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Compact bunker shielding assessment for 1.5 T MR-Linac

This study evaluated the effect of the 1.5 T magnetic field of the magnetic resonance-guided linear accelerator (MR-Linac) on the radiation leakage doses penetrating the bunker radiation shielding wall. The evaluated 1.5 T MR-Linac Unity system has a bunker of the minimum recommended size. Unlike a...

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Autores principales: Sung, Jiwon, Choi, Yeonho, Kim, Jun Won, Lee, Ik Jae, Lee, Ho
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9038779/
https://www.ncbi.nlm.nih.gov/pubmed/35468983
http://dx.doi.org/10.1038/s41598-022-10498-0
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author Sung, Jiwon
Choi, Yeonho
Kim, Jun Won
Lee, Ik Jae
Lee, Ho
author_facet Sung, Jiwon
Choi, Yeonho
Kim, Jun Won
Lee, Ik Jae
Lee, Ho
author_sort Sung, Jiwon
collection PubMed
description This study evaluated the effect of the 1.5 T magnetic field of the magnetic resonance-guided linear accelerator (MR-Linac) on the radiation leakage doses penetrating the bunker radiation shielding wall. The evaluated 1.5 T MR-Linac Unity system has a bunker of the minimum recommended size. Unlike a conventional Linac, both primary beam transmission and secondary beam leakage were considered independently in the design and defined at the machine boundary away from the isocenter. Moreover, additional shielding was designed considering the numerous ducts between the treatment room and other rooms. The Linac shielding was evaluated by measuring the leakage doses at several locations. The intrinsic vibration and magnetic field were inspected at the proposed isocenter of the system. For verification, leakage doses were measured before and after applying the magnetic field. The intrinsic vibration and magnetic field readings were below the permitted limit. The leakage dose (0.05–12.2 µSv/week) also complied with internationally stipulated limits. The special shielding achieved a five-fold reduction in leakage dose. Applying the magnetic field increased the leakage dose by 0.12 to 4.56 µSv/week in several measurement points, although these values fall within experimental uncertainty. Thus, the effect of the magnetic field on the leakage dose could not be ascertained.
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spelling pubmed-90387792022-04-27 Compact bunker shielding assessment for 1.5 T MR-Linac Sung, Jiwon Choi, Yeonho Kim, Jun Won Lee, Ik Jae Lee, Ho Sci Rep Article This study evaluated the effect of the 1.5 T magnetic field of the magnetic resonance-guided linear accelerator (MR-Linac) on the radiation leakage doses penetrating the bunker radiation shielding wall. The evaluated 1.5 T MR-Linac Unity system has a bunker of the minimum recommended size. Unlike a conventional Linac, both primary beam transmission and secondary beam leakage were considered independently in the design and defined at the machine boundary away from the isocenter. Moreover, additional shielding was designed considering the numerous ducts between the treatment room and other rooms. The Linac shielding was evaluated by measuring the leakage doses at several locations. The intrinsic vibration and magnetic field were inspected at the proposed isocenter of the system. For verification, leakage doses were measured before and after applying the magnetic field. The intrinsic vibration and magnetic field readings were below the permitted limit. The leakage dose (0.05–12.2 µSv/week) also complied with internationally stipulated limits. The special shielding achieved a five-fold reduction in leakage dose. Applying the magnetic field increased the leakage dose by 0.12 to 4.56 µSv/week in several measurement points, although these values fall within experimental uncertainty. Thus, the effect of the magnetic field on the leakage dose could not be ascertained. Nature Publishing Group UK 2022-04-25 /pmc/articles/PMC9038779/ /pubmed/35468983 http://dx.doi.org/10.1038/s41598-022-10498-0 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Sung, Jiwon
Choi, Yeonho
Kim, Jun Won
Lee, Ik Jae
Lee, Ho
Compact bunker shielding assessment for 1.5 T MR-Linac
title Compact bunker shielding assessment for 1.5 T MR-Linac
title_full Compact bunker shielding assessment for 1.5 T MR-Linac
title_fullStr Compact bunker shielding assessment for 1.5 T MR-Linac
title_full_unstemmed Compact bunker shielding assessment for 1.5 T MR-Linac
title_short Compact bunker shielding assessment for 1.5 T MR-Linac
title_sort compact bunker shielding assessment for 1.5 t mr-linac
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9038779/
https://www.ncbi.nlm.nih.gov/pubmed/35468983
http://dx.doi.org/10.1038/s41598-022-10498-0
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