Intensity-modulated radiotherapy(IMRT) is gradually replacing conventional radiation therapy and has become the mainstream radical treatment for patients with nasopharyngeal carcinoma(NPC). IMRT can conform and increase radiation doses to tumor-associated regions as well as decrease exposure doses and volumes on normal organs and tissues to avoid damage on critical organs. Aside from system and setup errors, other factors, such as the gradual reduction of the primary NPC lesion and the decrease in volume of...
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