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Volumetric Modulated Arc Therapy (VMAT) is one of the most common treatment techniques for esophageal cancer, which can give the radiation dose to conform to the tumor shape. However, the tumor dose and normal tissue dose depend on the photon energy. The purpose of the study is to compare the dosimetric data of PTV and OARs using 6 MV and 10 MV photon beams for VMAT plans for esophagus cancer. A retrospective data from the VMAT treatment plan of 17 esophageal cancer cases was replanned using 6 and 10 MV photon beams. The dosimetric parameter of PTV and OARs, skin dose, and monitor units were collected. The data was analyzed by using Wilcoxon rank sums test. The p-value <0.05, the difference was considered statistically significant. The result showed that the mean values of dosimetric data in PTV, OAR, Skin dose, and MU parameters were not significantly different. The percentage difference varied between 0.02-6.41. However, skin doses and MUs of 10 MV VMAT plans were less than 6 MV VMAT plans. In conclusion the tumor dose and normal tissue dose between using 6 MV and 10 MV photon beams were not different. Furthermore, skin doses and treatment time of 10 MV VMAT plans were reduced. Finally, the VMAT plan with a 10 MV photon beam can be selected to use for esophagus cancer.
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