SU-E-T-604: Inter Planner Dosimetric Variations in IMRT

Medical Physics
S SrivastavaI Das

Abstract

To study inter-planner variations in IMRT dosimetry with identical dose prescription in IMRT optimization for estimation of quality of treatment plans by using dose volume histogram (DVH). Five treatment planners: p1, p2, p3, p4 and p5 with Eclipse TPS and Varian accelerator were chosen. The 3D data sets including PTV and OAR of a prostate case was sent with instructions for beam orientations, energy and dose-volume constraints. Each planner performed the treatment planning process with inhomogeneity corrections by using the same dose constraints. DVH and isodose distributions were compared to examine the inter-planner variations. There were large variations in the IMRT plans reflected by the DVH among the planners even with identical dose constraints in IMRT optimization. Clinically constraint#1 (D95-V95) dose criteria could be considered as the most important one. Two planners did not meet the criteria, whereas planner 4 met all of the dose criteria for PTV and OARs. The inter-planner variations in PTV as large as 20% were found in this study. Every time optimization is performed even with the same constraints, the DVH output was significantly different due to the differences in constraint weights. There exists a significant ...Continue Reading

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