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Lesson: Tumor Treatment Volumes Below are the definitions of the Volumes per the ICRU 50 & 62. OAR (Organ at Risk) – “[OARs] are normal tissues whose radiation sensitivity may significantly influence treatment planning and/or prescribed dose.” Examples of OARs for radiotherapy of an oral cavity tumor can include the spinal cord, brainstem, and parotid glands. PRV (Planning Risk Volume) – the OAR plus a margin, to compensate for movement and/or set-up errors of the OAR.
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