1,  1993,  by and  between  Positron
            Corporation and Oxford Instruments (UK) Limited (incorporated herein
            by reference to Exhibit 10.2 to the Company's Registration Statement
            on Form SB-2 (File No. 33-68722)).
10.3        International  Distribution  Agreement dated as of November 1, 1992,
            by and between Positron  Corporation and Batec  International , Inc.
            (incorporated  herein by reference to Exhibit 10.3 to the  Company's
            Registration Statement on Form SB-2 (File No. 33-68722)).
10.4+       1994 Incentive and Nonstatutory Option Plan.
10.5+       Amended and Restated 1987 Stock Option Plan (incorporated  herein by
            reference to Exhibit 10.5 to the Company's Registration Statement on
            Form SB-2 (File No. 33-68722)).
10.6+       Retirement Plan  and  Trust (incorporated  herein  by  reference  to
            Exhibit 10.6 to the  Company's  Registration  Statement on Form SB-2
            (File No. 33-68722)).
10.7        Amended and Restated License Agreement dated as of June 30, 1987, by
            and among The Clayton Foundation for Research, Positron Corporation,
            K. Lance Gould, M.D., and Nizar A. Mullani  (incorporated  herein by
            reference to Exhibit 10.7 to the Company's Registration Statement on
            Form SB-2 (File No. 33-68722)).
10.8        Clarification  Agreement  to Exhibit  10.7  (incorporated  herein by
            reference to Exhibit 10.8 to the Company's Registration Statement on
            Form SB-2 (File No. 33-68722)).
10.9        Royalty  Assignment dated as of December 22, 1988, by and between K.
            Lance  Gould  and  Positron  Corporation   (incorporated  herein  by
            reference to Exhibit 10.10 to the Company's  Registration  Statement
            on Form SB-2 (File No. 33-68722)).
10.10       Royalty  Assignment  dated as of December 22,  1988,  by and between
            Nizar A. Mullani and Positron  Corporation  (incorporated  herein by
            reference to Exhibit 10.11 to the Company's  Registration  Statement
            on Form SB-2 (File No. 33-68722)).
10.11       Royalty Assignment dated as of December 22, 1988, by and between The
            Clayton Foundation and Positron Corporation  (incorporated herein by
            reference to Exhibit 10.12 to the Company's  Registration  Statement
            on Form SB-2 (File No. 33-68722)).

                                       35
<PAGE>
10.12+      Stock  Purchase  Warrant dated  October 31, 1993,  issued to Gary B.
            Wood  (incorporated  herein by  reference  to  Exhibit  10.15 to the
            Company's Registration Statement on Form SB-2 (File No. 33- 68722)).
10.13       Amendment  No. 1 to  Exhibit 10.22 (incorporated herein by reference
            to Exhibit  10.23 to the  Company's  Registration  Statement on Form
            SB-2 (File No. 33-68722)).
10.14+      Consulting  Agreement dated  as of  January 15, 1993, by and between
            Positron  Corporation and K. Lance Gould, M.D.  (incorporated herein
            by  reference  to  Exhibit  10.24  to  the  Company's   Registration
            Statement on Form SB-2 (File No. 33-68722)).
10.15       Stock Purchase  Warrant dated February 25, 1993,  issued to K. Lance
            Gould  (incorporated  herein by  reference  to Exhibit  10.26 to the
            Company's Registration Statement on Form SB-2 (File No.
            33-68722)).
10.16+      Consulting Agreement dated February 23, 1995, effective December 15,
            1994, by and between Positron  Corporation and F. David Rollo,  M.D.
            Ph.D., FACNP.
10.17+      Consulting  Agreement  dated as of January 15, 1993,  by and between
            Positron  Corporation and Nizar A. Mullani  (incorporated  herein by
            reference to Exhibit 10.31 to the Company's  Registration  Statement
            on Form SB-2 (File No. 33-68722)).
10.18+      Consulting  Agreement  dated as of November 12, 1993, by and between
            Positron Corporation and OmniMed Corporation (incorporated herein by
            reference to Exhibit 10.35 to the Company's  Registration  Statement
            on Form SB-2 (File No. 33-68722)).
10.19       Contract  No. 1318 dated as of  December  30,  1991,  by and between
            Positron  Corporation  and The  University  of Texas Health  Science
            Center at Houston (incorporated herein by reference to Exhibit 10.39
            to the  Company's  Registration  Statement  on Form  SB-2  (File No.
            33-68722)).
10.20+      Letter  Agreement dated July 30, 1993 between  Positron  Corporation
            and Howard Baker (incorporated  herein by reference to Exhibit 10.52
            to the  Company's  Registration  Statement  on Form  SB-2  (File No.
            33-68722)).
10.21       Technology Transfer Agreement dated as of September 17, 1990, by and
            between  Positron  Corporation  and Clayton  Foundation for Research
            (incorporated  herein by reference to Exhibit 10.54 to the Company's
            Registration Statement on Form SB-2 (File No. 33-68722)).
10.22       Stock Purchase Warrant dated as of October 31, 1993 issued to Gerald
            Hillman  (incorporated  herein by reference to Exhibit  10.56 to the
            Company's Registration Statement on Form SB-2 (File No. 33-68722)).
10.23       Stock  Purchase  Warrant  dated as of October 31, 1993 issued to The
            Dover Group  (incorporated  herein by reference to Exhibit  10.57 to
            the  Company's   Registration  Statement  on  Form  SB-2  (File  No.
            33-68722)).
10.24       Stock  Purchase  Warrant dated as of October 31, 1993 issued to John
            Wilson  (incorporated  herein by reference  to Exhibit  10.63 to the
            Company's Registration Statement on Form SB-2 (File No.
            33-68722)).
10.25+      Stock Purchase Warrant dated as of October 31, 1993 issued to Robert
            Guezuraga  (incorporated herein by reference to Exhibit 10.64 to the
            Company's Registration Statement on Form SB-2 (File No. 33-68722)).
10.26       Stock  Purchase  Warrant  dated as of  October  31,  1993  issued to
            Richard Ronchetti (incorporated herein by reference to Exhibit 10.65
            to the  Company's  Registration  Statement  on Form  SB-2  (File No.
            33-68722)).
10.27       Form of Amended and Restated  Registration Rights Agreement dated as
            of November 3, 1993, by and among Positron and the other signatories
            thereto (1993 Private Placement)  (incorporated  herein by reference
            to Exhibit  10.73 to the  Company's  Registration  Statement on Form
            SB-2 (File No.
            33-68722)).

                                       36
<PAGE>
10.28       Registration  Rights  Agreement  dated as of July 31,  1993,  by and
            among  Positron and the other  signatories  thereto  (other than the
            1993 Private Placement) (incorporated herein by reference to Exhibit
            10.74 to the Company's Registration Statement on Form SB-2 (File No.
            33-68722)).
10.29       Software Licenses dated as of March 1, 1993, by and between Positron
            Corporation and Oxford Instruments (UK) Limited (incorporated herein
            by  reference  to  Exhibit  10.81  to  the  Company's   Registration
            Statement on Form SB-2 (File No. 33-68722)).
10.30       Distribution  Agreement  dated as of June 1,  1993,  by and  between
            Positron  Corporation  and  Elscint,  Ltd.  (incorporated  herein by
            reference to Exhibit 10.82 to the Company's  Registration  Statement
            on Form SB-2 (File No. 33-68722)).
10.31+      Employment  Agreement  dated as of August 19,  1993,  by and between
            Positron Corporation and Richard E. Hitchens (incorporated herein by
            reference to Exhibit 10.83 to the Company's  Registration  Statement
            on Form SB-2 (File No. 33-68722)).
10.32+      Employment  Agreement  dated as of August 19,  1993,  by and between
            Positron  Corporation  and Howard R. Baker  (incorporated  herein by
            reference to Exhibit 10.84 to the Company's  Registration  Statement
            on Form SB-2 (File No. 33-68722)).
10.33       Amended and Restated  Warrant  Agreement dated as of April 14, 1994,
            by and between Positron  Corporation and Continental  Stock Transfer
            and Trust Company (including form of Warrant Certificate).
10.34       First  Amendment  to  Amended  and  Restated   Registration   Rights
            Agreement,  dated as of November  19,  1993,  by and among  Positron
            Corporation and the other signatories thereto  (incorporated  herein
            by  reference  to  Exhibit  10.91  to  the  Company's   Registration
            Statement on Form SB-2 (File No.
            33-68722)).
10.35       Agreement  made and  entered  into as of October  31,  1993,  by and
            between  Positron  Corporation  and Nizar A.  Mullani  (incorporated
            herein by reference to Exhibit 10.97 to the  Company's  Registration
            Statement on Form SB-2 (File No. 33-68722)).
10.36       Agreement  made and  entered  into as of October  31,  1993,  by and
            between Positron Corporation and K. Lance Gould (incorporated herein
            by  reference  to  Exhibit  10.98  to  the  Company's   Registration
            Statement on Form SB-2 (File No. 33-68722)).
10.37       Agreement  made and entered  into as of November  15,  1993,  by and
            between  Positron  Corporation  and Nizar A.  Mullani  (incorporated
            herein by reference to Exhibit 10.100 to the Company's  Registration
            Statement on Form SB-2 (File No. 33-68722)).
10.38       Agreement  made and entered  into as of November  15,  1993,  by and
            between Positron Corporation and K. Lance Gould (incorporated herein
            by  reference  to  Exhibit  10.101  to  the  Company's  Registration
            Statement on Form SB-2 (File No. 33-68722)).
10.39       First  Amendment  made and  entered as of January 25,  1994,  by and
            between Emory  University  d/b/a Crawford Long Hospital and Positron
            Corporation  (incorporated  herein by reference to Exhibit 10.102 of
            the  Company's  Annual  Report  on Form  10-KSB  for the year  ended
            December 31, 1993).
10.40+      Employment  Agreement dated January 1, 1996 by and between Werner J.
            Haas,  Ph.D.  and  Positron  Corporation   (incorporated  herein  by
            reference to Exhibit  10.40 of the  Company's  Annual Report on Form
            10-KSB for the year ended December 31, 1995).
10.41       Loan and Security  Agreement  made as of November 14, 1995,  between
            Positron  Corporation  and Uro-Tech,  Ltd.  (incorporated  herein by
            reference to Exhibit  10.41 of the  Company's  Annual Report on Form
            10-KSB for the year ended December 31, 1995).
10.42       First  Modification  and Extension  Agreement  made as of January 3,
            1996,  by Positron  Corporation  and  Uro-Tech,  Ltd.  (incorporated
            herein by reference to Exhibit 10.42 of the Company's  Annual Report
            on Form 10-KSB for the year ended December 31, 1995).
10.43       Second  Modification and Extension Agreement made as of February 26,
            1996 by Positron Corporation and Uro-Tech, Ltd. (incorporated herein
            by reference to Exhibit 10.43 of the Company's Annual Report on Form
            10-KSB for the year ended December 31, 1995).



                                       37
<PAGE>
10.44       Uro-Tech Loan  Conversion  Agreement  dated as of November 14, 1995,
            between Positron Corporation and Uro-Tech, Ltd. (incorporated herein
            by reference to Exhibit 10.44 of the Company's Annual Report on Form
            10-KSB for the year ended December 31, 1995).
10.45       Promissory Note dated September 14, 1995, in the principal amount of
            $1,500,000  payable  to Uro-  Tech,  Ltd.  (incorporated  herein  by
            reference to Exhibit  10.45 of the  Company's  Annual Report on Form
            10-KSB for the year ended December 31, 1995).
10.46       Promissory Note dated September 14, 1995, in the principal amount of
            $1,000,000  payable  to Uro-  Tech,  Ltd.  (incorporated  herein  by
            reference to Exhibit  10.46 of the  Company's  Annual Report on Form
            10-KSB for the year ended December 31, 1995).
10.47       Revolving   Finance   agreement  with  Boston   Financial  &  Equity
            Corporation  (incorporated  herein by reference to Exhibit  10.47 of
            the  Company's  Annual  Report  on Form  10-KSB  for the year  ended
            December 31, 1995).
10.48       Security   Agreement   Boston   Financial   &   Equity   Corporation
            (incorporated  herein by reference to Exhibit 10.48 of the Company's
            Annual Report on Form 10-KSB for the year ended December 31, 1995).
10.49       Supplement  to Security  Agreement  Security  Interest in  Inventory
            (incorporated  herein by reference to Exhibit 10.49 of the Company's
            Annual Report on Form 10-KSB for the year ended December 31, 1995).
10.50       Inter-Creditor   Agreement  (incorporated  herein  by  reference  to
            Exhibit 10.50 of the Company's  Annual Report on Form 10-KSB for the
            year ended December 31, 1995).
10.51       Loan  Agreement  between  Positron Corporation and ProFutures Bridge
            Capital Fund, L.P. dated November 1, 1996.
10.52       Promissory Note dated  November 14, 1996, in the principal amount of
            $1,400,000 payable to ProFutures Bridge Capital Fund, L.P.
10.53       InterCreditor  Agreement  dated  November  14, 1996 among  Uro-Tech,
            Ltd.,  Boston Financial & Equity  Corporation and ProFutures  Bridge
            Capital Fund, L.P.
10.54       Amendment to BF&E loan
10.55       Amendment to Uro-Tech loan
10.56       Acquisition Agreement  between General Electric Company and Positron
            Corporation dated July 15, 1996.
10.57*      Loan Agreement between Positron Corporation and Imatron, Inc..
10.58       Sales and Marketing Agreement With Beijing Chang Feng Medical.
10.59*      Stock Purchase Agreement between Positron Corp. and Imatron, Inc.
10.60*      Promissory Note from Positron Corporation to Imatron, Inc.
27.0*       Financial Data Schedule

*          Filed herewith
+          Management  contract or  compensatory plan  or arrangement identified
           pursuant to Item 13(a).

Form 8-K Reports:

           No  current  report on Form 8-K was filed by the  Company  during the
fourth quarter of 1997.

                                       38
<PAGE>
                                  SIGNATURES

         In  accordance  with  Section  13 or 15(d)  of the  Exchange  Act,  the
Registrant  caused  this  report to be signed on its behalf by the  undersigned,
thereunto duly authorized.

                              POSITRON CORPORATION


Date: September 17, 1998                       By:      /S/ GARY B. WOOD, PH.D.
                                                        Gary B. Wood, Ph.d.
                                                        Chairman of the Board

         In accordance  with the Exchange Act, this report has been signed below
by the following  persons on behalf of the  Registrant and in the capacities and
on the dates indicated.


/S/ GARY B.WOOD, PH.D.                                  __________________, 1998
Gary B. Wood, Ph.D.
Chairman of the Board, President and Chief
Executive Officer; Director
(Principal Executive Officer)

/S/ K. LANCE GOULD, M.D.                                __________________, 1998
K. Lance Gould, M.D.
Director

/S/ JOHN H. LARAGH, M.D.                                __________________, 1998
John H. Laragh, M.D.
Director

/S/ RONALD B. SCHILLING, PH.D.                          __________________, 1998
Ronald B. Schilling, Ph.D.
Director

<PAGE>
                              POSITRON CORPORATION
                              --------------------
                              FINANCIAL STATEMENTS
                     WITH REPORT OF INDEPENDENT ACCOUNTANTS
                 for the years ended December 31, 1997 and 1996


                              POSITRON CORPORATION
                                TABLE OF CONTENTS
                                   ----------

                                                                       Page(s)

Report of Independent Accountants                                   F-2 to F-3

Balance Sheets as of December 31,
  1997 and 1996                                                            F-4

Statements of Operations for the
  years ended December 31, 1997 and 1996                                   F-5

Statements of Stockholders' Deficit for the
  years ended December 31, 1997 and 1996                                   F-6

Statements of Cash Flows for the years
  ended December 31, 1997 and 1996                                         F-7

Notes to Financial Statements                                      F-8 to F-28



                                       F-1

<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,  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 has 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

                                       F-2
<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 has 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

                                       F-3
<PAGE>
<TABLE>
                                                        POSITRON CORPORATION
                                                           BALANCE SHEETS
                                                        --------------------
                                                  (In thousands, except share data)
<CAPTION>

                                                                                                              December 31,
                                                                                                      1997                    1996
ASSETS:                                                                                             --------               --------
<S>                                                                                                 <C>                    <C>     
Current assets:
  Cash and cash equivalents                                                                         $    160               $    382
  Accounts receivable, net                                                                               253                    520
  Notes receivable                                                                                      --                      324
  Inventories                                                                                            408                  2,633
  Prepaid expenses                                                                                       131                    159
  Other current assets                                                                                  --                      426
                                                                                                    --------               --------
    Total current assets                                                                                 952                  4,444

Plant and equipment, net                                                                                 715                    967
Intangible assets, net                                                                                  --                      106
                                                                                                    --------               --------
    Total assets                                                                                    $  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% cumula-
    tive, convertible, redeemable; 25,000 shares auth-
    orized, issued and outstanding at December 31, 1997
    and 1996, respectively                                                                                25                     25
  Common stock:  $0.01 par value; 15,000,000 shares
    authorized, 5,128,990 and 4,312,182 shares issued
    and 5,068,834 and 4,312,182 shares outstanding at
    December 31, 1997 and 1996, respectively                                                              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
        deficit                                                                                     $  1,667               $  5,517
                                                                                                    ========               ========
<FN>
                                                 See notes to financial statements.
</FN>
                                                                 F-4
</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                                                                    645                        610
  Provision for loss on system exchange                                                             --                        1,000
  Provision for inventory obsolescence                                                             1,224                       -- 
                                                                                             -----------                -----------
    Total costs of sales and service                                                               2,543                      2,098
                                                                                             -----------                -----------
      Gross profit                                                                                   983                      1,477
                                                                                             -----------                -----------
Operating expenses:
 Research and development                                                                          1,305                      2,227
 Selling, general and administrative                                                               3,609                      5,263
                                                                                             -----------                -----------
   Total operating costs                                                                           4,914                      7,490
                                                                                             -----------                -----------
Loss from operations                                                                              (3,931)                    (6,013)
                                                                                             -----------                -----------
Other expenses:
  Interest expense                                                                                  (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>
                                                                 F-5
</TABLE>
<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>
                                                                 F-6
</TABLE>
<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 in accounts receivable                                                                    120                    137
      Decrease in inventories                                                                          1,001                     33
      Decrease in prepaid expenses                                                                        28                     13
      Decrease (increase) in other current assets                                                        426                   (368)
      Increase (decrease) in accounts payable, trade                                                     460                   (642)
      Increase in accrued liabilities                                                                    551                    335
      Increase (decrease) in revolving line of credit                                                    (75)                    75
      Increase (decrease) in other liabilities                                                           177                    (11)
      Decrease in unearned revenue                                                                      (207)                  (190)
                                                                                                     -------                -------
        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>
                                                                 F-7
</TABLE>                                                       
<PAGE>
                              POSITRON CORPORATION
                          NOTES TO FINANCIAL STATEMENTS
                          -----------------------------

1.     Description of Business

       Positron  Corporation  (the  "Company") was  incorporated on December 20,
       1983 in the state of Texas and  commenced  commercial  operations  during
       1986.  The  Company  designs,  manufacturers,  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  from 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.  Additionally,  the Company is subject to
       certain  unasserted  claims  which,  as of July 25,  1998,  have not been
       resolved.

       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.


                                       F-8
<PAGE>
       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

       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 costs 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.
       Intangible  assets were written down by approximately  $79,000 to zero at
       December 31, 1997 to reduce them to their estimated net realizable value.


                                       F-9
<PAGE>
       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.

                                      F-10
<PAGE>
       Fair Value of Financial Instruments

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

       Reclassifications

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

       New Accounting Pronouncements

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

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

3.     Accounts Receivable

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

                                                      1997                1996
                                                    ------               ------
                                                           (In thousands)
Accounts receivable-- equipment sales               $1,011               $1,011
Accounts receivable-- maintenance                      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
                                                    ======               ======

                                      F-11
<PAGE>
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.


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


                                      F-12

<PAGE>
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                                           740           889
                                                   -------       -------

                                                   $ 3,205       $ 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 at 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.


                                      F-13
<PAGE>
9.     Other Notes Payable

       On November  14, 1996,  in order to fund its  continued  activities,  the
       Company  obtained a loan facility (the  "ProFutures  Loan") of $1,400,000
       from ProFutures Bridge Capital, L.P. ("ProFutures").  The ProFutures Loan
       originally  bore interest at a rate of 12% until April  1,1997,  at which
       date, the rate increased to 15%. The ProFutures  loan matured on June 30,
       1997;  however,  the Company  was unable to repay the debt.  Accordingly,
       under terms specified in the loan agreement, after November 30, 1997, the
       interest  rate  increased  to 18% per year.  As of December  31, 1997 and
       1996,   approximately   $930,000  and   $1,335,000,   respectfully,   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 to $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.


                                      F-14
<PAGE>
       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 at 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.

    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
                                            =======

                                      F-15
<PAGE>
       The  Company  has  elected to apply the  disclosure  only  provisions  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 date 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 1997 and 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 1997 and 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%.


                                      F-16
<PAGE>
       The pro forma  disclosures as if the Company adopted the cost recognition
       requirements of SFAS 123 are as follows (in thousands):

                                     1997                       1996
                          -------------------------   --------------------------
                          As Reported    Pro Forma     As Reported     Pro Forma
                             -------       -------       -------        ------- 
Net loss                     $(4,455)      $(4,455)      $(6,375)       $(6,476)
Earnings per common share    $ (0.91)      $ (0.93)      $ (1.67)       $ (1.70)

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

       Warrants

       Prior to the  Company's  initial  public  offering,  the  Company  issued
       warrants to the  purchasers  of the then  outstanding  Series E Preferred
       Stock  (the  "1993   Warrants").   Subject  to  adjustment   for  certain
       transactions,  the 1993 Warrants as originally  issued,  were exercisable
       for an aggregate of 353,531  shares of Common Stock at an exercise  price
       of $9.90. Because of certain specified anti-dilution provisions, the 1993
       Warrants were  exercisable  for an aggregate of 519,394  shares of Common
       Stock at a purchase  price of $5.60 per share as of December 31, 1997 and
       1996.  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 or 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.

                                      F-17
<PAGE>
       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 and 1996.  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.

                                      F-18
<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  or  involuntary
       liquidation,   dissolution  or  winding  up  of  the  Company,   and  the
       preferences and relative rights among each series of preferred stock.

                                      F-19
<PAGE>
       Series A 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.  Eight percent (8%) dividends on the Series A Preferred  Stock may
       be paid in cash or in Series A Preferred  Stock at the  discretion of the
       Company. The Series A Preferred Stock is senior to the Company's Series B
       Preferred Stock and Common Stock in liquidation.  Holders of the Series A
       Preferred  stock  may  vote on an as if  converted  basis  on any  matter
       requiring  shareholder  vote.  While  the  Series  A  Preferred  Stock is
       outstanding  or any  dividends  thereon  remain  unpaid,  no Common Stock
       dividends may be paid or declared by the Company.  The Series A Preferred
       Stock may be redeemed in whole or in part,  at the option of the Company,
       at any time  subsequent  to March 1998 at a price of $1.46 per share plus
       any  undeclared  and/or  unpaid  dividends  to the  date  of  redemption.
       Redemption  requires at least 30 days advanced notice and notice may only
       be given if the  Company's  common stock has closed above $2.00 per share
       for the twenty consecutive trading days prior to the notice.

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

       Series B Preferred Stock

       In July 1996,  the Company issued 25,000 shares of Series B 8% Cumulative
       Convertible  Redeemable  Preferred  stock  $1.00  par  value  ("Series  B
       Preferred  Stock") and Common Stock  Purchase  Warrants to purchase up to
       100,000 shares of its Common stock,  par value $.01 per share. The Series
       B  Preferred   Stock  plus  Common  Stock  Purchase   Warrants  sold  for
       approximately  $50.00 per share of Series B Preferred  stock.  Subject to
       adjustment  for  certain  antidilution  events,  each  share of  Series B
       Preferred Stock is initially  convertible  into 25 shares of Common Stock
       and each Common Stock Purchase  Warrant is  exercisable  for one share of
       Common Stock at an exercise price of $2.00 per share.  Eight percent (8%)
       dividends on

                                      F-20
<PAGE>
       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.



                                      F-21
<PAGE>
12.    Income Taxes

       The Company has incurred losses since its inception and,  therefore,  has
       not been subject to federal  income taxes.  As of December 31, 1997,  the
       Company  had net  operating  loss  ("NOL")  carryforwards  for income tax
       purposes of approximately  $43,000,000 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.  If the  Imatron  Transaction  is  completed  the  Company's
       ability  to  utilize  the NOL  carryforwards  could be  further  limited.
       Additionally,  because United States tax laws limit the time during which
       NOL  carryforwards  may be applied  against  future taxable  income,  the
       Company  will not be able to take full  advantage  of its NOL for federal
       income tax purposes should the Company generate taxable income.

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

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

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

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



                                      F-22
<PAGE>
       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 $36,000 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.



                                      F-23
<PAGE>
       Pursuant  to  agreements  entered  into in  November  1993,  the  Company
       extended  loans to a current  board  member and a former  board member in
       order to  provide  each of them with funds to  satisfy  their  respective
       personal  income tax liability  arising out of the  conversion of certain
       Positron Corporation  Promissory Notes into Common Stock. Such agreements
       were  entered  into by the  Company  in  connection  with  the IPO and in
       consideration of certain  concessions made by the board member and former
       board  member  concerning  the  conversion  terms under their  respective
       Notes.  Pursuant  to the  agreements,  each  of the  loans  were  made on
       substantially  the following terms: (i) limited to a principal amount not
       to exceed  $175,000,  (ii) interest  payable at a rate of six percent per
       year,  (iii) an initial  term of three years with the  principal  balance
       being due and  payable  upon the  expiration  of the term,  (iv)  limited
       recourse  against  the  borrower,  and  (v)  collateralized  by  Positron
       Corporation  Common Stock owned by the borrower.  In accordance with such
       agreements,  on April 15, 1994, the Company extended a $165,817 loan to a
       current board member and a $158,552 loan to the former board member.

       Both of the notes receivable matured in April 1997 but were not repaid by
       the debtors and, accordingly, 60,156 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.





                                      F-24
<PAGE>
       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.  During the
       years ended December 31, 1997 and 1996 the Company incurred  royalties of
       $42,000 and $134,000, respectively.

       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 will be entitled to receive an  aggregate 2% royalty and the second
       payee will be entitled to receive an aggregate 1.5% royalty, resulting in
       an increase of the Company's  royalty  obligations  from 3% to 4.5%. Such
       increase in royalty  obligations  could have a material adverse effect on
       the Company's future financial performance.

                                      F-25
<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 25,  1998,  the  Company  is unable to predict  the  outcome of this
       disagreement with its former landlord.



                                      F-26
<PAGE>
       Impact of Year 2000

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

       Based  on  a  preliminary  assessment,   the  Company  believes  that  no
       significant  modifications of 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 determine
       the extent to which the  Company is  vulnerable  to any  failure by third
       party 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 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.


16.    Subsequent Events

       In May  1998,  the  Company  entered  into  an  agreement  (the  "Imatron
       Transaction") with Imatron Inc. ("Imatron"), whereby Imatron will acquire
       a majority ownership of the Company. In conjunction with the execution of
       definitive  agreements,  Imatron began making  working  capital  advances
       available  to the  Company up to $500,000 to enable the Company to meet a
       portion of its current obligations.  As of July 25, 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.

                                      F-27
<PAGE>
       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 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
       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  owns 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  stockholders 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 stockholder approval is obtained.


                                      F-28
<PAGE>
       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.

       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 leins 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
                                                            =====          =====

                                      F-29


                                  EXHIBIT 10.57

                                 LOAN AGREEMENT


     THIS  AGREEMENT  is made as of the  first  day of May  1998 by and  between
POSITRON CORPORATION ("Borrower"),  a Texas corporation with its principal place
of business at 1304 Langham Creek Drive,  Houston,  Texas 77084 and IMATRON INC.
("Lender"), a New Jersey corporation with its principal place of business at 389
Oyster Point Blvd., So. San Francisco, CA 94080.

                                R E C I T A L S:

     WHEREAS,  Borrower has  requested  Lender to make certain loans to Borrower
for working  capital and  certain  other needs as provided  herein and Lender is
agreeable to make such loans upon the terms and conditions hereof;

     NOW  THEREFORE,  in  consideration  of these  premises  and the mutual
covenants and agreements herein contained and other valuable consideration,
the receipt  and  adequacy of which the  parties  hereto  acknowledge,  the
parties have agreed as follows: 

     1. DEFINITIONS.

     As used in  this  Loan  Agreement,  the  following  terms  shall  have  the
following meanings unless the context requires otherwise:

     Borrower's Obligations means all present and future obligations of Borrower
to  Lender  hereunder,  under  the  Note,  or any  other  document  executed  in
connection herewith.

     Default means any event set forth in Section 6.1 hereof.

     Lender's  Obligations means all present and future obligations of Lender to
Borrower hereunder, or any other document executed in connection herewith.

     Loan  Agreement  means this Loan Agreement and all  attachments,  exhibits,
schedules hereto, all as may be amended from time to time.

     Loan Rate means the Prime Rate  listed in the  Western  edition of the Wall
Street  Journal  or,  if not so  listed,  the  reference  rate in use by Bank of
America NS & TA on the final business day of each month,  plus one-half  percent
(1/2 %), as applied to the payment for the next month.

     Payment Dates means the first day of each calendar month.

     2.  LOANS.

     2.1. Lender agrees, on terms and conditions of this Loan Agreement, to make
loans (hereinafter called individually a "Loan" and,  collectively "The Loans"),
to Borrower in an aggregate  principal  amount at any one time outstanding up to
but not exceeding Five Hundred Thousand Dollars  ($500,000).  Within such limit,
and subject to the various  conditions  set forth  herein,  Borrower may borrow,
repay, re-borrow at any time or from time to time from the date hereof up to and
including the earlier of March 1, 2000 and the  termination of the commitment of
Lender, as provided at Section 6.2 below. The obligation of Lender to make Loans
up to but not exceeding such aggregate amount at any one time outstanding herein
is hereinafter called its "Commitment."

     2.2.  Except for the borrowing  contemplated  to be made upon  execution of
this Agreement,  as set forth in Schedule 3.1(g),  Borrower shall give Lender at
least three(3) calendar days' written notice (effective upon receipt) specifying
the  amount  and  date  of each  borrowing  under  Section  2.1.  The  foregoing
notwithstanding, and provided all conditions have otherwise been met, the timing
set forth in Schedule  3.1(g) shall be deemed  written notice of the amounts and
dates set forth in the Schedule.

     2.3.  Borrower's  obligations  to pay the  principal of and interest on the
Loans shall be  evidenced by its grid  promissory  note in the form of Exhibit A
hereto (the "Note")  payable to the order of Lender.  The Note shall reflect the
amount of the  Commitment,  with actual Loans,  repayments and balances noted by
Lender on the grid attached to the Note and made a part thereof.  The Note shall
bear interest on the unpaid principal amount thereof until such principal amount
shall be paid in full at a per annum  rate  equal to the Loan  Rate  (based on a
year of 365 or actual number of days elapsed).  The Loan Rate shall apply to the
average  outstanding  principal balance on the Note during any month which shall
be the summation of the daily  balances  during such month divided by the number
of days in the  particular  month.  Unless  accelerated  in accordance  with the
provisions  of this Loan  Agreement,  the  interest on the Note for any calendar
month shall be paid within  fifteen (15) days of each  consecutive  Payment Date
immediately  following  such calendar  month until full payment of the Loan (and
related interest),  with the first Payment Date being the first day of the month
immediately following execution of this Agreement. All principal and interest on
the Note shall be due and payable in full on March 1, 2000.  If any Payment Date
(or other  date for  payment  hereunder)  falls on a day which is not a business
day, such Payment Date (or other date of payment)  shall be the next  succeeding
business day.

     2.4. Mandatory Repayment. The foregoing  notwithstanding,  beginning on and
after  any date,  from the date of this Loan  Agreement  to the  termination  of
Lender's  Commitment,  that Borrower  receives  third party  financing,  whether
equity or debt ("Financing"), in an amount in excess of One Million U.S. Dollars
($1,000,000)  in the aggregate  ("Financing  Threshold"),  Borrower shall repay,
fifty percent (50%) of each dollar  received above the Financing  Threshold from
such Financing, toward any and all amounts of principal and interest outstanding
under this Loan Agreement until such amounts have been fully repaid and further,
Lender's  Commitment  shall  terminate  and  not be  renewed.  Solely  by way of
example, in the event Borrower shall receive Financing in an aggregate amount of
$750,000 at any time during the first nine (9) months of this Agreement, and six
(6)  months  thereafter  Borrower  receives  additional  Financing  in an amount
$500,000,  Borrower  shall repay to Lender,  promptly  following  receipt of the
$500,000,  the sum of $125,000 representing fifty percent (50%) of all Financing
received  above the  Financing  Threshold,  which amount shall be applied to all
interest  accrued on the Loans and unpaid to that date plus,  to the extent that
accrued unpaid interest constitutes less than $125,000, that amount of principal
outstanding  representing  the  difference  between the amount of accrued unpaid
interest  and  $125,000.  Thereafter,  fifty  percent  (50%) of every  dollar of
additional  Financing  provided to Borrower shall be paid over to Lender, and no
more  Loans  shall be  authorized,  until the full  amount of any and all unpaid
principal and interest on the Loans shall have been paid.

     2.5. All payments to Lender shall be paid by Borrower to Lender at Lender's
address as follows:  Imatron Inc., 389 Oyster Point Blvd., So. San Francisco, CA
94080, Attn. President.  All amounts paid shall be applied first, to the payment
of all interest accrued and payable with respect to the Note; and second, to the
payment of outstanding  principal of the Loan; and third,  following Default, to
the payment of all expenses and charges,  including reasonable  attorneys' fees,
included  by Lender for the  protection  of its rights or the  pursuance  of its
remedies.

     2.6.  The Loans or any part  thereof  may be  prepaid  at any time  without
penalty.

     2.7. The interest and other charges charged with respect to the Loans shall
not exceed the highest rate permissible under any law which a court of competent
jurisdiction  or an  arbitrator  or  panel  of  arbitrators  shall,  in a  final
determination, deem applicable to the Loans. As of the date of execution of this
Loan Agreement, the parties hereto, in good faith, agree that the total interest
and other  charges  payable by Borrower  to Lender  under the terms of this Loan
Agreement do not exceed the maximum legal interest rate applicable to the Loans.
If it is determined  that Lender has received  interest and other  consideration
with respect to the Loans in excess of the highest rate applicable to the Loans,
Lender shall  promptly  refund not more than such excess  amount to Borrower and
the provisions  hereof shall be deemed  amended to provide for such  permissible
rate.

     3.  CONDITIONS OF LENDING.

     The  obligations of Lender to make a Loan is subject to the  fulfillment of
the following conditions:

     3.1. The following documents shall have been duly authorized,  executed and
delivered  by the  Borrower  to the Lender,  and shall be in form and  substance
satisfactory to the Lender and its counsel and shall be in full force and effect
on the date of the Loan.

     Prior to the first Loan:

          (a)     an  executed  Loan  Agreement,  and  all  executed  documents,
                  certificates   and  instruments   contemplated  by  this  Loan
                  Agreement,   including   but  not  limited  to  the   Security
                  Agreement;

          (b)     a certified  copy of the  resolution of the Board of Directors
                  of  Borrower,  certified  by the  Secretary  or a  responsible
                  officer  thereof,  duly  authorizing  execution,  delivery and
                  performance of this Loan  Agreement and the Note  contemplated
                  hereby;

          (c)     a  certificate  of recent date from the  Secretary of State of
                  the  state  of  incorporation  of  Borrower  as  to  its  good
                  standing;

          (d)     an incumbency  certificate of Borrower dated as of the date of
                  funding, as to (i) the person or persons authorized to execute
                  and  deliver  this  Loan  Agreement,  the Note,  the  Security
                  Agreement, and any other documents to be executed on behalf of
                  them in connection with the transactions  contemplated  hereby
                  and (ii) the signature of each person or persons;

          (e)     the executed Note;

          (f)     documentary evidence satisfactory to Lender that any and all
                  liens or other  security  interests on any of  Borrower's
                  tangible or intangible property, including  but not limited to
                  accounts, computer  hardware and software, copyrights,
                  equipment, inventory,  licenses,  patents,  trade secrets,
                  trademarks, general intangibles,  chattel paper or other
                  property, and  all  proceeds  thereof, shall  have  been
                  released  or  otherwise subordinated to Lender's security
                  interests  contemplated herein, except as otherwise provided
                  by that certain agreement by and among ProFutures Bridge
                  Capital Fund, L.P., a Delaware limited partnership
                  ("ProFutures"),  Lender and Borrower, dated as of April 28,
                  1998 and attached hereto as Exhibit D, and except as provided
                  by that  certain  agreement  by and among  Uro-Tech, Ltd.,
                  Lender and Borrower,  dated as of April 28, 1998 and attached
                  hereto as Exhibit E; and

          (g)     an expense  plan and  budget,  including  an  acceptable  cash
                  control system for managing  expenditures  within the plan and
                  budget, ("Expense Plan"), attached hereto as Schedule 3.1(g) ;
                  and

          (h)     documentary evidence satisfactory to Lender that any Letter of
                  Intent or contract  arrangements  of whatever  nature  between
                  Borrower and CTI PET Systems,  Inc.  have expired or otherwise
                  been terminated, and that there are no obligations of whatever
                  nature in effect between Borrower and CTI PET Systems, Inc.

                   For each Loan (including the first):

          (i)     an officer's  certificate in the form of Exhibit B which shall
                  include the written  request from  Borrower  setting forth the
                  requested  amount  of  the  Loan  and  the  proposed  date  of
                  borrowing;

          (j)     for each  Loan  after  the first  Loan,  documentary  evidence
                  satisfactory  to Lender,  including but not limited to Exhibit
                  B, that Borrower is adhering strictly to the Expense Plan; and

          (k)     such other  documents and evidence with respect to Borrower as
                  Lender may reasonably request.

     3.2. On the date of each  borrowing  pursuant to Section 2.1 above,  (i) no
Default  or event  that with the giving of notice or lapse of time or both would
constitute a Default  hereunder  has occurred and is  continuing or would result
from the  performance of this Loan  Agreement,  (ii) no material  adverse change
shall  have  occurred  since the date of this Loan  Agreement  in the  financial
condition or operations  of the Borrower,  and (iii) there shall be no juridical
proceeding or regulatory  action  instituted by or against the Borrower,  or, to
the best of Borrower's knowledge,  any threatened proceeding or action which may
materially  adversely  affect the business,  property,  operation,  or financial
condition of the Borrower.  By acceptance of a Loan,  Borrower  represents as of
such  Loan  date,  that  each of the  foregoing  items  is true.  The  foregoing
notwithstanding,  Lender  acknowledges that it has been advised of the status of
Borrower's lease for space located at 1304 Langham Creek Drive,  #310,  Houston,
Texas 77084, as set forth on Schedule 4.5 herein,  and that such status will not
be deemed a breach of this Section 3.2.

     4.   REPRESENTATIONS AND WARRANTIES.

     4.1.     Borrower is a corporation duly organized and validly existing
 in good standing under the laws of the state
of Texas.

     4.2.  Borrower has full corporate power to own its properties,  to carry on
its business as now being  conducted  and has full  corporate  power to execute,
deliver and perform all of its  obligations  under this Loan  Agreement  and the
Note.

     4.3.  The  execution,  delivery  and  performance  by Borrower of this Loan
Agreement,   the  Note,  the  Security   Agreement  and  all  related  documents
contemplated  by this  transaction  have been duly  authorized  by all necessary
corporate  action of Borrower and do not violate any provision of law,  statute,
rule or regulation,  applicable to Borrower, or any judgment, franchise, permit,
order,  decree,  ruling, writ or injunction of any court or administrative body,
applicable to Borrower, or of Borrower's  certificate of incorporation,  by-laws
or the terms of any of its  securities or result in the breach of, or constitute
a Default under, or require any consent under, any indenture,  bank loan, credit
agreement or other  agreement or instrument  to which  Borrower is a party or by
which Borrower or any of its property may be bound or affected.

     4.4. No filings, recordations, notifications, registrations, notarizations,
authentications  or other  formalities  or property,  stamp or similar  taxes or
duties  and  no  approvals,  licenses,  orders,   authorizations,   consents  or
undertakings of any governmental bodies or regulatory,  supervisory  authorities
are necessary in connection  with the  execution,  delivery and  performance  by
Borrower of this Loan Agreement or the Note, or for the payment to Lender of all
sums hereunder or under the Note or for the legality,  validity,  binding effect
or enforceability hereof or thereof.

     4.5. Except as disclosed and described in Schedule 4.5 hereto, Borrower has
good and  marketable  title to, or a valid  leasehold  interest in, the tangible
personal  property or other  properties  and assets  used by it,  located on its
premises, or shown on the most recent balance sheet, free and clear of all liens
or other security interests.

     4.6.  This Loan  Agreement  and the  Note,  have  been  duly  executed  and
delivered by Borrower and are legal, valid and binding  obligations of Borrower,
enforceable in accordance with their respective terms, subject to (i) the effect
of any applicable bankruptcy,  insolvency,  reorganization,  moratorium or other
similar laws affecting the enforcement of creditors' rights generally,  (ii) the
availability  of the remedies of specific  performance  or injunctive  relief as
subject  to the  discretion  of the court  before  which a  proceeding  for such
remedies  may be brought,  and (iii) the  exercise by any court before which any
proceeding may be brought of equitable judicial discretion.

     4.7.  Borrower has delivered to Lender its  unaudited  balance sheet of the
Borrower and the related  statements of income,  retained earnings and cash flow
of Borrower  (collectively  "Financial  Statements")  for the nine month  period
ending  September 30, 1997. Such balance sheet and statement  fairly present the
financial  condition  of the  Borrower  as of such date and the  results  of the
operations of the Borrower for the period ended on such date, and such statement
has been prepared in accordance with generally  accepted  accounting  principles
consistently applied, and contain any disclosure that would normally be required
by  financial   statements   prepared  in  accordance  with  generally  accepted
accounting  principles.  Since the end of the period reflected in such financial
statements  there  has been no  material  adverse  change in such  condition  or
operations.

     4.8. Except as disclosed and described on Schedule 4.8,  Borrower has filed
all  applicable  tax  returns  required  to be filed by it, and has paid or made
provisions  for the payment of all taxes which have become due  pursuant to said
returns or pursuant to any assessment received by Borrower except such taxes, if
any, as are being contested in good faith and as to which adequate reserves have
been provided in accordance with generally accepted accounting  principles,  and
warrants that such returns properly  reflect the United States,  state and local
income and tax liability of the Borrower for the period covered thereby.

     4.9.  Except as disclosed and fully  described on Schedule 4.9, there is no
action,  suit  or  proceeding  pending  or,  to the  knowledge  of the  Borrower
threatened,  against  the  Borrower  or any of its  property  before  any court,
governmental department, administrative agency or instrumentality which, if such
action,  suit or proceeding were adversely  determined,  would materially affect
the  financial  condition  or the results of  operations  of the Borrower or its
business or the ability of the Borrower to perform its obligations hereunder.

     4.10.  Except as disclosed and described on Schedule 4.10 hereto,  Borrower
is not in  default  on or has  otherwise  delayed  or  postponed  payment of any
accounts payable or other  liabilities in excess of $25,000 outside the ordinary
course of business.

     4.11.  Each Loan shall be fully applied by Borrower  solely for its working
capital  needs or for the  purchase  of  equipment  or  leasehold  improvements,
consistent with Schedule  3.1(g) and the Cash Control  System,  and for no other
purpose.

     4.12.  No broker or finder  acting on behalf of Borrower  brought about the
obtaining,  making  or  closing  of this  Loan  Agreement  and  Borrower  has no
obligation  to pay any  finder's  or  brokerage  fees  in  connection  with  the
transactions contemplated herein.

     4.13.  As of the date of execution of this Loan  Agreement,  the  aggregate
interest and other charges payable by Borrower to Lender under the terms of this
Loan Agreement do not exceed the maximum legal  interest rate  applicable to the
Loans.

     5.   COVENANTS.

     Borrower  hereby  covenants and agrees that until  satisfaction  of all its
obligations, it shall:

     5.1.  Preserve and maintain its corporate  existence and all of its rights,
privileges and franchises,  and continue the conduct of its present  business in
an orderly,  efficient and regular manner;  comply in all material respects with
all  applicable  laws,  rules,   regulations  and  orders  of  any  governmental
authority,  non-compliance  with which  would  materially  affect the ability of
Borrower to perform its obligations.

     5.2. Make payments or  commitments  for payments only in strict  compliance
with the Expense Plan and Cash Control  System,  or otherwise as  authorized  by
Lender.

     5.3. Furnish Lender promptly with any financial  information or statements,
and other current information  regarding or relating to Borrower,  as reasonably
requested by Lender, other than information  relating to Borrower's  proprietary
know-how and technology information.

     5.4. Timely file any and all tax returns and tax filings required under any
governmental  statute or regulation and timely pay and discharge,  when due, all
tax  obligations,  and  material  obligations  to third  parties,  except  those
obligations  being  contested in good faith,  and for which  Borrower shall have
maintained,   in  accordance  with  generally  accepted  accounting  principles,
adequate reserves for the payment of the same.

     5.5.  Notify  Lender  immediately  upon  receipt  of  notice  of any  lien,
attachment,  administrative or judicial proceeding, pending or threatened claim,
dispute,  litigation  or  governmental  proceedings,  material to the  financial
condition or operations of Borrower,  which for this purpose shall be any amount
in excess of $ 10,000; provide immediate written notice to Lender of any Default
or event  which  with the  lapse  of time or  giving  of  notice  or both  would
constitute a Default.

     5.6.  Promptly  and  duly  execute  and  deliver  to  Lender  such  further
documents, instruments and assurances and take such further action as Lender may
from  time to time  reasonably  request  in order to carry  out the  intent  and
purpose of this Loan  Agreement  and to  establish  and  protect  the rights and
remedies created or intended to be created in favor of Lender hereunder.

     5.7.  Reimburse  Borrower  for its costs  and  reasonable  attorneys'  fees
incurred in enforcing its rights pursuant to the provisions of this Agreement.

     6.   DEFAULTS AND REMEDIES.

     6.1. Any of the following shall constitute a default by Borrower  hereunder
("Default"):  (a) failure by Borrower to pay any amounts  hereunder or under any
Note when due and such remains unremedied for a period of fifteen (15) days from
the due date;  or (b)  failure of  Borrower  to comply  with any  provisions  or
perform any of its  obligations  arising under this Loan  Agreement  (other than
those  referred  to in clause (a) above),  or if, but only if,  such  failure to
comply is remediable, it remains unremedied by Borrower for a period of ten (10)
days from notice to Borrower;  or (c) any  representations or warranties made or
given  by  Borrower  in  connection  with  this  Loan  Agreement  were  false or
misleading  when made,  in any  material  way; or (d)  subjection  of any of the
assets in an amount in excess of  $10,000.00  of Borrower to  attachment,  levy,
execution,  forfeiture  or  cancellation  or other  administrative  or  judicial
process which is not or cannot be removed with reasonable diligence within sixty
(60) days from the subjection  thereof,  or (e)  commencement of any insolvency,
bankruptcy  or  similar  proceedings,  by or  against  Borrower,  including  any
assignment  by  Borrower  for the benefit of  creditors,  and in the case of any
involuntary  proceedings,  such is not  dismissed  within  ninety  (90)  days of
institution;  or the  inability of Borrower to pay its debts as they become due;
or (f) the  liquidation or dissolution  of Borrower or the  commencement  of any
acts relative thereto,  or without the prior written consent of Lender, any sale
or other disposition of all or substantially  all of the assets of Borrower,  or
any merger or  consolidation  of  Borrower,  or the  cessation  of  business  by
Borrower; or (g) a default by Borrower under any agreement for borrowed money or
under any lease,  except with  regard to the lease of premises  located at 16350
Park Ten Place,  Houston,  Texas 77084, whereby the holder of the obligation has
accelerated it prior to its stated maturity and such accelerated  amount exceeds
$100,000.00,  except as otherwise disclosed on Schedule 4.10; or (h) there shall
be a money judgment,  in excess of $25,000.00  entered against Borrower which is
not fully  covered by  insurance  or remains  unvacated,  unbonded,  unstayed or
undischarged for more than sixty (60) days.

     6.2.  Upon any  default,  Lender,  upon  written  notice to  Borrower,  may
exercise any one or more of the  following  remedies  (which  remedies  shall be
cumulative to the extent permitted by law): (a) terminate any further obligation
of Lender  hereunder  (including  any  obligation  to make further  loans);  (b)
declare the remaining  unpaid  principal  balances of the Note, plus all accrued
but unpaid interest thereon, plus all other amounts due from Borrower hereunder,
immediately  due and payable in full without  notice or demand,  whereupon  such
shall become due and  payable;  (c) exercise any other right or remedy which may
be available to it under applicable law; or (d) require the Borrower to purchase
from Lender,  and Borrower  shall have the  obligation  to purchase  from Lender
("Put")  any, or all, or less than all, of any shares of common  stock issued by
Borrower  and owned by Lender at the price of $ 0.01 per  share.  Upon a default
any  proceeds  received  from  Borrower  shall  be  applied  by  Lender  to  the
obligations, in the order of application as Lender shall elect.

     7.   NOTICES; CHANGES.

     Notices,  requests or other communications required hereunder to be sent to
either party shall be in writing and shall be by: (a) United  States first class
mail, postage prepaid, and addressed to the other party at the address set forth
above (or to such other  address as such party shall have  designated  by proper
notice),  effective  five days  after  deposit;  (b) by  personal  or  overnight
delivery, effective upon receipt.

     8.   GOVERNING LAW.

     This Loan Agreement  shall be governed and construed in accordance with the
laws of the State of  California  without  giving  effect to the  principles  of
conflict of laws thereof.

     9.   DISPUTE RESOLUTION.

     9.1. Any  controversy or claim between or among the parties  arising out of
or relating to this Loan  Agreement  or any related  agreements  or  instruments
("Subject  Documents"),  including any claim based on or arising from an alleged
tort,  shall be  submitted  to and  determined  by  arbitration  before  one (1)
arbitrator  who shall be an attorney  admitted  to practice  law in the state of
California,  in  accordance  with  Title 9 of the U.S.  Code and the  Commercial
Arbitration  Rules  of the  American  Arbitration  Association  ("AAA")  then in
effect,  and shall be held in the county of San  Francisco,  CA. All statutes of
limitations  which would otherwise be applicable  shall apply to any arbitration
proceeding under this  subparagraph 9.1. Judgment upon the award rendered may be
entered in any court having jurisdiction. This subparagraph 9.1 shall apply only
if, at the time of the proposed  submission to AAA, none of the  obligations  to
Lender  described in or covered by any of the Subject  Documents  are secured by
real  property  collateral  or,  if so  secured,  all  parties  consent  to such
submission.

     9.2.  If the  controversy  or  claim is not  submitted  to  arbitration  as
provided  and  limited in Section  9.1,  but  becomes  the subject of a judicial
action,  any party may elect to have all decisions of fact and law determined by
a referee in accordance with applicable  state law. If such an election is made,
the parties shall  designate to the court a referee or referees  selected  under
the  auspices  of the AAA in the same  manner as  arbitrators  are  selected  in
AAA-sponsored proceedings. The referee, or presiding referee of the panel, shall
be an active  attorney or retired judge.  Judgment upon the award rendered shall
be entered in the court in which such proceeding was commenced.

     9.3.  Except as provided  herein,  no provision  of, or the exercise of any
rights under,  Section 9.1,  shall limit the right of any party to exercise self
help remedies such as setoff,  or to obtain  provisional  or ancillary  remedies
such as injunctive  relief or the  appointment of a receiver from a court having
jurisdiction  before,  during  or after the  pendency  of any  arbitration.  The
institution  and  maintenance  of an action  for  judicial  relief or pursuit of
provisional  or ancillary  remedies or exercise of self help remedies  shall not
constitute  a waiver of the right of any  party,  including  the  plaintiff,  to
submit the controversy or claim to arbitrators.

     9.4.  The  parties  understand  and  agree  the  arbitration  will be their
exclusive form of resolving  disputes  between them regarding the issues covered
by this Agreement.  BOTH PARTIES EXPRESSLY WAIVE THEIR  ENTITLEMENT,  IF ANY, TO
HAVE CONTROVERSIES BETWEEN THEM DECIDED BY A JURY OR COURT OF LAW.

     10.   MISCELLANEOUS.

     This Loan  Agreement  or any part  hereof,  may not be assigned by Borrower
without the written consent of Lender and shall be binding upon and inure to the
benefit of the parties hereto, their legal representatives, permitted successors
and  assigns.  This Loan  Agreement  and/or the note or any part  thereof may be
assigned by Lender without the consent of Borrower. No amendment hereunder shall
be  effective  unless in  writing  signed by the  parties  hereto  and no waiver
hereunder  shall be  effective  unless  in  writing,  signed  by the party to be
charged.  No  failure  to  exercise,  no delay in  exercising,  and no single or
partial exercise on the part of Lender of any right, remedy, or power hereunder,
shall operate as a waiver thereof or preclude  Lender from  exercising any other
right,  remedy or power  hereunder.  Any provision of this Loan Agreement or the
Note which is unenforceable in any jurisdiction  shall, as to such jurisdiction,
be ineffective to the extent of such  prohibition or  unenforceability,  without
invalidating   the   remaining   provisions   hereof   or  of  the   note.   The
representations,  warranties,  obligations  and  indemnities of Borrower  herein
shall survive the  termination of this Loan Agreement to the extent required for
their full observance and  performance.  The obligation of each comaker (if any)
of this Loan Agreement or the Note shall be primary,  joint and several and each
such comaker  hereby  irrevocably  consents to any extension of time of payments
and/or the execution of any refinancing or restructuring  agreements relative to
this  Loan  Agreement  or the  Note.  In the  event  Borrower  fails to meet any
obligation of it hereunder, Lender may at its option satisfy such obligation and
Borrower shall reimburse  Lender on demand  therefor.  The captions in this Loan
Agreement  are for  convenience  only and shall  not  define or limit any of the
terms hereof.  This Loan Agreement may be executed in counterparts  and all said
counterparts  taken  together  shall be  deemed to  constitute  one and the same
instrument.

     THIS LOAN IS SECURED BY THE TERMS OF THAT  CERTAIN  SECURITY  AGREEMENT  OF
EVEN DATE BY AND  BETWEEN  BORROWER  AND LENDER  HEREUNDER,  ATTACHED  HERETO AS
EXHIBIT C.

     IN  WITNESS  WHEREOF,  the  parties  hereto  have duly  executed  this Loan
Agreement as of the date first above written.  Borrower  acknowledges  that this
Loan  Agreement  shall not be effective  until accepted by Lender at its address
above.

LENDER:                                  BORROWER:


IMATRON INC.                             POSITRON CORPORATION


By:    /s/ S. Lewis Meyer                By:    /s/ Gary B. Wood
   -----------------------------            --------------------------------
Its:   President/CEO                     Its:   Chief Executive Officer
   -----------------------------            ---------------------------------


Attest:                                   Attest:


By:    /s/ Gary H. Brooks                 By:    /s/ Howard R. Baker
   -----------------------------             --------------------------------

Its:   CFO                                Its:   Executive Vice President
    ----------------------------              -------------------------------


                                  EXHIBIT 10.59
                            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:

         (a) The  affirmative  covenants  of Buyer as  described  in  Section 10
             herein.

         (b) 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.

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

         4.2.  Each  certificate  representing  Shares will be endorsed with the
following legend:

         (a) 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."

         (b) 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.

         4.3.  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,  (a) in accordance  with Section 4.2(a) hereof,
(b) 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 (c) 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:

         5.1.  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.

         5.2.  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.

         5.3.  Financial  Statements.  Attached  hereto as Exhibit A are:  (a) 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 (b) 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 (i)
are true and  correct  and in  accordance  with the books and records of Seller,
(ii) present fairly the financial condition of Seller at the balance sheet dates
and the results of its operations for the periods therein  specified,  and (iii)
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.

         5.4.  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.

         5.5.  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.

         5.6.  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.

         5.7.  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.

         5.8. 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.

         5.9. 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.

         5.10. 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.

         5.11. 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:

         6.1.  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 (a)
registration  under the Securities Act and any applicable state securities laws,
or (b) an exemption from the  requirements  of the Securities Act and applicable
state securities laws.

         6.2. 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.

         6.3. 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.

         6.4. 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.

         7.1. 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.

         7.2.  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.

         7.3.  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.

         7.4. 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.

         7.5.  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.

         7.6. 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.

         7.7. Board Resignations.  (a) 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. (b) 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.

         8.1. 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.

         8.2. 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.


         8.3.  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:

         9.1.  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.

         9.2. 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.

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

         (a) 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;

         (b) 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;

         (c) 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

         (d) at least 20 days prior to the earlier of (i) 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 (ii) 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.

         9.4.  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:

         10.1.  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.

         10.2. 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.

         10.3.  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:  (a)  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 (b) 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
(c) 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  (d)  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:

         12.1.  Rights to  Registration.  (a) 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 (i)
promptly give written notice to Buyer of its intention to file such registration
statement and (ii) 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. (b) 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:  (i) 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;  (ii) 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 (iii)  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.

         12.2.  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.

         12.3.  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.

         12.4.  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.

         12.5.  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. (a) 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.  (b) 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

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.

         IN WITNESS  WHEROF,  the parties  execute this Agreement as of the date
first written above.

SELLER:                                 BUYER:
POSITRON CORPORATION                    IMATRON INC.



By: /s/ Gary B. Wood                    By: /s/ S. Lewis Meyer
Its: Chief Executive Officer            Its:  President/CEO


ATTEST:                                 ATTEST:



By: /s/ Howard R. Baker                 By: /s/ Gary H. Brooks
Its: Executive Vice President           Its:  CFO

                                    EXHIBIT A

                                TO LOAN AGREEMENT


                                 PROMISSORY NOTE


U.S.$500,000.00                                                May 1, 1998

                                                     San Francisco, California


     The undersigned POSITRON  CORPORATION,  a corporation organized and validly
existing  under  the laws of the  State of Texas,  for  value  received,  hereby
unconditionally  promises to pay to the order of IMATRON INC.  (the  "Payee") at
389 Oyster  Point Blvd.,  So. San  Francisco,  CA 94080,  in lawful money of the
United  States of America and in  immediately  available  funds,  the  principal
amount of FIVE HUNDRED THOUSAND U.S. DOLLARS,  or, if less, the aggregate unpaid
principal  amount of all Loans (as more fully shown on the grid attached  hereto
and made a part hereof),  with interest on the principal amount hereof remaining
from time to time  unpaid at such  interest  rates and  payable at such times as
provided in the Loan Agreement.  Notwithstanding the foregoing,  Borrower hereby
authorizes  Lender  to record  and  adjust,  on the grid  attached  hereto,  the
principal amount of Loans, principal payments and balances by Borrower under the
Loan Agreement.

     This Note evidences Loans by the Payee to the  undersigned  pursuant to the
Loan  Agreement  between the  undersigned  and the Payee dated as of April ____,
1998  (the  "Loan  Agreement")  as from time to time may be  amended,  restated,
replaced, supplemented,  substituted for or renewed, and the holder of this Note
is entitled to the benefits thereof. Each term defined in the Loan Agreement and
not otherwise defined herein shall have the same definition when used herein.

     The principal  hereof (together with any accrued but unpaid interest) shall
become  forthwith  due and payable as provided in the Loan  Agreement.  Payments
hereunder  not  made  when due  shall  bear  interest  as  provided  in the Loan
Agreement.  Rights of Borrower,  if any, to prepay the Note are set forth in the
Loan Agreement.

     All payments made pursuant to the terms of this Note shall be made free and
clear of, and without deduction for, withholding,  setoff or counterclaim of any
kind.

     Neither  the  failure on the part of the holder of this Note in  exercising
any right or remedy nor any single or partial  exercise  or the  exercise of any
other right or remedy shall operate as any waiver. No amendment  hereunder shall
be effective unless in writing signed by the undersigned and holder of this Note
and no waiver  hereunder  shall be  effective  unless in writing,  signed by the
party  to  be  charged.  The  undersigned  hereby  waives  demand  for  payment,
presentment,  protest and notice of any kind in  connection  with the  delivery,
acceptance, performance, default or enforcement of this Note and hereby consents
to any extensions of time, renewals, releases of any party to this Note, waivers
or modifications  that may be granted or consented to by the holder of this Note
in respect of the time of payment or any other  matter.  Anything  contained  in
this Note to the  contrary  notwithstanding,  in the event  that any  payment of
interest  hereunder shall exceed the legal limit,  such amount in excess of such
limit shall be deemed a payment of principal hereunder.

     The terms and  provisions  hereof  shall  inure to the  benefit  of, and be
binding upon,  the  respective  successors  and assigns of the  undersigned  and
Payee. THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH THE LAWS
OF THE STATE OF CALIFORNIA  WITHOUT  GIVING EFFECT TO THE PRINCIPLES OF CONFLICT
OF LAWS THEREOF.

     IN WITNESS  WHEREOF,  the undersigned has caused this Promissory Note to be
executed  by its  authorized  representative,  who  certifies  that  he has  all
necessary authority on behalf of the undersigned to execute this Promissory Note
and bind the undersigned to the terms hereof.


                              POSITRON CORPORATION


                              By:
                                 --------------------------------

                              Its:
                                  -------------------------------

ATTEST:                       By:
                                 --------------------------------

                              Its:
                                  -------------------------------

<TABLE> <S> <C>

<ARTICLE>                     5
<LEGEND>
The schedule  contains  summary  financial  information  extracted from Positron
Corporation's  consolidated  condensed  statements  of income  and  consolidated
condensed  balance  sheets and is qualified in its entirety by reference to such
financial statements.
</LEGEND>
<CIK>                                         0000844985
<NAME>                                        Positron Corporation
<MULTIPLIER>                                  1,000
<CURRENCY>                                    U.S. Dollars
       
<S>                                           <C>
<PERIOD-TYPE>                                 Year
<FISCAL-YEAR-END>                             Dec-31-1997
<PERIOD-START>                                Jan-01-1997
<PERIOD-END>                                  Dec-31-1997
<EXCHANGE-RATE>                               1
<CASH>                                        160
<SECURITIES>                                  0
<RECEIVABLES>                                 1480
<ALLOWANCES>                                  1227
<INVENTORY>                                   408
<CURRENT-ASSETS>                              952
<PP&E>                                        2419
<DEPRECIATION>                                1704
<TOTAL-ASSETS>                                1667
<CURRENT-LIABILITIES>                         6535
<BONDS>                                       0
                         0
                                   1620
<COMMON>                                      51
<OTHER-SE>                                    (6784)
<TOTAL-LIABILITY-AND-EQUITY>                  1667
<SALES>                                       1129
<TOTAL-REVENUES>                              3526
<CGS>                                         2543
<TOTAL-COSTS>                                 7457
<OTHER-EXPENSES>                              190
<LOSS-PROVISION>                              0
<INTEREST-EXPENSE>                            334
<INCOME-PRETAX>                               (4455)
<INCOME-TAX>                                  0
<INCOME-CONTINUING>                           (4455)
<DISCONTINUED>                                0
<EXTRAORDINARY>                               0
<CHANGES>                                     0
<NET-INCOME>                                  (4455)
<EPS-PRIMARY>                                 (0.91)
<EPS-DILUTED>                                 (0.91)
        

</TABLE>


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