Filing pursuant to Rule 424(b) (3)
                                            Registration Statement No. 333-63782


                 PROSPECTUS SUPPLEMENT NO. 4 DATED JUNE 4, 2004

                     (TO PROSPECTUS DATED NOVEMBER 1, 2001)

                                 454,875 SHARES

FONAR CORPORATION

                                  COMMON STOCK

This prospectus supplement covers 454,875 shares of the 9,900,000 shares covered
by the prospectus dated November 1, 2001 and the registration statement of which
it is a part.  This  prospectus  supplement  relates to a change in the exercise
price under and the number of shares covered by the Purchase Warrants previously
issued by us to Roan/Meyers  Associates,  L.P.,  Imtiaz Khan and Bruce Meyers on
May 24, 2001 in connection  with a financing  transaction  pursuant to which The
Tail Wind Fund Ltd.  provided Fonar Corporation $4.5 million payable pursuant to
a 4%  Convertible  Debenture.  Roan/Meyers  Associates,  L.P.,  was  entitled to
receive a Purchase  Warrant  covering  300,000  shares of our  common  stock for
services in  connection  with  locating The Tail Wind Fund Ltd. as the financing
source. At the request of Roan/Meyers Associates,  L.P., we divided the Purchase
Warrant  covering 300,000 shares of our common stock to which they were entitled
into three Purchase Warrants covering 100,000 shares which we issued each of the
present  holders.  Each Purchase Warrant as amended and restated on June 1, 2004
covers  151,625  shares of our common  stock at an  exercise  price of $0.79 per
share.  See "Purchase  Warrants" below for a more detailed  description of these
changes and the Purchase Warrants.

You  should  read  this  prospectus   supplement  along  with  the  accompanying
prospectus and prospectus  supplement.  These documents contain  information you
should  consider when making your investment  decision.  You should rely only on
information contained or incorporated by reference in this prospectus supplement
and  the  accompanying  prospectus  and  prospectus  supplement.   We  have  not
authorized anyone else to provide you with different or additional  information.
You should not assume that the  information  in this  prospectus  supplement  is
accurate as of any date other than the date on the front of this  document.  The
first two supplements concerned only the original Callable Warrant issued to The
Tail Wind Fund Ltd., which Callable Warrant has been exercised in full.

This  prospectus  supplement  and the  accompanying  prospectus  and  prospectus
supplement do not constitute an offer to sell or a  solicitation  of an offer to
buy any securities  other than the common stock offered hereby.  This prospectus
supplement and the  accompanying  prospectus  and  prospectus  supplement do not
constitute  an offer  to sell or a  solicitation  of an offer to buy our  common
stock in any circumstances in which an offer or solicitation is unlawful.

INVESTING IN OUR COMMON STOCK INVOLVES A HIGH DEGREE OF RISK. SEE "RISK FACTORS"
BEGINNING ON PAGE 4 OF THE PROSPECTUS.

NEITHER  THE  SECURITIES  AND  EXCHANGE  COMMISSION  NOR  ANY  STATE  SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS  IS TRUTHFUL OR  COMPLETE.  ANY  REPRESENTATION  TO THE CONTRARY IS A
CRIMINAL OFFENSE.

                              SELLING STOCKHOLDERS
                                PURCHASE WARRANT

On May 24, 2001, we issued Purchase  Warrants to Roan/Meyers  Associates,  L.P.,
Imtiaz Khan and Bruce Meyers covering 100,000 shares each of our common stock at
an  exercise  price of $1.801 per share,  subject to  adjustment.  The  Purchase
Warrants were issued as a fee for services  rendered by Roan/Meyers  Associates,
L.P. in connection  with obtaining the financing  transaction  pursuant to which
The Tail Wind Fund Ltd.  provided  Fonar  with  $4.5  million  pursuant  to a 4%
Convertible  Debenture.  In the  absence of a  conversion  by The Tail Wind Fund
Ltd.,  Fonar had the option of paying  the  Debenture  in stock or cash.  At the
request of Roan/Meyers  Associates,  L.P., Fonar issued three Purchase  Warrants
covering  100,000 shares each to the Warrant holders instead of a single warrant
to Roan/Meyers Associates, L.P. covering 300,000 shares of our common stock.

The Purchase  Warrants  contained  antidilution  provisions,  which provided for
proportionate  adjustments  in the event of stock  splits,  stock  dividends and
reverse stock splits. In addition, the antidilution provisions provided that the
exercise  price  would be reduced if we issued  shares at lower  prices than the
warrant  exercise  price,  or less than the market  price for our common  stock.
Where the effective per share selling price in connection  with stock  issuances
by Fonar was less than the exercise  price,  the exercise price would be reduced
to such lower price.  The Purchase  Warrants  also  provided  that the number of
underlying shares would be inversely  proportionately  increased or decreased in
the event of a change in the exercise  price,  such that the aggregate  purchase
price for the  underlying  warrant  shares upon full  exercise of each  Purchase
Warrant would remain the same. In brief, a reduction of the exercise price would
increase the shares covered by each of the Purchase Warrants.

Since issuing the Purchase  Warrants,  we have  registered  shares of our common
stock and issued them to suppliers of goods and services in lieu of cash.  Under
those  arrangements,  our  suppliers  would credit us for the net proceeds  they
received from the sale of the shares we issued to them. The market price for our
common stock was under the $1.801  exercise  price of the  Purchase  Warrants at
many times  during our  program  of paying  vendors  with stock in lieu of cash.
Consequently,  we were  credited by our  suppliers at rates below the $1.801 per
share exercise price under the Purchase Warrants.

On June 1,  2004,  the  holders  of the  Purchase  Warrants  and Fonar  executed
amendments  to the  Purchase  Warrants,  providing  that the  number  of  shares
underlying  each Warrant  would be 151,625  shares and that the  exercise  price
would be $0.79 per share.  Although the new  exercise  price was  determined  in
accordance  with the  Warrants  as a result of the vendor  issuances  previously
described,  the number of underlying shares represented an agreement on the part
of the Warrant  holders to accept an adjustment  representing a lesser number of
shares than would have  resulted from the strict  application  of the formula in
the  Purchase  Warrants.  In  addition,  among other  things,  the  antidilution
provisions  were  amended to provide that if Fonar were to sell shares below the
Warrant exercise price, the exercise price would not automatically be reduced to
the lower price,  but that it would be adjusted based on the price and number of
shares sold relative to the total number of shares  outstanding before and after
the sale. In addition, the provision that required an adjustment in the exercise
price if Fonar  sold  shares  below  the  market  price  was  eliminated.  These
modifications  were accepted by the Warrant holders in consideration  for, among
other things,  the term of the Purchase  Warrants  being extended three years to
May 24, 2009.

None of the Purchase Warrant shares have been exercised.  We do not know or have
any indication from the Warrant  holders as to when they may exercise,  in whole
or in part, the Purchase Warrants.

                                 USE OF PROCEEDS

We intend to use any net proceeds from the exercise of the Purchase Warrants for
general  corporate  purposes,  including  working  capital  to fund  operations,
expenses and capital expenditures. As of the date of this prospectus supplement,
we cannot specify with certainty the particular uses for the net proceeds we may
receive upon the exercise of the Purchase Warrants.  Accordingly, our management
will have broad  discretion  in the  application  of any net proceeds  received.
Pending  such uses,  we  currently  expect that we would invest the net proceeds
from the  exercise of the  Purchase  Warrants in  short-term,  interest-bearing,
investment grade securities.


                           MARKET FOR OUR COMMON STOCK

Our  common  stock is listed on the  NASDAQ  Small Cap  Market  under the symbol
"FONR".  On June 2, 2004 our  closing  price of one  share of  common  stock was
$1.23. As of the close of business on June 1, 2004, we had 98,024,059  shares of
common stock outstanding.

                       WHERE YOU CAN FIND MORE INFORMATION

The SEC allows us to  "incorporate by reference"  information  that we file with
them, which means that we can disclose important information to you by referring
you  to  those  documents.  The  information  incorporated  by  reference  is an
important part of this prospectus supplement and the accompanying prospectus.

The  documents we  incorporate  by reference  and where you can find  additional
filings  and  information  concerning  Fonar  are set  forth  in the  prospectus
beginning on page 16.