A Pilot Research for Real-Time Specific Patient Quality Assurance Using the Hybrid Optimized Vmat Phantom (Hovp) in Volume Modulated Arc Therapy

Hyun Do Huh*; Sang Hyoun Choi*; Woo Chul Kim*; Hun Jeong Kim*; Kum Bae Kim; Seong Hoon Kim; Sam Ju Cho; Chul Kee Min; Kwang Hwan Cho; Sang Hoon Lee; Suk Lee; Jang Bo Shim; Dong Oh Shin**; Young Hoon Ji

Article

Original Article

Korean Journal of Medical Physics 2011; 22(4): 206-215

Published online December 25, 2011

A Pilot Research for Real-Time Specific Patient Quality Assurance Using the Hybrid Optimized Vmat Phantom (Hovp) in Volume Modulated Arc Therapy

체적변조회전치료에서 Hybrid Optimized VMAT Phantom (HOVP)을 이용한 실시간 환자 맞춤형 정도관리를 위한 예비연구

Hyun Do Huh*, Sang Hyoun Choi*^†, Woo Chul Kim*, Hun Jeong Kim*, Kum Bae Kim^††, Seong Hoon Kim^‡, Sam Ju Cho^§, Chul Kee Min^∥, Kwang Hwan Cho^∥, Sang Hoon Lee^¶, Suk Lee^#, Jang Bo Shim^#, Dong Oh Shin**, Young Hoon Ji^††

허현도*ㆍ최상현*^†ㆍ김우철*ㆍ김헌정*ㆍ김금배^††ㆍ김성훈^‡ㆍ조삼주^§민철기^∥ㆍ조광환^∥ㆍ이상훈^¶ㆍ이 석^#ㆍ심장보^#ㆍ신동오**ㆍ지영훈^††

Author Info ⁺

*Department of Radiation Oncology, College of Medicine, Inha University, Incheon, ^†Department of Nuclear Engineering, Hanyang University, ^‡Department of Radiation Oncology, College of Medicine, Hanyang University, Seoul, ^§Department of Radiation Oncology, College of Medicine, Eulji University, Seongnam, ^∥Department of Radiation Oncology, College of Medicine, Soonchunhyang University, Seoul, ^¶Department of Radiation Oncology, Cheil General Hospital, Kwandong University College of Medicine, Gangneung, Department of Radiation Oncology, ^#College of Medicine, Korea University, **School of Medicine, Kyung Hee University, ^††Research Center for Radiotherapy, Korea Institute of Radiological & Medical Sciences, Seoul, Korea

*인하대학교 의과대학 방사선종양학교실, ^†한양대학교 대학원 원자력공학과, ^‡한양대학교 의과대학 방사선종양학교실, ^§을지대학교 의과대학 방사선종양학교실, ^∥순천향대학교 의과대학 방사선종양학교실, ^¶관동대학교 의과대학 제일병원 방사선종양학교실, ^#고려대학교 의과대학 방사선종양학교실, **경희대학교 의과대학 방사선종양학교실, ^††한국원자력의학원 방사선치료연구센터

Abstract

Go to

Abstract

The purpose of this was to investigate the measurement of fluence dose map for the specific patient quality assurance. The measurement of fluence map was performed using 2D matrixx detector. The absorbed dose was measured by a glass detector, Gafchromic film and ion chamber in Hybrid Optimized VMAT Phantom (HOVP). For 2D Matrixx, the results of comparison were average passing rate 85.22%±1.7 (RT_Target), 89.96%±2.15 (LT_Target) and 95.14 %±1.18 (G4). The dose difference was 11.72%±0.531, -11.47%±0.991, 7.81%±0.857, -4.14%±0.761 at the G1, G2, G3, G4. In HOVP, the results of comparison for film were average passing rate (3%, 3 mm) 93.64 %±3.87, 90.82%±0.99. We were measured an absolute dose in steep gradient area G1, G2, G3, G4 using the glass detector. The difference between the measurement and calculation are 8.3% (G1), -5.4% (G2), 6.1% (G3), 7.2% (G4). The using an Ion-chamber were an average relative dose error -1.02%±0.222 (Rt_target), 0.96%±0.294 (Lt_target). Though we need a more study using a transmission detector. However, a measurement of real-time fluence map will be predicting a dose for real-time specific patient quality assurance in volume modulated arc therapy.

KeywordsVMAT, IMRT, HOVP, 2D array detector