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Evaluation of radiophotoluminescent glass dosimeter response for therapeutic spot scanning proton beam: suggestion of linear energy transfer‐based correction

A radiophotoluminescent glass dosimeter (RGD) is used for a postal audit of a photon beam because of its various excellent characteristics. However, it has not been used for scanning proton beams because its response characteristics have not been verified. In this study, the response of RGD to scann...

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Autores principales: Nagata, Junya, Yasui, Keisuke, Omachi, Chihiro, Toshiyuki, Toshito, Shimizu, Hidetoshi, Aoyama, Takahiro, Hayashi, Naoki
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/PMC8364267/
https://www.ncbi.nlm.nih.gov/pubmed/34339583
http://dx.doi.org/10.1002/acm2.13378
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author Nagata, Junya
Yasui, Keisuke
Omachi, Chihiro
Toshiyuki, Toshito
Shimizu, Hidetoshi
Aoyama, Takahiro
Hayashi, Naoki
author_facet Nagata, Junya
Yasui, Keisuke
Omachi, Chihiro
Toshiyuki, Toshito
Shimizu, Hidetoshi
Aoyama, Takahiro
Hayashi, Naoki
author_sort Nagata, Junya
collection PubMed
description A radiophotoluminescent glass dosimeter (RGD) is used for a postal audit of a photon beam because of its various excellent characteristics. However, it has not been used for scanning proton beams because its response characteristics have not been verified. In this study, the response of RGD to scanning protons was investigated to develop a dosimetry protocol using the linear energy transfer (LET)‐based correction factor. The responses of RGD to four maximum‐range‐energy‐pattern proton beams were verified by comparing it with ionization chamber (IC) dosimetry. The LET at each measurement depth was calculated via Monte Carlo (MC) simulation. The LET correction factor ([Formula: see text]) was the ratio between the uncorrected RGD dose ([Formula: see text]) and the IC dose at each measurement depth. [Formula: see text] can be represented as a function of LET using the following equation: [Formula: see text]. [Formula: see text] showed a linear under‐response with increasing LET, and the maximum dose difference between the IC dose and [Formula: see text] was 15.2% at an LET of 6.07 keV/μm. The LET‐based correction dose ([Formula: see text]) conformed within 3.6% of the IC dose. The mean dose difference (±SD) of [Formula: see text] and [Formula: see text] was –2.5 ± 6.9% and 0.0 ± 1.6%, respectively. To achieve accurate dose verification for scanning proton beams using RGD, we derived a linear regression equation based on LET. The results show that with appropriate LET correction, RGD can be used for dose verification of scanning proton beams.
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spelling pubmed-83642672021-08-23 Evaluation of radiophotoluminescent glass dosimeter response for therapeutic spot scanning proton beam: suggestion of linear energy transfer‐based correction Nagata, Junya Yasui, Keisuke Omachi, Chihiro Toshiyuki, Toshito Shimizu, Hidetoshi Aoyama, Takahiro Hayashi, Naoki J Appl Clin Med Phys Radiation Measurements A radiophotoluminescent glass dosimeter (RGD) is used for a postal audit of a photon beam because of its various excellent characteristics. However, it has not been used for scanning proton beams because its response characteristics have not been verified. In this study, the response of RGD to scanning protons was investigated to develop a dosimetry protocol using the linear energy transfer (LET)‐based correction factor. The responses of RGD to four maximum‐range‐energy‐pattern proton beams were verified by comparing it with ionization chamber (IC) dosimetry. The LET at each measurement depth was calculated via Monte Carlo (MC) simulation. The LET correction factor ([Formula: see text]) was the ratio between the uncorrected RGD dose ([Formula: see text]) and the IC dose at each measurement depth. [Formula: see text] can be represented as a function of LET using the following equation: [Formula: see text]. [Formula: see text] showed a linear under‐response with increasing LET, and the maximum dose difference between the IC dose and [Formula: see text] was 15.2% at an LET of 6.07 keV/μm. The LET‐based correction dose ([Formula: see text]) conformed within 3.6% of the IC dose. The mean dose difference (±SD) of [Formula: see text] and [Formula: see text] was –2.5 ± 6.9% and 0.0 ± 1.6%, respectively. To achieve accurate dose verification for scanning proton beams using RGD, we derived a linear regression equation based on LET. The results show that with appropriate LET correction, RGD can be used for dose verification of scanning proton beams. John Wiley and Sons Inc. 2021-08-02 /pmc/articles/PMC8364267/ /pubmed/34339583 http://dx.doi.org/10.1002/acm2.13378 Text en © 2021 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals LLC 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 Measurements
Nagata, Junya
Yasui, Keisuke
Omachi, Chihiro
Toshiyuki, Toshito
Shimizu, Hidetoshi
Aoyama, Takahiro
Hayashi, Naoki
Evaluation of radiophotoluminescent glass dosimeter response for therapeutic spot scanning proton beam: suggestion of linear energy transfer‐based correction
title Evaluation of radiophotoluminescent glass dosimeter response for therapeutic spot scanning proton beam: suggestion of linear energy transfer‐based correction
title_full Evaluation of radiophotoluminescent glass dosimeter response for therapeutic spot scanning proton beam: suggestion of linear energy transfer‐based correction
title_fullStr Evaluation of radiophotoluminescent glass dosimeter response for therapeutic spot scanning proton beam: suggestion of linear energy transfer‐based correction
title_full_unstemmed Evaluation of radiophotoluminescent glass dosimeter response for therapeutic spot scanning proton beam: suggestion of linear energy transfer‐based correction
title_short Evaluation of radiophotoluminescent glass dosimeter response for therapeutic spot scanning proton beam: suggestion of linear energy transfer‐based correction
title_sort evaluation of radiophotoluminescent glass dosimeter response for therapeutic spot scanning proton beam: suggestion of linear energy transfer‐based correction
topic Radiation Measurements
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8364267/
https://www.ncbi.nlm.nih.gov/pubmed/34339583
http://dx.doi.org/10.1002/acm2.13378
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