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Varian Medical Systems Inc.

Varian Medical Systems, Inc., is the world's leading manufacturer of medical devices and software for treating cancer and other medical conditions with radiotherapy, radiosurgery, proton therapy, and brachytherapy.

The company supplies informatics software for managing comprehensive cancer clinics, radiotherapy centres and medical oncology practices. Varian is a premier supplier of tubes and digital detectors for X-ray imaging in medical, scientific, and industrial applications and also supplies X-ray imaging products for cargo screening and industrial inspection.

Varian Medical Systems, Inc. was founded (as Varian Associates) in the late 1940s by a group of scientists with strong connections to Stanford University. The company’s founders included brothers Russell and Sigurd Varian, inventors of the klystron tube, a high-frequency amplifier for generating microwaves that became an essential component of the modern medical linear accelerator.

During the 1950s and 1960s, Varian Associates invented or commercialized many technologies, including X-ray tubes and linear accelerators. In the late 1960s, the company developed the medical linear accelerator for radiation therapy. Ultimately, linear accelerators displaced cobalt as the radiation therapy method of choice.

In early 1999, Varian Associates changed its name to Varian Medical Systems after spinning off its semiconductor manufacturing equipment business and its scientific instruments business. Today Varian Medical Systems is the world’s leading manufacturer of integrated systems for treating cancer.

Their head office is in Palo Alto in California and have offices throughout the world, including UK, Europe and Asia.