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Usability of detecting delivery errors during treatment of prostate VMAT with a gantry‐mounted transmission detector

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...

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Autores principales: Honda, Hirofumi, Tominaga, Masahide, Sasaki, Motoharu, Oita, Masataka, Kanzaki, Hiromitsu, Hamamoto, Yasushi, Ishii, Yoshiaki, Yamamoto, Ryuji, Mochizuki, Teruhito, Kido, Teruhito, Uto, Yoshihiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8292707/
https://www.ncbi.nlm.nih.gov/pubmed/33955161
http://dx.doi.org/10.1002/acm2.13260
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author Honda, Hirofumi
Tominaga, Masahide
Sasaki, Motoharu
Oita, Masataka
Kanzaki, Hiromitsu
Hamamoto, Yasushi
Ishii, Yoshiaki
Yamamoto, Ryuji
Mochizuki, Teruhito
Kido, Teruhito
Uto, Yoshihiro
author_facet Honda, Hirofumi
Tominaga, Masahide
Sasaki, Motoharu
Oita, Masataka
Kanzaki, Hiromitsu
Hamamoto, Yasushi
Ishii, Yoshiaki
Yamamoto, Ryuji
Mochizuki, Teruhito
Kido, Teruhito
Uto, Yoshihiro
author_sort Honda, Hirofumi
collection PubMed
description 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 “Delta(4) 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 Delta(4) 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.
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spelling pubmed-82927072021-07-22 Usability of detecting delivery errors during treatment of prostate VMAT with a gantry‐mounted transmission detector Honda, Hirofumi Tominaga, Masahide Sasaki, Motoharu Oita, Masataka Kanzaki, Hiromitsu Hamamoto, Yasushi Ishii, Yoshiaki Yamamoto, Ryuji Mochizuki, Teruhito Kido, Teruhito Uto, Yoshihiro J Appl Clin Med Phys Radiation Oncology Physics 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 “Delta(4) 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 Delta(4) 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. John Wiley and Sons Inc. 2021-05-05 /pmc/articles/PMC8292707/ /pubmed/33955161 http://dx.doi.org/10.1002/acm2.13260 Text en © 2021 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, Inc. on behalf of American Association of Physicists in Medicine https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Radiation Oncology Physics
Honda, Hirofumi
Tominaga, Masahide
Sasaki, Motoharu
Oita, Masataka
Kanzaki, Hiromitsu
Hamamoto, Yasushi
Ishii, Yoshiaki
Yamamoto, Ryuji
Mochizuki, Teruhito
Kido, Teruhito
Uto, Yoshihiro
Usability of detecting delivery errors during treatment of prostate VMAT with a gantry‐mounted transmission detector
title Usability of detecting delivery errors during treatment of prostate VMAT with a gantry‐mounted transmission detector
title_full Usability of detecting delivery errors during treatment of prostate VMAT with a gantry‐mounted transmission detector
title_fullStr Usability of detecting delivery errors during treatment of prostate VMAT with a gantry‐mounted transmission detector
title_full_unstemmed Usability of detecting delivery errors during treatment of prostate VMAT with a gantry‐mounted transmission detector
title_short Usability of detecting delivery errors during treatment of prostate VMAT with a gantry‐mounted transmission detector
title_sort usability of detecting delivery errors during treatment of prostate vmat with a gantry‐mounted transmission detector
topic Radiation Oncology Physics
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8292707/
https://www.ncbi.nlm.nih.gov/pubmed/33955161
http://dx.doi.org/10.1002/acm2.13260
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