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KMID : 1038720140250010023
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Progress in Medical Physics
2014 Volume.25 No. 1 p.23 ~ p.30
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Development of Dose Verification Method for In vivo Dosimetry in External Radiotherapy
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Hwang Ui-Jung
Baek Tae-Seong
Yoon Myong-Geun
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Abstract
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The purpose of this study is to evaluate the developed dose verification program for in vivo dosimetry based on transit dose in radiotherapy. Five intensity modulated radiotherapy (IMRT) plans of lung cancer patients were used in the irradiation of a homogeneous solid water phantom and anthropomorphic phantom. Transit dose distribution was measured using electronic portal imaging device (EPID) and used for the calculation of in vivo dose in patient. The average passing rate compared with treatment planning system based on a gamma index with a 3% dose and a 3 mm distance-to-dose agreement tolerance limit was 95% for the in vivo dose with the homogeneous phantom, but was reduced to 81.8% for the in vivo dose with the anthropomorphic phantom. This feasibility study suggested that transit dose-based in vivo dosimetry can provide information about the actual dose delivery to patients in the treatment room.
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KEYWORD
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Radiotherapy, Quality assurance, Electronic portal imaging device, Transit dose, In vivo dosimetry
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