For more information
Ernest A. Bates, M.D., Chairman and CEO
email: eabates@ashs.com

American Shared Hospital Services
Two Embarcadero Center, Suite 410
San Francisco, CA 94111

Gamma Knife Perfexion System Supplied by American Shared Hospital Services Begins Treating Patients at Lovelace Medical Center

San Francisco, CA, June 7, 2011 -- AMERICAN SHARED HOSPITAL SERVICES (NYSE AMEX:AMS), a leading provider of turnkey technology solutions for advanced radiosurgical and radiation therapy services, announced today that the Gamma Knife® Perfexion™ system it supplied to Lovelace Medical Center in Albuquerque, New Mexico, has begun treating patients. As announced in April, this Perfexion system is an upgrade to the Gamma Knife supplied by AMS to Lovelace Medical Center in 2003.

“Widely regarded as the most advanced stereotactic radiosurgery system available today, the Perfexion system refines and expands the therapeutic potential for radiosurgery procedures in the brain, cervical spine and head and neck regions,” said David Nevill, chief executive officer of Lovelace Medical Center. “We are proud that this state-of-the-art technology is now available to better serve our cancer patients."

Lovelace Medical Center is the flagship hospital of Lovelace Health System, which is comprised of a network of three acute-care hospitals that include Lovelace Medical Center, Lovelace Women's Hospital and Lovelace Westside Hospital, a rehabilitation hospital, Lovelace Health Plan offering access to a wide range of health care providers and specialists across New Mexico, S.E.D. Medical Laboratories, and 11 retail pharmacy locations in Albuquerque, Rio Rancho and Santa Fe.

AMS Chairman and Chief Executive Officer Ernest A. Bates, M.D., said, "We are pleased to provide Lovelace with this upgrade to next-generation radiosurgery technology at an affordable price."

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 500,000 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 (www.ashs.com) provides turnkey technology solutions for advanced radiosurgical and radiation therapy services. Since 1991, AMS' creative financing solutions have enabled its clinical partners to make the latest advances in radiation oncology available to patients at an affordable price. 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® concept. AMS also is a leader in proton beam radiation therapy (PBRT), the next great growth opportunity in radiation oncology. AMS currently is developing PBRT centers in Dayton, Ohio (Kettering Medical Center), Boston (Tufts Medical Center), Orlando (Orlando Regional Healthcare) and Long Beach, California (Long Beach Memorial Medical Center), and is negotiating additional projects. AMS also owns a preferred stock investment in Still River Systems, developer of the compact Monarch 250 PBRT system, which has not yet been approved by the FDA.

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, 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 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, 2010, the Quarterly Report on Form 10-Q for the quarter ended March 31, 2011, and the definitive Proxy Statement for the Annual Meeting of Shareholders to be held on June 9, 2011.

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