校正用水ファントムを用いたdirect tissue maximum ratio の測定によるリニアックの品質保証

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  • 原田 高行
    国立病院機構金沢医療センター中央放射線部 金沢大学大学院医薬保健学総合研究科保健学専攻
  • 武村 哲浩
    金沢大学医薬保健研究域保健学系

書誌事項

タイトル別名
  • Quality Assurance Procedure for Linear Accelerators Measuring Direct Tissue Maximum Ratio with a Calibration Water Phantom
  • 臨床技術 校正用水ファントムを用いたdirect tissue maximum ratioの測定によるリニアックの品質保証
  • リンショウ ギジュツ コウセイ ヨウスイ ファントム オ モチイタ direct tissue maximum ratio ノ ソクテイ ニ ヨル リニアック ノ ヒンシツ ホショウ

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<p>In this paper, we proposed an efficient quality assurance method which can measure direct tissue maximum ratio (TMRDir), total scatter factor (Scp, Dir), wedge factor (WFDir), tissue phantom ratio 20/10 (TPR20/10Dir) by using a calibration water phantom and a Farmer chamber. The TMRDir was compared with the calculated TMR (TMRCal) that was calculated from the percentage depth dose at the time of the linear accelerator installation. Scp, Dir, WFDir and TPR20/10Dir calculated from TMRDir were compared with Scp, BD, WFBD, and TPR20/10BD measured at the time of the linear accelerator installation. The difference between TMRDir and TMRCal was approximately within 1% except for using 60° wedge filter. The difference between Scp, Dir and Scp, BD was within 1%, between WFDir and WFBD was within 2%, between TPR20/10Dir and TPR20/10BD was within 1%, these differences were acceptable levels of AAPM TG-142 report. Also, coefficient of variation (CV) of TMRDir, ScpDir, WFDir and TPR20/10Dir when changing days and measuring multiple times were approximately within 1%, these CVs were reference levels of AAPM TG-106 report. We validated that was an efficient quality assurance method by measuring direct tissue maximum ratio, but the propose method has limited in measurable field size.</p>

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