Dosimetry Characteristics and Gamma Passing Rate of ArcCHECK for Volumetric Modulated Arc Therapy Treatment Planning Verification

Authors

  • นันทวุฒิ สุดลอย ภาควิชารังสีวิทยา คณะแพทยศาสตร์ มหาวิทยาลัยเชียงใหม่
  • เอกสิทธิ์ ธราวิจิตรกุล ภาควิชารังสีวิทยา คณะแพทยศาสตร์ มหาวิทยาลัยเชียงใหม่
  • สมศักดิ์ วรรณวิไลรัตน์ ภาควิชารังสีวิทยา คณะแพทยศาสตร์ มหาวิทยาลัยเชียงใหม่

Keywords:

ArcCHECK, Diode detector, Gamma passing rate, Treatment planning verification, VMAT

Abstract

Background: Volumetric Modulated Arc Therapy (VMAT) is a complicated radiation technique in both the treatment planning and the machine delivery. A verification dosimeter with appropriate dosimetry characteristic is essential for treatment planning verification and quality assurance. Objectives: To study the dosimetry characteristics of ArcCHECK diode array detector and evaluate gamma passing rate of Volumetric Modulated Arc Therapy treatment planning in Nasopharyngeal cancer and Prostate cancer. Materials and Methods: Dosimetry characteristics of ArcCHECK include short-term reproducibility, dose linearity, field size dependence, dose rate dependence, directional dependence and out of field dependence were studied. Volumetric Modulated Arc Therapy technique using Synergy 6 MV photon beam were planned for each 10 cases of Nasopharyngeal and Prostate cancer. Then treatment planning verification were performed using the gamma passing rate of 3%/3mm and the 10% threshold level. Results: The result showed ArcCHECK has consistency response for short-term reproducibility with 0.05% standard deviation, good linearity response to radiation dose (R2=1.0) and increase response with increasing field size and dose rate. For directional dependence study, ArcCHECK was showed good consistency response with 1% dose difference for gantry angle between -55o to 55o. The scattered radiation measured out of radiation field has variation by field size and maximum dose was 6.9% with 15×15 cm2. This scattered dose decrease with distance from the edge of the radiation field. For Volumetric Modulated Arc Therapy treatment planning verification, it was found that the average gamma passing rate was 96.74%±2.04% and the action level was 92.74%. Conclusion: ArcCHECK diode array detector has good dosimetry characteristics and suitable for Volumetric Modulated Arc Therapy treatment planning verification. The action level of gamma passing for the department is 92.74%.

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Published

2019-06-27

How to Cite

1.
สุดลอย น, ธราวิจิตรกุล เ, วรรณวิไลรัตน์ ส. Dosimetry Characteristics and Gamma Passing Rate of ArcCHECK for Volumetric Modulated Arc Therapy Treatment Planning Verification. J Thai Assn of Radiat Oncol [Internet]. 2019 Jun. 27 [cited 2024 Jul. 3];25(1):43-57. Available from: https://he01.tci-thaijo.org/index.php/jtaro/article/view/203013

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