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Photon boost plan and carbon ion boost plan for a patient with T4 staged nasopharynx carcinoma for comparison, especially regarding structures at risk. With carbon ions, more conformal doses can be delivered to the target organ and adjacent organs can be spared more adequately. While the brainstem receives at least 10% of the delivered dose in the photon boost plan, the brainstem can be spared nearly completely with carbon ion.
