Dosimetry characteristics and gamma passing rate of ArcCHECK for the verification of fixed gantry intensity modulated radiation therapy treatment planning
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Abstract
Background: Pre-treatment dosimetric verification for patient specific quality assurance has become an essential part of intensity modulated radiation therapy (IMRT).
Objectives: To evaluate dosimetry characteristics and gamma passing rate of ArcCHECK for fixed gantry IMRT treatment planning.
Materials and methods: ArcCHECK dosimetry characteristics evaluation includes dose linearity, short term reproducibility, and field size dependence. In this study, 20 head and neck cancer treatment plans and gamma index with 3%/3 mm and 10% threshold criteria were evaluated.
Results: The study showed that diode detectors of ArcCHECK have an excellent dose linearly response with a linear regression coefficient of 1 (R2=1.0) and a short term reproducibility standard deviation ±0.04%. Field size dependent responses of diodes was identical to the response of ionization chamber. For KonRad treatment planning verification by ArcCHECK, average gamma passing rates for all 20 fixed gantry IMRT plans was 97.40% and calculated tolerance level was 94.77%.
Conclusion: ArcCHECK has good dosimetric characteristics and good efficiency for fixed gantry IMRT treatment planning verification.
Journal of Associated Medical Sciences 2017; 50(2): 300-306. Doi: 10.14456/jams.2017.30
Article Details
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Personal views expressed by the contributors in their articles are not necessarily those of the Journal of Associated Medical Sciences, Faculty of Associated Medical Sciences, Chiang Mai University.
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