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Oncology Services International, founded in 1985, has become the leading independent alternative to manufacturers post-warranty maintenance and service for radiation therapy equipment, including all major brands of linacs and CT sims. With coast-to-coast coverage, and the only comprehensive linac training and testing facility outside of a major manufacturer, OSI has grown to serve more than 200 sites in the United States. In addition to service for linear accelerators and CT simulators, OSI provides Precision Certified refurbished and/or pre owned linear accelerator equipment globally. OSI is a leader in parts distribution for linear accelerators, providing cost effective sourcing options for all radiation therapy facilities worldwide.