Name: Ware arc 0.666
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The aim of this study is to compare the planning quality and delivery efficiency between dynamic intensity modulated radiation therapy d-IMRT and dual arc volumetric modulated arc therapy VMAT systematically for nasopharyngeal carcinoma NPC patients with multi-prescribed dose levels, and to analyze the correlations between target volumes and plan qualities. Compared to IMRT plans, VMAT plans showed the similar target dose and reduced the dose of the organs at risk, especially for small bowel and iliac wings.