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Oncology Services International (OSI) is the leading independent provider of service for radiation therapy equipment, including linear accelerators and CT simulators. Founded in 1985, OSI's field engineers provide local responsive service and maintenance across the United States and Mexico. OSI’s cost-effective solutions, accompanied by its industry-leading high touch service, have positioned OSI as the leading alternative to the traditional reliance upon the manufacturer for extended service. Additionally, the company is the leading supplier of refurbished linear accelerators and parts. Its factory-tested Precision Certified radiation oncology medical devices have been sold and installed in more than 30 countries, and is supported by global distribution of linear accelerator parts.