Varian Medical Systems (VAR) of Palo Alto, California, USA, is the world leader in radiation oncology treatments and software. These medical devices include linear accelerators and software for treating cancer and other medical conditions with radiotherapy, radiosurgery, proton therapy, and brachytherapy. The company supplies software for managing comprehensive cancer clinics, radiotherapy centers, and medical oncology practices. Varian is a supplier of tubes and digital detectors for X-ray imaging in medical diagnostics, dentistry, veterinary care, scientific, security, industrial inspection including high-energy X-ray technology for cargo screening. Varian Medical Systems employs approximately 6,350 people at manufacturing sites in North America, Europe, and China and approximately 70 sales and support offices around the world.