Cargando…

Radiation protection in radiological imaging: a survey of imaging modalities used in Japanese institutions for verifying applicator placements in high-dose-rate brachytherapy

Institutional imaging protocols for the verification of brachytherapy applicator placements were investigated in a survey study of domestic radiotherapy institutions. The survey form designed by a free on-line survey system was distributed via the mailing-list system of the Japanese Society for Radi...

Descripción completa

Detalles Bibliográficos
Autores principales: Okamoto, Hiroyuki, Kito, Satoshi, Tohyama, Naoki, Yonai, Shunsuke, Kawamorita, Ryu, Nakamura, Masaru, Fujimoto, Takahiro, Tani, Syoji, Yomoda, Akihiro, Isobe, Toru, Furukawa, Hiroshi, Kotaka, Kikuo, Itami, Jun, Ikushima, Hitoshi, Dokiya, Takushi, Shioyama, Yoshiyuki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7779356/
https://www.ncbi.nlm.nih.gov/pubmed/33074329
http://dx.doi.org/10.1093/jrr/rraa088
_version_ 1783631317681831936
author Okamoto, Hiroyuki
Kito, Satoshi
Tohyama, Naoki
Yonai, Shunsuke
Kawamorita, Ryu
Nakamura, Masaru
Fujimoto, Takahiro
Tani, Syoji
Yomoda, Akihiro
Isobe, Toru
Furukawa, Hiroshi
Kotaka, Kikuo
Itami, Jun
Ikushima, Hitoshi
Dokiya, Takushi
Shioyama, Yoshiyuki
author_facet Okamoto, Hiroyuki
Kito, Satoshi
Tohyama, Naoki
Yonai, Shunsuke
Kawamorita, Ryu
Nakamura, Masaru
Fujimoto, Takahiro
Tani, Syoji
Yomoda, Akihiro
Isobe, Toru
Furukawa, Hiroshi
Kotaka, Kikuo
Itami, Jun
Ikushima, Hitoshi
Dokiya, Takushi
Shioyama, Yoshiyuki
author_sort Okamoto, Hiroyuki
collection PubMed
description Institutional imaging protocols for the verification of brachytherapy applicator placements were investigated in a survey study of domestic radiotherapy institutions. The survey form designed by a free on-line survey system was distributed via the mailing-list system of the Japanese Society for Radiation Oncology. Survey data of 75 institutions between August 2019 and October 2019 were collected. The imaging modalities used were dependent on resources available to the institutions. The displacement of a brachytherapy applicator results in significant dosimetric impact. It is essential to verify applicator placements using imaging modalities before treatment. Various imaging modalities used in institutions included a computed tomography (CT) scanner, an angiography X-ray system, a multi-purpose X-ray system and a radiotherapy simulator. The median total exposure time in overall treatment sessions was [Formula: see text] 75 s for gynecological and prostate cancers. Some institutions used fluoroscopy to monitor the brachytherapy source movement. Institutional countermeasures for reducing unwanted imaging dose included minimizing the image area, changing the imaging orientation, reducing the imaging frequency and optimizing the imaging conditions. It is worth noting that half of the institutions did not confirm imaging dose regularly. This study reported on the usage of imaging modalities for brachytherapy in Japan. More caution should be applied with interstitial brachytherapy with many catheters that can lead to potentially substantial increments in imaging doses for monitoring the actual brachytherapy source using fluoroscopy. It is necessary to share imaging techniques, standardize imaging protocols and quality assurance/quality control among institutions, and imaging dose guidelines for optimization of imaging doses delivered in radiotherapy should be developed.
format Online
Article
Text
id pubmed-7779356
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher Oxford University Press
record_format MEDLINE/PubMed
spelling pubmed-77793562021-01-07 Radiation protection in radiological imaging: a survey of imaging modalities used in Japanese institutions for verifying applicator placements in high-dose-rate brachytherapy Okamoto, Hiroyuki Kito, Satoshi Tohyama, Naoki Yonai, Shunsuke Kawamorita, Ryu Nakamura, Masaru Fujimoto, Takahiro Tani, Syoji Yomoda, Akihiro Isobe, Toru Furukawa, Hiroshi Kotaka, Kikuo Itami, Jun Ikushima, Hitoshi Dokiya, Takushi Shioyama, Yoshiyuki J Radiat Res Fundamental Radiation Science Institutional imaging protocols for the verification of brachytherapy applicator placements were investigated in a survey study of domestic radiotherapy institutions. The survey form designed by a free on-line survey system was distributed via the mailing-list system of the Japanese Society for Radiation Oncology. Survey data of 75 institutions between August 2019 and October 2019 were collected. The imaging modalities used were dependent on resources available to the institutions. The displacement of a brachytherapy applicator results in significant dosimetric impact. It is essential to verify applicator placements using imaging modalities before treatment. Various imaging modalities used in institutions included a computed tomography (CT) scanner, an angiography X-ray system, a multi-purpose X-ray system and a radiotherapy simulator. The median total exposure time in overall treatment sessions was [Formula: see text] 75 s for gynecological and prostate cancers. Some institutions used fluoroscopy to monitor the brachytherapy source movement. Institutional countermeasures for reducing unwanted imaging dose included minimizing the image area, changing the imaging orientation, reducing the imaging frequency and optimizing the imaging conditions. It is worth noting that half of the institutions did not confirm imaging dose regularly. This study reported on the usage of imaging modalities for brachytherapy in Japan. More caution should be applied with interstitial brachytherapy with many catheters that can lead to potentially substantial increments in imaging doses for monitoring the actual brachytherapy source using fluoroscopy. It is necessary to share imaging techniques, standardize imaging protocols and quality assurance/quality control among institutions, and imaging dose guidelines for optimization of imaging doses delivered in radiotherapy should be developed. Oxford University Press 2020-10-06 /pmc/articles/PMC7779356/ /pubmed/33074329 http://dx.doi.org/10.1093/jrr/rraa088 Text en © The Author(s) 2020. Published by Oxford University Press on behalf of The Japanese Radiation Research Society and Japanese Society for Radiation Oncology. http://creativecommons.org/licenses/by-nc/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com
spellingShingle Fundamental Radiation Science
Okamoto, Hiroyuki
Kito, Satoshi
Tohyama, Naoki
Yonai, Shunsuke
Kawamorita, Ryu
Nakamura, Masaru
Fujimoto, Takahiro
Tani, Syoji
Yomoda, Akihiro
Isobe, Toru
Furukawa, Hiroshi
Kotaka, Kikuo
Itami, Jun
Ikushima, Hitoshi
Dokiya, Takushi
Shioyama, Yoshiyuki
Radiation protection in radiological imaging: a survey of imaging modalities used in Japanese institutions for verifying applicator placements in high-dose-rate brachytherapy
title Radiation protection in radiological imaging: a survey of imaging modalities used in Japanese institutions for verifying applicator placements in high-dose-rate brachytherapy
title_full Radiation protection in radiological imaging: a survey of imaging modalities used in Japanese institutions for verifying applicator placements in high-dose-rate brachytherapy
title_fullStr Radiation protection in radiological imaging: a survey of imaging modalities used in Japanese institutions for verifying applicator placements in high-dose-rate brachytherapy
title_full_unstemmed Radiation protection in radiological imaging: a survey of imaging modalities used in Japanese institutions for verifying applicator placements in high-dose-rate brachytherapy
title_short Radiation protection in radiological imaging: a survey of imaging modalities used in Japanese institutions for verifying applicator placements in high-dose-rate brachytherapy
title_sort radiation protection in radiological imaging: a survey of imaging modalities used in japanese institutions for verifying applicator placements in high-dose-rate brachytherapy
topic Fundamental Radiation Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7779356/
https://www.ncbi.nlm.nih.gov/pubmed/33074329
http://dx.doi.org/10.1093/jrr/rraa088
work_keys_str_mv AT okamotohiroyuki radiationprotectioninradiologicalimagingasurveyofimagingmodalitiesusedinjapaneseinstitutionsforverifyingapplicatorplacementsinhighdoseratebrachytherapy
AT kitosatoshi radiationprotectioninradiologicalimagingasurveyofimagingmodalitiesusedinjapaneseinstitutionsforverifyingapplicatorplacementsinhighdoseratebrachytherapy
AT tohyamanaoki radiationprotectioninradiologicalimagingasurveyofimagingmodalitiesusedinjapaneseinstitutionsforverifyingapplicatorplacementsinhighdoseratebrachytherapy
AT yonaishunsuke radiationprotectioninradiologicalimagingasurveyofimagingmodalitiesusedinjapaneseinstitutionsforverifyingapplicatorplacementsinhighdoseratebrachytherapy
AT kawamoritaryu radiationprotectioninradiologicalimagingasurveyofimagingmodalitiesusedinjapaneseinstitutionsforverifyingapplicatorplacementsinhighdoseratebrachytherapy
AT nakamuramasaru radiationprotectioninradiologicalimagingasurveyofimagingmodalitiesusedinjapaneseinstitutionsforverifyingapplicatorplacementsinhighdoseratebrachytherapy
AT fujimototakahiro radiationprotectioninradiologicalimagingasurveyofimagingmodalitiesusedinjapaneseinstitutionsforverifyingapplicatorplacementsinhighdoseratebrachytherapy
AT tanisyoji radiationprotectioninradiologicalimagingasurveyofimagingmodalitiesusedinjapaneseinstitutionsforverifyingapplicatorplacementsinhighdoseratebrachytherapy
AT yomodaakihiro radiationprotectioninradiologicalimagingasurveyofimagingmodalitiesusedinjapaneseinstitutionsforverifyingapplicatorplacementsinhighdoseratebrachytherapy
AT isobetoru radiationprotectioninradiologicalimagingasurveyofimagingmodalitiesusedinjapaneseinstitutionsforverifyingapplicatorplacementsinhighdoseratebrachytherapy
AT furukawahiroshi radiationprotectioninradiologicalimagingasurveyofimagingmodalitiesusedinjapaneseinstitutionsforverifyingapplicatorplacementsinhighdoseratebrachytherapy
AT kotakakikuo radiationprotectioninradiologicalimagingasurveyofimagingmodalitiesusedinjapaneseinstitutionsforverifyingapplicatorplacementsinhighdoseratebrachytherapy
AT itamijun radiationprotectioninradiologicalimagingasurveyofimagingmodalitiesusedinjapaneseinstitutionsforverifyingapplicatorplacementsinhighdoseratebrachytherapy
AT ikushimahitoshi radiationprotectioninradiologicalimagingasurveyofimagingmodalitiesusedinjapaneseinstitutionsforverifyingapplicatorplacementsinhighdoseratebrachytherapy
AT dokiyatakushi radiationprotectioninradiologicalimagingasurveyofimagingmodalitiesusedinjapaneseinstitutionsforverifyingapplicatorplacementsinhighdoseratebrachytherapy
AT shioyamayoshiyuki radiationprotectioninradiologicalimagingasurveyofimagingmodalitiesusedinjapaneseinstitutionsforverifyingapplicatorplacementsinhighdoseratebrachytherapy