Dosimetric Study of the Different Radiotherapy Ways for Postoperative Patients with Cervical Carcinoma

VernacularTitle:宫颈癌术后不同放疗技术剂量学比较研究
Author: Yuhai ZHANG ; Yuemin LI ; Huosheng XIA ; Shouyun HAN ; Ping LI ; Zhichen LIU
Publication Type:Journal Article
Keywords: cervical cancer; Intensity-modulated; 3D treatment planning
From: Chinese Journal of Medical Physics 2010;27(1):1583-1587
CountryChina
Language:Chinese
Abstract: Objective:To compare the dosimetric differences of the planning target volume(PTV)and the organs at risk(OAR)for postoperative patients with cervical cancer on intensity-modulated radiotherapy(IMRT)and conventional 4 fields(4F)or 2 fields(2F)radiotherapy.Methods:Six postoperative patients with cervical cancer were chosen randomly.The next steps were CT scan,PTV and OAR contouring.The treatment protocols were designed into conventional 4F,2F and IMRT by TPS.Finally,the doso distribution and DVH were compared.Results:About the conformability of PTV,IMRT showed a significantly superior dose distribution over conventional 4F(P=0.015),and conventional 4F was superior to 2F(P=0.043).IMRT as compared with conventional 4F or 2F protocols,the received dose of the 50%volume of bladder was reduced by 25.8%and 27.5%,the rectum was reduced by 12%and 14.3%,the small intestine was reduced by 36.5%and 50%.But the differences of the femoral head(left & right)and the ilium have no statistical significance.Conclusion:in postoperative radiotherapy for cervical cancer,IMRT have Inore dosimetric advantages than conventional radiotherapy.