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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...
Autores principales: | , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2021
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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. |
format | Online Article Text |
id | pubmed-8292707 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
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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