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Original Article

Korean Journal of Medical Physics 2011; 22(2): 99-105

Published online June 25, 2011

Copyright © Korean Society of Medical Physics.

Intensity Modulated Radiation Therapy Commissioning and Quality Assurance: Implementation of AAPM TG119

세기조절방사선치료(IMRT)의 Commissioning 및 정도관리: AAPM TG119 적용

Woo Sang Ahn, Byung Chul Cho

안우상ㆍ조병철

Department of Radiation Oncology, ASAN Medical Center, University of Ulsan College of Medicine, Seoul, Korea

울산대학교 의과대학 서울아산병원 방사선종양학교실

Abstract

The purpose of this study is to evaluate the accuracy of IMRT in our clinic from based on TG119 procedure and establish action level. Five IMRT test cases were described in TG119: multi-target, head&neck, prostate, and two C-shapes (easy&hard). There were used and delivered to water-equivalent solid phantom for IMRT. Absolute dose for points in target and OAR was measured by using an ion chamber (CC13, IBA). EBT2 film was utilized to compare the measured two-dimensional dose distribution with the calculated one by treatment planning system. All collected data were analyzed using the TG119 specifications to determine the confidence limit. The mean of relative error (%) between measured and calculated value was 1.2±1.1% and 1.2±0.7% for target and OAR, respectively. The resulting confidence limits were 3.4% and 2.6%. In EBT2 film dosimetry, the average percentage of points passing the gamma criteria (3%/3 mm) was 97.7±0.8%. Confidence limit values determined by EBT2 film analysis was 3.9%. This study has focused on IMRT commissioning and quality assurance based on TG119 guideline. It is concluded that action level were ±4% and ±3% for target and OAR and 97% for film measurement, respectively. It is expected that TG119-based procedure can be used as reference to evaluate the accuracy of IMRT for each institution.

KeywordsIntensity modulated radiation therapy (IMRT), Commissioning, Quality assurance

Korean Society of Medical Physics

Vol.35 No.2
June 2024

pISSN 2508-4445
eISSN 2508-4453
Formerly ISSN 1226-5829

Frequency: Quarterly

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