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Alliance Healthcare Services, Inc. provides outsourced healthcare services to hospitals and healthcare providers in the United States. It operates through three segments: Radiology, Oncology, and Interventional. The company offers radiology services, such as magnetic resonance imaging (MRI), positron emission tomography (PET) and computed tomography (CT), nuclear medicine, ultrasound, X-Ray, mammography, and bone density screening services. It also provides oncology services, including conventional beam therapy, three-dimensional conformal radiation therapy, intensity modulated radiation therapy, image guided radiation therapy, stereotactic radiosurgery and stereotactic body radiotherapy, and low dose rate and high dose rate brachytherapy, as well as planning and preparation for treatment, simulation of treatment, delivery of radiation therapy, therapy management, and follow-up care services. In addition, the company offers minimally invasive interventional radiology and pain management services for a range of conditions and diseases, as well as laboratory testing and other services. As of December 31, 2015, it operated 625 diagnostic imaging and radiation therapy systems, including 113 fixed-site radiology centers, 33 radiation therapy centers and stereotactic radiosurgery facilities, 298 MRI systems, and 128 PET/CT systems. The company was founded in 1983 and is headquartered in Newport Beach, California.