AMERICAN SHARED HOSPITAL SERVICES REPORTS 13% INCREASE IN OPERATING INCOME AND 19% INCREASE IN PRE-TAX INCOME ON 13% INCREASE IN RADIOSURGERY REVENUE TO A NEW RECORD Net Income Increased 10% to $0.09 Per Share Despite Hi

AMERICAN SHARED HOSPITAL SERVICES REPORTS

13% INCREASE IN OPERATING INCOME AND 19% INCREASE IN PRE-TAX INCOME

ON 13% INCREASE IN RADIOSURGERY REVENUE TO A NEW RECORD

Net Income Increased 10% to $0.09 Per Share Despite Higher Tax Rate

San Francisco, CA, May 4, 2006 AMERICAN SHARED HOSPITAL SERVICES (AMEX,PCX:AMS), the leading

provider of Gamma Knife radiosurgery services, today announced solid increases in revenue and

income for the first quarter of 2006 compared to the same quarter of 2005.

Driven by the three new Gamma Knife units we placed during 2005 and strong volume at several of

our other centers, revenue increased 13% to a new first quarter record for radiosurgery services

and exceeded the $5 million benchmark for the first time in our history. This growth, combined

with our continued effective management of costs, contributed to the 21st consecutive quarterly

increase in operating income, a key metric of our performance, and to an increase in net income

despite a higher effective tax rate, said Ernest A. Bates, M.D., Chairman and Chief Executive

We expect new contracts for our radiation therapy equipment offerings, as well as our proprietary

Operating Room for the 21st Century concept, to support further revenue and earnings gains over the

next few years. Longer term, our recently announced equity investment in Still River Systems

positions us to complement these sources of growth with what we believe will be the next major

advance in radiation oncology proton beam radiation therapy (PBRT). We also acquired an option

to purchase two Clinatron-250 PBRT systems from Still River Systems for anticipated delivery in

2008. With our strong positions in current and next generation technology, we are confident that

AMS has the right strategy for sustained success, Dr. Bates added.

First Quarter Results

For the three months ended March 31, 2006, revenue increased 13% to $5,045,000 compared to revenue

of $4,449,000 for last year s first quarter. Operating income increased 13% to $946,000 from

$836,000 a year earlier, and pre-tax income increased 19% compared to the first quarter of 2005.

Net income for first quarter of 2006 increased 10% to $436,000, or $0.09 per diluted share. This

compares to net income for first quarter 2005 of $395,000, or $0.08 per diluted share. The

effective tax rate for this year s first quarter increased to 39% from 35% for the first quarter of

At March 31, 2006, AMS reported working capital of $4,778,000, cash, cash equivalents and

short-term securities of $7,829,000, and long-term securities of $601,000. At December 31, 2005,

working capital was $2,423,000, cash, cash equivalents and short-term securities were $5,835,000,

and long-term securities were $2,797,000. Shareholders equity increased to $18,526,000 compared

to $18,320,000 at December 31, 2005.

Earnings Conference Call

American Shared has scheduled a conference call at 4:00 pm EDT (1:00 pm PDT) today. To participate

in the live call, dial 800-661-2653 at least 5 minutes prior to the scheduled start time. A

simultaneous WebCast of the call may be accessed through the Company s website,

www.ashs.com, or through CCBN, www.streetevents.com. A replay will be available

for 30 days at these same internet addresses, or by calling 888-843-8996, pass code 14572676.

American Shared Hospital Services is building a profitable medical services company in an

underserved niche turnkey technology solutions for advanced radiosurgical procedures. The

Company s core business is supplying hospitals with the Gamma Knife a non-invasive treatment for

malignant and benign brain tumors, vascular malformations and trigeminal neuralgia (facial pain).

The Gamma Knife, the gold standard in radiosurgery, reduces surgical risk and patient discomfort,

resulting in a shorter hospital stay and lower risk of complications. In most cases, Gamma Knife

patients resume their normal activities within a few days of treatment, compared to weeks or months

for patients who undergo conventional

surgery. More than 300,000 patients worldwide have already received this treatment. American

Shared Hospital Services is the world leader in providing Gamma Knife radiosurgery services.

Safe Harbor Statement

This press release may be deemed to contain certain forward-looking statements with respect to the

financial condition, results of operations and future plans of American Shared Hospital Services,

which involve risks and uncertainties including, but not limited to, the risks of the Gamma Knife

business, the risks of developing the Company s IMRT and The Operating Room for the 21st

Century programs, and the risks of investing in a development-stage company, Still River Systems,

Inc., without a proven product. Further information on potential factors that could affect the

financial condition, results of operations and future plans of American Shared Hospital Services is

included in the Company s filings with the Securities and Exchange Commission, including the

Company s Annual Report on Form 10-K for the year ended December 31, 2005, and the definitive Proxy

Statement for the Annual Meeting of Shareholders to be held on June 28, 2006.

AMERICAN SHARED HOSPITAL SERVICES

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