Alliance HealthCare Services, Inc. (Alliance) is a provider of outsourced healthcare services to hospitals and providers. The Company operates through three segments: Radiology Division, Oncology Division and Interventional Healthcare Services Division. The radiology segment comprises diagnostic imaging services, including magnetic resonance imaging (MRI), positron emission tomography/computed tomography (PET/CT) and other imaging services. The radiology segment also comprises radiation oncology services. The interventional healthcare services segment provides interventional healthcare through therapeutic minimally invasive pain management procedures medical management, laboratory testing and other services. The Company operates freestanding outpatient radiology, oncology and interventional clinics, and Ambulatory Surgical Centers (ASC) that are not owned by hospitals or providers. It operates over 560 diagnostic imaging and radiation therapy systems.