Gamma Knife Perfexion System Supplied by American Shared Hospital Services Begins Treating Patients at Sacred Heart Health

  Gamma Knife Perfexion System Supplied by American Shared Hospital Services
  Begins Treating Patients at Sacred Heart Health System in Pensacola, Florida

Business Wire

SAN FRANCISCO -- March 28, 2013

AMERICAN SHARED HOSPITAL SERVICES (NYSE MKT:AMS), a leading provider of
turnkey technology solutions for advanced radiosurgical and radiation therapy
services, announced today that the Gamma Knife^® Perfexion^TM system it
supplied to Sacred Heart Health System in Pensacola, Florida has begun
treating patients.

Noting that Sacred Heart is a new hospital affiliation for American Shared,
AMS Chairman and Chief Executive Officer Ernest A. Bates, M.D., said, "This
latest addition to our Perfexion portfolio demonstrates that neurosurgeons and
radiation oncologists who know the competing technologies best continue to
demand this unequaled stereotactic radiosurgery system for treating cancers
and other diseases of the brain. We see additional opportunities to place
Gamma Knife Perfexions at new and existing AMS sites both in the U.S. and
internationally."

AMS, the largest owner of Gamma Knife Perfexion systems worldwide, has now
placed twelve Perfexion systems in the United States and one in Turkey; a
fourteenth system is scheduled to be installed at Northern Westchester
Hospital in Mt. Kisco, New York in the second quarter.

About Gamma Knife Perfexion

Gamma Knife Perfexion maintains full clinical compatibility with the classic
Gamma Knife and is supported by efficacy and outcome data from 600,000 treated
patients worldwide and thousands of peer-reviewed scientific articles, making
it a proven choice for radiosurgery of the brain. According to its
manufacturer, Elekta, Gamma Knife Perfexion reduces unwanted body dose to the
patient by up to 100 times compared with competing technologies, which is
particularly important for treatment of children and women of childbearing
age, and allows for a dramatically increased treatable volume, which is
expected to increase the number of patients that can benefit from Gamma Knife
surgery. Elekta estimates that the fully automated and efficient single
push-button approach can save 3-5 working weeks of physician time per year at
an average Gamma Knife center.

About AMS

American Shared Hospital Services provides turnkey technology solutions for
advanced radiosurgical and radiation therapy services. AMS is the world leader
in providing Gamma Knife radiosurgery equipment, a non-invasive treatment for
malignant and benign brain tumors, vascular malformations and trigeminal
neuralgia (facial pain). The Company also offers the latest IGRT and IMRT
systems, as well as its proprietary Operating Room for the 21st Century^SM
concept. AMS owns a preferred stock investment in Mevion Medical Systems,
Inc., developer of the compact MEVION S250 Proton Therapy System.

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 and
radiation therapy businesses, the risks of developing The Operating Room for
the 21st Century program, and the risks of investing in a development-stage
company, Mevion Medical 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 filings of the Company with the Securities and Exchange
Commission, including the Company's Annual Report on Form 10-K for the year
ended December 31, 2011, the Quarterly Report on form 10-Q for the quarter
ended March 31, 2012, the Quarterly Reports on Form 10-Q and 10-Q/A for the
quarter ended June 30, 2012, the Quarterly Report on form 10-Q for the quarter
ended September 30, 2012, and the definitive Proxy Statement for the Annual
Meeting of Shareholders held on June 7, 2012.

Contact:

American Shared Hospital Services
Ernest A. Bates, M.D., 415-788-5300
Chairman and Chief Executive Officer
e.bates@ashs.com
or
Berkman Associates
Neil Berkman, 310-477-3118
President
info@berkmanassociates.com