Table of Contents
Journal of Radiotherapy
Volume 2014 (2014), Article ID 680205, 7 pages
http://dx.doi.org/10.1155/2014/680205
Clinical Study

Decreasing the Dose to the Rectal Wall by Using a Rectal Retractor during Radiotherapy of Prostate Cancer: A Comparative Treatment Planning Study

1Department of Radiology, Oncology and Radiation Sciences, Section of Oncology, Uppsala University, 751 85 Uppsala, Sweden
2Department of Radiology, Oncology and Radiation Science, Section of Medical Radiation Physics, Uppsala University, 751 85 Uppsala, Sweden
3MFT and Department of Oncology, Mälar Hospital, 631 88 Eskilstuna, Sweden
4Analyysitoimisto Statisti Oy, Rajakatu 31 a 12, 407 20 Jyväskylä, Finland

Received 22 January 2014; Revised 2 May 2014; Accepted 20 May 2014; Published 4 June 2014

Academic Editor: Carlos A. Perez

Copyright © 2014 Kristina Nilsson et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Aim. The aim of the study was to examine the dosimetric effect of rectal retraction, using a rectal retractor, by performing a comparative treatment planning study. Material and Methods. Treatment plans using volumetric arc therapy (VMAT) were produced for ten patients both with and without rectal retraction. A hypofractionation scheme of 42.7 Gy in seven fractions was used. The dose to the rectal wall was evaluated for both methods (with and without retraction) using four dose-volume criteria: , , , and . Results. The retraction of the rectal wall increased the distance between the rectal wall and the prostate. The rectal wall volume was reduced to zero for all dose-volume values except for , which was 0.2 cm3 in average when the rectal retractor was used. Conclusion. There was a significant decrease of , , , and when the rectal retractor was used without compromising the dose coverage of planning target volume (PTV).