RAS is Northern California's premier provider of specialty healthcare services. Our core services include diagnostic radiology, interventional/neurointerventional radiology, radiation oncology, PET / nuclear medicine, hematology / medical oncology, gynecologic oncology, urology, and thoracic / vascular surgery. Established in 1917, RAS provides quality healthcare to patients through multiple outpatient locations in four Sacramento area counties. RAS has over 900 employees, including physicians, health-care professionals and support staff.