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A muti-center plan comparison for volumetric modulated arc therapy
LI Ming-hui*, HU Cai-rong, LI Guang-jun, YUN Wei-kang, ZHANG Dan-dan, CHEN Nian-yong, LI Jian-cheng, LI Xiang-lan, LIANG Jun, SUN Ying, BAI San, BAI Yan-ling, HUANG Xiao-yan, ZHANG Xiu-chun, DAI Jian-rong.*
Department of Radiation Oncology, Cancer Hospital (Institute), Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100021,China
Abstract Objective To evaluate the quality of volumetric modulated arc therapy (VMAT) plans among the sites and establish the common template for VMAT plan. Methods One test case was provided by each of five sites accordingly, and the CT with contours was send to the TPS after approved. All participants were asked to wake the VMAT plans for these test cases with uniform dose prescription and follow the planning strategy of their choice. Each test case includes five plans designed by the participants and one plan generated with the template. The quality score was used to evaluate the plan quality, and the MU with treatment time was used for execution efficiency. Results For NPC case, no plan was able to fulfill all dose objectives strictly;three plans failed some of the objectives but were still considered to be clinically acceptable;the other three plans were not able to reach the objectives. For Esophagus case, all six plans were considered to be clinically acceptable. For lung case, four plans were considered to be clinically acceptable;two plans were not able to reach the objectives. For Prostate case, four plans were able to fulfill all dose objectives strictly;one plan was still considered to be clinically acceptable;one plan was not able to reach the objectives. For Liver case, three plans were able to fulfill all dose objectives strictly;three plans were considered to be clinically acceptable. About the execution efficiency, treatment duration was 3—7 min, amount of MU was 350—900 MU, amount of control points was 80—160. Conclusions The presented planning studies showed that quality and execution efficiency for most plan have achieved the clinical requirements;the quality of VMAT plan′s template and benchmark database also meet the expectation.
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2013, Vol. 22 
