American Shared Hospital Services is a provider of financial and turnkey solutions to cancer treatment centers, hospitals, and large cancer networks worldwide. The Company's products include MR Guided Radiation Therapy Linacs, Advanced Linear Accelerators, Proton Beam Radiation Therapy Operations (PBRT), Brachytherapy systems, and through the Company's GK Financing partnership with Elekta, the Leksell Gamma Knife product and services. The Gamma Knife radiosurgery equipment is a non-invasive treatment for malignant and benign brain tumors, vascular malformations, and trigeminal neuralgia (facial pain). The PBRT is an alternative to traditional external beam, photon-based radiation delivered by linear accelerators. PBRT treats prostate, brain, spine, head and neck, lung, breast, gastrointestinal tract, and pediatric tumors. The Company typically provides the equipment, as well as planning, installation, reimbursement and marketing support services.