Acceletronics' Theraview KV Imaging IGRT system for radiation oncology facilities can be mounted to any brand of linear accelerator, whether Varian, Elekta or Siemens, allowing a seamless upgrade to KV-imaging IGRT (image-guided radiation therapy). The Theraview KV IGRT system is offered in single-head and dual-head configurations, and supplements the Theraview MV IGRT system (marketed as an electronic portal imaging device, or EPID). The system allows for more-precise radiation therapy treatment delivery through the use of IGRT. Immediately prior to each session for the delivery of radiation, the system takes a real-time X-ray image of the patient and compares it to the previous reference.