Vickie Holcroft, project director for Oxford Churchill, added, "Varian was chosen to equip the new radiotherapy department because it is one of the technology leaders in this area and it has an excellent reputation for reliability." IGRT and IMRT IGRT, which is a major breakthrough in the ability to track organ motion and deliver treatments with higher precision, is only offered routinely at a handful of UK hospitals to date, including Clatterbridge Centre for Oncology and Ipswich Hospital. Varian's On-Board Imager device is a digital imaging accessory mounted on the medical linear accelerator, the machine which delivers the radiation treatments. It can be used to improve precision by verifying tumor locations and monitoring tumor motions at the moment of treatment. It will provide doctors with a clear indication of exactly how a tumor will move during treatment due to respiration or other repeatable physiological cycles.