Abstract
IMRT is the standard treatment for NPC. Intravenous contrast during planning CT is usually injected for better delineation of structures, in particular carotid arteries and thyroids. However patients are actually treated without contrast. We do not know if dose to these structures change after contrast, especially when there is a concern of radiation-induced carotid stenosis and 2nd malignancy. We wish to investigate if there is a difference of dose to these structures after contrast.
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