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Oncology Services International (OSI) is the world leader in linear accelerator service as well as Precision Certified equipment and parts sales. Founded in 1985, OSI's team of more than 50 engineers provides ongoing service and maintenance on more than 200 linear accelerators and CTs. OSI's cost-effective solutions, accompanied by its industry-leading high touch service, has created the largest independent service organization in oncology, and positioned OSI as the leading alternative to the traditional reliance upon the manufacturer for extended service. The company provides radiation oncology services , linear accelerator maintenance and CT repair 24/7 on all major brands in the United States, has sold its factory-tested Precision Certified radiation oncology medical devices in 30 countries, and offers global distribution of new and fully tested used linac parts.