Objective To analyze the dosimetry characteristics of thymoma radiotherapy with intensity modulated radiation therapy(IMRT) and volumetric modulated arc therapy(VMAT) technology, and provide further guidance for designing thymoma radiation therapy plan. Methods From September 2012 to February 2013, a total of 10 patients with thymoma were enrolled, which included 7 males and 3 females with ages of 38- 63 years old. The gross tumor volume(GTV), clinical target volume(CTV) and planning target volume(PTV) of t...