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On Board Imager The On-Board (OBI-kV) Imaging System is technology used through the Linear Accelerator system for tracking target movement and/or setup variations before each treatment. If the Radiation Oncologist wants images taken daily or weekly, this technology is designed to meet that patient’s treatment needs. It only takes a matter of minutes, because image acquisition can be achieved remotely while the radiation therapists are outside the room. Mechanical arms attached on both sides of the linear accelerator take images of the body from several different angles depending on the mode. One arm contains the x-ray tube, and the other arm holds the detector. After both arms are fully extended, the imaging of choice can begin. Minute adjustments can be made to ensure the prescribed dose of radiation is delivered to the target location. The OBI system also allows for several images to be acquired as the arms rotate 360° around the patient. The images are reconstructed to show a three-dimensional view of the internal anatomy. Because certain tissues in the body are more radiosensitive than others, this type of imaging is pertinent to ensure those areas don't receive any or very little radiation. Without a doubt, this technology allows us to give our patients the best treatment possible -- every single time.