Varian Medical Systems makes systems for treating cancer using radiotherapy, proton therapy, stereotactic radiosurgery and brachytherapy. It was created in early 1999, when Varian Associates spun out its semiconductor manufacturing equipment business and its scientific instruments business. The company also makes software systems for radiation therapy treatment
planning and informatics software for managing comprehensive cancer clinics, radiotherapy centers and medical oncology practices. Varian also has an OEM business that supplies X-ray tubes and digital detectors to the medical, scientific, cargo screening and industrial markets.