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KMID : 0357520160390040577
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Journal of Radiological Science and Technology
2016 Volume.39 No. 4 p.577 ~ p.585
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Quality Assurance of Volumetric Modulated Arc Therapy Using the Dynalog Files
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Kang Dong-Jin
Jung Jae-Yong
Shin Young-Joo
Min Jung-Whan
Kim Yon-Lae
Yong Hyung-Jin
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Abstract
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The purpose of this study is to evaluate the accuracy of beam delivery QA software using the MLC dynalog file, about the VMAT plan with AAPM TG-119 protocol. The Clinac iX with a built-in 120 MLC was used to acquire the MLC dynalog file be imported in MobiusFx(MFX). To establish VMAT plan, Oncentra RTP system was used target and organ structures were contoured in Im’RT phantom. For evaluation of dose distribution was evaluated by using gamma index, and the point dose was evaluated by using the CC13 ion chamber in Im’RT phantom. For the evaluation of point dose, the mean of relative error between measured and calculated value was 1.41±0.92％(Target) and 0.89±0.86％(OAR), the confidence limit were 3.21(96.79％, Target) and 2.58(97.42％, OAR). For the evaluation of dose distribution, in case of Delta4PT, the average percentage of passing rate were 99.78±0.2％(3％/3 ㎜), 96.86±1.76％(2％/2 ㎜). In case of MFX, the average percentage of passing rate were 99.90±0.14％(3％/3 ㎜), 97.98±1.97％(2％/2 ㎜), the confidence limits(CL) were in case of Delta4PT
0.62(99.38％, 3％/3 ㎜), 6.6(93.4％, 2％/2 ㎜), in case of MFX, 0.38(99.62％, 3％/3 ㎜), 5.88(94.12％, 2％ /2 ㎜). In this study, we performed VMAT QA method using dynamic MLC log file compare to binary diode array chamber. All analyzed results were satisfied with acceptance criteria based on TG-119 protocol.
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KEYWORD
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VMAT , MobiusFx(MFX) , Dynalog file , Gamma index , Delta4PT
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