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ID 116183
著者
Honda, Hirofumi Ehime University|Tokushima University
笈田, 将皇 Okayama University
Kanzaki, Hiromitsu National Hospital Organization Shikoku Cancer Center
Hamamoto, Yasushi National Hospital Organization Shikoku Cancer Center
Ishii, Yoshiaki Ehime University
Yamamoto, Ryuji Ehime University
Mochizuki, Teruhito Ehime University
Kido, Teruhito Ehime University
キーワード
prostate
transmission detector
volumetric‐modulated arc therapy
資料タイプ
学術雑誌論文
抄録
Volumetric‐modulated arc therapy (VMAT) requires highly accurate control of multileaf collimator (MLC) movement, rotation speed of linear accelerator gantry, and monitor units during irradiation. Pretreatment validation and monitoring of these factors during irradiation are necessary for appropriate VMAT treatment. Recently, a gantry mounted transmission detector “Delta4 Discover® (D4D)” was developed to detect errors in delivering doses and dose distribution immediately after treatment. In this study, the performance of D4D was evaluated. Simulation plans, in which the MLC position was displaced by 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0 mm from the clinically used original plans, were created for ten patients who received VMAT treatment for prostate cancer. Dose deviation (DD), distance‐to‐agreement (DTA), and gamma index analysis (GA) for each plan were evaluated by D4D. These results were compared to the results (DD, DTA and GA) measured by Delta4 Phantom + (D4P). We compared the deviations between the planned and measured values of the MLC stop positions A‐side and B‐side in five clinical cases of prostate VMAT during treatment and measured the GA values. For D4D, when the acceptable errors for DD, DTA, and GA were determined to be ≤3%, ≤2 mm, and ≤3%/2 mm, respectively, the minimum detectable errors in the MLC position were 2.0, 1.5, and 1.5 mm based on DD, DTA, and GA respectively. The corresponding minimum detectable MLC position errors were 2.0, 1.0, and 1.5 mm, respectively, for D4P. The deviation between the planned and measured position of MLC stopping point of prostate VMAT during treatment was stable at an average of −0.09 ± 0.05 mm, and all GA values were above 99.86%. In terms of delivering doses and dose distribution of VMAT, error detectability of D4D was comparable to that of D4P. The transmission‐type detector “D4D” is thus suitable for detecting delivery errors during irradiation.
掲載誌名
Journal of Applied Clinical Medical Physics
ISSN
15269914
cat書誌ID
AA12034060
出版者
Wiley Periodicals|American Association of Physicists in Medicine
22
7
開始ページ
66
終了ページ
76
発行日
2021-05-05
権利情報
This is an open access article under the terms of the Creative Commons Attribution License(https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium,provided the original work is properly cited.
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出版社版DOI
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フルテキストファイル
言語
eng
著者版フラグ
出版社版
部局
医学系
生物資源系