Optimization of the Pixel Design for Large Gamma Cameras Based on Silicon Photomultipliers

Most single-photon emission computed tomography (SPECT) scanners employ a gamma camera with a large scintillator crystal and 50–100 large photomultiplier tubes (PMTs). In the past, we proposed that the weight, size and cost of a scanner could be reduced by replacing the PMTs with large-area silicon...

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Autores: Wunderlich, Carolin, Paoletti, Riccardo, Guberman, Daniel Alberto
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2024
País:España
Recursos:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/222180
Acesso em linha:https://hdl.handle.net/2445/222180
Access Level:acceso abierto
Palavra-chave:Tomografia computada per emissió de fotó simple
Silici
Single-photon emission computed tomography
Silicon
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spelling Optimization of the Pixel Design for Large Gamma Cameras Based on Silicon PhotomultipliersWunderlich, CarolinPaoletti, RiccardoGuberman, Daniel AlbertoTomografia computada per emissió de fotó simpleSiliciSingle-photon emission computed tomographySiliconMost single-photon emission computed tomography (SPECT) scanners employ a gamma camera with a large scintillator crystal and 50–100 large photomultiplier tubes (PMTs). In the past, we proposed that the weight, size and cost of a scanner could be reduced by replacing the PMTs with large-area silicon photomultiplier (SiPM) pixels in which commercial SiPMs are summed to reduce the number of readout channels. We studied the feasibility of that solution with a small homemade camera, but the question on how it could be implemented in a large camera remained open. In this work, we try to answer this question by performing Geant4 simulations of a full-body SPECT camera. We studied how the pixel size, shape and noise could affect its energy and spatial resolution. Our results suggest that it would be possible to obtain an intrinsic spatial resolution of a few mm FWHM and an energy resolution at 140 keV close to 10%, even if using pixels more than 20 times larger than standard commercial SiPMs of 6 × 6 mm2. We have also found that if SiPMs are distributed following a honeycomb structure, the spatial resolution is significantly better than if using square pixels distributed in a square grid.MDPI2024info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/222180Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.3390/s24186052Sensors, 2024https://doi.org/10.3390/s24186052cc-by (c) Wunderlich, C. et al., 2024http://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/2221802026-05-27T06:46:51Z
dc.title.none.fl_str_mv Optimization of the Pixel Design for Large Gamma Cameras Based on Silicon Photomultipliers
title Optimization of the Pixel Design for Large Gamma Cameras Based on Silicon Photomultipliers
spellingShingle Optimization of the Pixel Design for Large Gamma Cameras Based on Silicon Photomultipliers
Wunderlich, Carolin
Tomografia computada per emissió de fotó simple
Silici
Single-photon emission computed tomography
Silicon
title_short Optimization of the Pixel Design for Large Gamma Cameras Based on Silicon Photomultipliers
title_full Optimization of the Pixel Design for Large Gamma Cameras Based on Silicon Photomultipliers
title_fullStr Optimization of the Pixel Design for Large Gamma Cameras Based on Silicon Photomultipliers
title_full_unstemmed Optimization of the Pixel Design for Large Gamma Cameras Based on Silicon Photomultipliers
title_sort Optimization of the Pixel Design for Large Gamma Cameras Based on Silicon Photomultipliers
dc.creator.none.fl_str_mv Wunderlich, Carolin
Paoletti, Riccardo
Guberman, Daniel Alberto
author Wunderlich, Carolin
author_facet Wunderlich, Carolin
Paoletti, Riccardo
Guberman, Daniel Alberto
author_role author
author2 Paoletti, Riccardo
Guberman, Daniel Alberto
author2_role author
author
dc.subject.none.fl_str_mv Tomografia computada per emissió de fotó simple
Silici
Single-photon emission computed tomography
Silicon
topic Tomografia computada per emissió de fotó simple
Silici
Single-photon emission computed tomography
Silicon
description Most single-photon emission computed tomography (SPECT) scanners employ a gamma camera with a large scintillator crystal and 50–100 large photomultiplier tubes (PMTs). In the past, we proposed that the weight, size and cost of a scanner could be reduced by replacing the PMTs with large-area silicon photomultiplier (SiPM) pixels in which commercial SiPMs are summed to reduce the number of readout channels. We studied the feasibility of that solution with a small homemade camera, but the question on how it could be implemented in a large camera remained open. In this work, we try to answer this question by performing Geant4 simulations of a full-body SPECT camera. We studied how the pixel size, shape and noise could affect its energy and spatial resolution. Our results suggest that it would be possible to obtain an intrinsic spatial resolution of a few mm FWHM and an energy resolution at 140 keV close to 10%, even if using pixels more than 20 times larger than standard commercial SiPMs of 6 × 6 mm2. We have also found that if SiPMs are distributed following a honeycomb structure, the spatial resolution is significantly better than if using square pixels distributed in a square grid.
publishDate 2024
dc.date.none.fl_str_mv 2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/222180
url https://hdl.handle.net/2445/222180
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.3390/s24186052
Sensors, 2024
https://doi.org/10.3390/s24186052
dc.rights.none.fl_str_mv cc-by (c) Wunderlich, C. et al., 2024
http://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by (c) Wunderlich, C. et al., 2024
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv MDPI
publisher.none.fl_str_mv MDPI
dc.source.none.fl_str_mv Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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