Feasibility of the partial-single arc technique in RapidArc planning for prostate cancer treatment

作     者：Suresh Rana ChihYao Cheng 

作者机构：Department of Medical PhysicsProCure Proton Therapy Center5901 West Memorial RoadOklahoma CityOK 73142USA Department of Radiation OncologyVantage OncologySan Fernando Valley RegionWest HillsCA 91307USA 

出 版 物：《Chinese Journal of Cancer》 (Chinese Journal of Cancer)

年 卷 期：2013年第32卷第10期

页      面：546-552页

核心收录：

学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学] 

主　　题：治疗计划系统 SA技术 前列腺癌 Eclipse 辐射剂量 参数规划 优化参数 剂量分布 

摘      要：The volumetric modulated arc therapy(VMAT)technique,in the form of RapidArc,is widely used to treat prostate *** full-single arc(f-SA)technique in RapidArc planning for prostate cancer treatment provides efficient treatment,but it also delivers a higher radiation dose to the *** study aimed to compare the dosimetric results from the new partial-single arc(p-SA)technique with those from the f-SA technique in RapidArc planning for prostate cancer *** this study,10 patients with lowrisk prostate cancer were *** each patient,two sets of RapidArc plans(f-SA and p-SA)were created in the Eclipse treatment planning *** f-SA plan was created using one full arc,and the p-SA plan was created using planning parameters identical to those of the f-SA plan but with anterior and posterior avoidance *** dosimetric parameters of the f-SA and p-SA plans were evaluated and compared for the same target coverage and identical plan optimization *** f-SA and p-SA plans showed an average difference of±1%for the doses to the planning target volume(PTV),and there were no clear differences in dose homogeneity or plan *** comparison to the f-SA technique,the p-SA technique reduced the doses to the rectum by approximately 6.1%to 21.2%,to the bladder by approximately 10.3%to 29.5%,and to the penile bulb by approximately 2.2%.In contrast,the dose to the femoral heads,the integral dose,and the number of monitor units were higher in the p-SA plans by approximately 34.4%,7.7%,and 9.2%,*** conclusion,it is feasible to use the p-SA technique for RapidArc planning for prostate cancer *** the same PTV coverage and identical plan optimization parameters,the p-SA technique is better in sparing the rectum and bladder without compromising plan conformity or target homogeneity when compared to the f-SA technique.