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Title: Sci—Sat AM: Stereo — 02: Implementation of a VMAT class solution for kidney SBRT

An emerging treatment option for inoperable primary renal cell carcinoma and oligometastatic adrenal lesions is stereotactic body radiation therapy (SBRT). At our center, kidney SBRT treatments were originally planned with IMRT. The goal was to plan future patients using VMAT to improve treatment delivery efficiency. The purpose of this work was twofold: 1) to develop a VMAT class solution for the treatment of kidney SBRT; and, 2) to assess VMAT plan quality when compared to IMRT plans. Five patients treated with IMRT for kidney SBRT were reviewed and replanned in Pinnacle using a single VMAT arc with a 15° collimator rotation, constrained leaf motion and 4° gantry spacing. In comparison, IMRT plans utilized 7–9 6MV beams, with various collimator rotations and up to 2 non-coplanar beams for maximum organ-at-risk (OAR) sparing. Comparisons were made concerning target volume conformity, homogeneity, dose to OARs, treatment time and monitor units (MUs). There was no difference in MUs; however, VMAT reduced the treatment time from 13.0±2.6min, for IMRT, to 4.0±0.9min. The collection of target and OAR constraints and SmartArc parameters, produced a class solution that generated VMAT plans with increased target homogeneity and improved 95% conformity index calculated at < 1.2. In general, themore » VMAT plans displayed a reduced maximum point dose to nearby OARs with increased intermediate dose to distant OARs. Overall, the introduction of a VMAT class solution for kidney SBRT improves efficiency by reducing treatment planning and delivery time.« less
Authors:
; ;  [1] ;  [1] ;  [2]
  1. Odette Cancer Centre, Sunnybrook Health Sciences Centre, Toronto, ON (Canada)
  2. (Canada)
Publication Date:
OSTI Identifier:
22409498
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Physics; Journal Volume: 41; Journal Issue: 8; Other Information: (c) 2014 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES; CARCINOMAS; COLLIMATORS; COMPARATIVE EVALUATIONS; KIDNEYS; PATIENTS; PLANNING; RADIATION DOSES; RADIOTHERAPY; ROTATION