Varian Medical Systems, Inc. engages in the manufacture of medical devices and software for treating cancer and other medical condition. It operates through the following segments. Oncology Systems, Imaging Components, and Other. The Oncology Systems segment designs, manufactures, sells, and services hardware and software products for treating cancer with conventional radiotherapy, and advance treatments such as fixed field intensity-modulated radiation therapy, image-guided radiation therapy, stereotactic radiosurgery, stereotactic body radiotherapy, and brachytherapy. The Imaging Components segment comprises of radiographic or fluoroscopic imaging, mammography, special procedures, computed tomography, computer-aided diagnostics, and industrial applications. The Other segment includes Varian Particle Therapy, and Ginzton Technology Center. The company was founded by William Hansen, Edward Ginzton, Russell Varian, and Sigurd Varian in 1948 and is headquartered in Palo Alto, CA.