Dosimetry analysis of three kinds of radiation technique for postoperative gastric cancer

摘要

Objective:To compare dose-volume histograms (DVHs) and the dose distribution of three-dimensional conformal radiotherapy(3DCRT),7 fields radiotherapy(7FRT) and intensity-modulated radiotherapy (IMRT) of treatment planning in gastric cancer.Methods:We selected 5 patients with gastric cancer,they were pathologically confirmed stage T3,T4 or N+ gastric cancer.All patients underwent radical gastrectomy.A dosimetry study was carried out on these five patients.For each patient,three kinds of treatment planning were designed with a prescribed dose of 45Gy to 95％of PTV.Many kinds of parameters of these plans in each patient were compared:isodose distributions line,dose-volume histogram(DVH),V95％,V110％,CI,HI,EI of target volume and the dose of related critical organs.