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Electron contamination suppression in transmission detectors for radiotherapy

Lana Beck Orcid Logo, Chiara De Sio, Richard Hugtenburg Orcid Logo, Jaap Velthuis

Physics in Medicine & Biology, Volume: 68, Issue: 21, Start page: 215014

Swansea University Authors: Richard Hugtenburg Orcid Logo, Jaap Velthuis

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DOI (Published version): 10.1088/1361-6560/acfec6

Abstract

Objective. Higher energy and intensity radiotherapy beams are being used, in part, due to the increased spatial accuracy of treatments. However, higher intensity beams can result in a larger total dose error, motivating the increasing need for real-time dose monitoring. We are developing a thin, rea...

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Published in: Physics in Medicine & Biology
ISSN: 0031-9155 1361-6560
Published: IOP Publishing 2023
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URI: https://cronfa.swan.ac.uk/Record/cronfa67934
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last_indexed 2024-11-25T14:21:07Z
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spelling 2024-11-07T11:52:53.7410112 v2 67934 2024-10-08 Electron contamination suppression in transmission detectors for radiotherapy efd2f52ea19cb047e01a01e6fa6fa54c 0000-0003-0352-9607 Richard Hugtenburg Richard Hugtenburg true false e781802af57442339d29ab1fa6156d25 Jaap Velthuis Jaap Velthuis true false 2024-10-08 MEDS Objective. Higher energy and intensity radiotherapy beams are being used, in part, due to the increased spatial accuracy of treatments. However, higher intensity beams can result in a larger total dose error, motivating the increasing need for real-time dose monitoring. We are developing a thin, real-time upstream monolithic active pixel sensor based system for beam monitoring with excellent precision on measuring the beam shape. Here we present a method to additionally provide dosimetry by adding thin conversion material in strips to the surface of the detector, a grating structure. Approach. By modulating the thickness of the conversion material to minimally disturb the contamination electron signal while enhancing the photon signal, the difference in these signals can be used to extract a photon-only signal, and hence dose. The simulation software Gate, based on Geant4, is utilised to study whether well functioning gratings can be better made from aluminium or copper and to optimise the thickness of a copper grating. Main results. It is possible to enhance the photon signal by a factor 6.7 (7.7) compared to the bare sensor for a 5.8 (6.7) MV beam, without modulation of the signal due to beam electrons. Significance. The grating can be used to perform dosimetry in real-time using a thin upstream detector. Journal Article Physics in Medicine &amp; Biology 68 21 215014 IOP Publishing 0031-9155 1361-6560 26 10 2023 2023-10-26 10.1088/1361-6560/acfec6 COLLEGE NANME Medical School COLLEGE CODE MEDS Swansea University Another institution paid the OA fee 2024-11-07T11:52:53.7410112 2024-10-08T10:55:53.4467983 Faculty of Medicine, Health and Life Sciences Swansea University Medical School - Medical Physics Lana Beck 0000-0003-4369-7648 1 Chiara De Sio 2 Richard Hugtenburg 0000-0003-0352-9607 3 Jaap Velthuis 4 67934__32873__55c57b5c83894cabb260973f35a7cec2.pdf 67934.VoR.pdf 2024-11-07T11:51:13.8738080 Output 1331233 application/pdf Version of Record true Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. true eng http://creativecommons.org/licenses/by/4.0
title Electron contamination suppression in transmission detectors for radiotherapy
spellingShingle Electron contamination suppression in transmission detectors for radiotherapy
Richard Hugtenburg
Jaap Velthuis
title_short Electron contamination suppression in transmission detectors for radiotherapy
title_full Electron contamination suppression in transmission detectors for radiotherapy
title_fullStr Electron contamination suppression in transmission detectors for radiotherapy
title_full_unstemmed Electron contamination suppression in transmission detectors for radiotherapy
title_sort Electron contamination suppression in transmission detectors for radiotherapy
author_id_str_mv efd2f52ea19cb047e01a01e6fa6fa54c
e781802af57442339d29ab1fa6156d25
author_id_fullname_str_mv efd2f52ea19cb047e01a01e6fa6fa54c_***_Richard Hugtenburg
e781802af57442339d29ab1fa6156d25_***_Jaap Velthuis
author Richard Hugtenburg
Jaap Velthuis
author2 Lana Beck
Chiara De Sio
Richard Hugtenburg
Jaap Velthuis
format Journal article
container_title Physics in Medicine &amp; Biology
container_volume 68
container_issue 21
container_start_page 215014
publishDate 2023
institution Swansea University
issn 0031-9155
1361-6560
doi_str_mv 10.1088/1361-6560/acfec6
publisher IOP Publishing
college_str Faculty of Medicine, Health and Life Sciences
hierarchytype
hierarchy_top_id facultyofmedicinehealthandlifesciences
hierarchy_top_title Faculty of Medicine, Health and Life Sciences
hierarchy_parent_id facultyofmedicinehealthandlifesciences
hierarchy_parent_title Faculty of Medicine, Health and Life Sciences
department_str Swansea University Medical School - Medical Physics{{{_:::_}}}Faculty of Medicine, Health and Life Sciences{{{_:::_}}}Swansea University Medical School - Medical Physics
document_store_str 0
active_str 0
description Objective. Higher energy and intensity radiotherapy beams are being used, in part, due to the increased spatial accuracy of treatments. However, higher intensity beams can result in a larger total dose error, motivating the increasing need for real-time dose monitoring. We are developing a thin, real-time upstream monolithic active pixel sensor based system for beam monitoring with excellent precision on measuring the beam shape. Here we present a method to additionally provide dosimetry by adding thin conversion material in strips to the surface of the detector, a grating structure. Approach. By modulating the thickness of the conversion material to minimally disturb the contamination electron signal while enhancing the photon signal, the difference in these signals can be used to extract a photon-only signal, and hence dose. The simulation software Gate, based on Geant4, is utilised to study whether well functioning gratings can be better made from aluminium or copper and to optimise the thickness of a copper grating. Main results. It is possible to enhance the photon signal by a factor 6.7 (7.7) compared to the bare sensor for a 5.8 (6.7) MV beam, without modulation of the signal due to beam electrons. Significance. The grating can be used to perform dosimetry in real-time using a thin upstream detector.
published_date 2023-10-26T08:35:13Z
_version_ 1821393828137926656
score 11.364387

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