کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5529835 | 1401708 | 2017 | 5 صفحه PDF | دانلود رایگان |
PurposeTo evaluate the impact of endorectal balloon (ERB) on anorectal dose during postoperative VMAT of prostate cancer.MethodsIn ten patients referred for salvage radiotherapy CTs were obtained without ERB and with air-filled ERB of 50Â ml and 100Â ml. CTs were repeated weekly (4-6 control CTs) and registered to the respective planning CT. For each planning CT, a VMAT plan was made with defined anorectal dose constraints and propagated on the respective control CTs. The dose volumes V40Â Gy, V60Â Gy and V65Â Gy of the rectal and anal wall (Rwall and Awall, respectively) and the ERB position were obtained from each plan.ResultsIn plans with ERB, the mean Rwall dose volumes V40Â Gy, V60Â Gy and V65Â Gy were higher by 8%, 5% and 2% (ERB 50Â ml) and 2%, 3% and 3% (ERB 100Â ml) in comparison to plans without ERB. The respective Awall dose volume differences were 2%, 0%, â1% (ERB 50Â ml), and â3%, â2%, â2% (ERB 100Â ml). The dose volume variability of the Rwall was comparable with and without ERB, but was slightly reduced by ERB for the Awall. The mean ERB position variability was >2Â mm in anterior-posterior and inferior-superior directions.ConclusionThe use of ERB during post-operative VMAT has no advantages for anorectal dose.
Journal: Radiotherapy and Oncology - Volume 123, Issue 3, June 2017, Pages 454-458