Varian Medical Systems, Inc. designs, manufactures, sells, and services medical devices and software products for treating cancer and other medical conditions worldwide. Its Oncology Systems segment provides hardware and software products for treating cancer with radiotherapy, fixed field intensity-modulated radiation therapy, image-guided radiation therapy, volumetric modulated arc therapy, stereotactic radiosurgery, stereotactic body radiotherapy, and brachytherapy. Its products include linear accelerators, brachytherapy afterloaders, treatment simulation, verification equipment, and accessories; and information management, treatment planning, image processing, clinical knowledge exchange, patient care management, decision-making support, and practice management software. This segment serves university research and community hospitals, private and governmental institutions, healthcare agencies, physicians’ offices, oncology practices, radiotherapy centers, and cancer care clinics. The company’s Imaging Components segment provides X-ray imaging components for use in radiographic or fluoroscopic imaging, mammography, special procedures, computed tomography, computer aided diagnostics, and industrial applications. It sells its products to original equipment manufacturers, independent service companies, and end-users. This segment also offers Linatron X-ray accelerators, imaging processing software, and image detection products for security and inspection purposes. In addition, Varian Medical Systems, Inc. provides products and systems for delivering proton therapy; and develops various technologies in the areas of digital X-ray imaging, volumetric and functional imaging, and improved X-ray sources. The company was formerly known as Varian Associates, Inc. and changed its name to Varian Medical Systems, Inc. in April 1999. Varian Medical Systems, Inc. was founded in 1948 and is headquartered in Palo Alto, California.