American Radiosurgery produces the RGS Vertex360, which competes with the Gamma Knife® in the noninvasive treatment of brain tumors. The RGS Vertex360 utilizes concentric, controlled arcs formed by rotating gamma ray beams that are emitted from thirty cobalt-60 sources. The RGS Vertex360 utilizes the Explorer 4D treatment planning system with its award winning OsiriX medical image viewing system. The cost effective RGS technology has successfully treated over 6,000 patients to date. Gamma Knife is a trademark of the Elekta Corporation.