6/25/2023 0 Comments Double exposure x raysThey have the benefit of using kilovoltage x-rays, which provide improved contrast over standard portal images. They are placed on the gantry at a 90 o offset to the primary beam. ![]() OBI devices are standard in modern linear accelerators. prostate cancer), the therapy staff can ensure that the target organ has not shifted significantly before delivering radiation.ĮPI still suffers from the megavoltage imaging limitations seen in normal portal imaging (poor contrast between tissues due to Compton Interactions). The advantage of EPI is that images can be acquired and viewed prior to treatment delivery. liquid ion chambers, silicon diodes or scintillation detectors)
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