Varian Meical Systems (VMS) (NYSE: VAR) is engaged in the design and manufacture of advanced equipment and software solutions for treating cancer with radiation. Methods include: medical oncology, radiation oncology, radiosurgery, brachytherapy, and proton therapy. Varian also develops and manufactures x-ray tubes for original equipment manufacturers, replacement x-ray tubes, and flat-panel digital x-ray detectors for imaging in medical, scientific and industrial applications. The company has approximately 3900 employees and produces and markets products for treating cancer with radiation, including linear accelerators, treatment simulation and verification products, information management and treatment planning software. Varian produces a line of radiation therapy linear accelerators called the Clinac series; several variations of the Clinac treatment delivery system are installed in facilities all around the world.