American Shared Hospital Services leases radiosurgery and radiation therapy equipment to health care providers in the United States. The company offers radiosurgery equipment for the Gamma Knife stereotactic radiosurgery, a non-invasive procedure to treat malignant and benign brain tumors, and arteriovenous malformations, as well as for trigeminal neuralgia. It also provides image guided radiation therapy systems that integrate imaging and detection components into an accelerator, which allows clinicians to plan treatment, verify positioning, and deliver treatment. In addition, the company offers financing services for Leksell Gamma Knife units. Further, it provides proton beam therapy equipment and services in Orlando, Florida and Long Beach, California, as well as offers planning, installation, reimbursement, and marketing support services to its customers. As of March 1, 2018, it operated 16 Gamma Knife units, as well as served 17 medical centers in 15 states of the United States. American Shared Hospital Services was founded in 1980 and is based in San Francisco, California.