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Compton coincidence in silicon photon-counting CT detectors
PURPOSE: Compton interactions amount to a significant fraction of the registered counts in a silicon detector. In a Compton interaction, only a part of the photon energy is deposited and a single incident photon can result in multiple counts unless tungsten shielding is used. Deep silicon has proved...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Society of Photo-Optical Instrumentation Engineers
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8823694/ https://www.ncbi.nlm.nih.gov/pubmed/35155716 http://dx.doi.org/10.1117/1.JMI.9.1.013501 |
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author | Sundberg, Christel Danielsson, Mats Persson, Mats |
author_facet | Sundberg, Christel Danielsson, Mats Persson, Mats |
author_sort | Sundberg, Christel |
collection | PubMed |
description | PURPOSE: Compton interactions amount to a significant fraction of the registered counts in a silicon detector. In a Compton interaction, only a part of the photon energy is deposited and a single incident photon can result in multiple counts unless tungsten shielding is used. Deep silicon has proved to be a competitive material for photon-counting CT detectors, but to improve the performance further, one possibility is to use coincidence techniques to identify Compton-scattered photons and reconstruct their incident energies. APPROACH: In a detector with no tungsten shielding, incident photons can interact through a series of interactions. Based on the position and energy of each interaction, probability-based methods can be used to estimate the incident photon energy. Here, we present a maximum likelihood estimation framework along with an alternative method to estimate the incident photon energy and position in a silicon detector. RESULTS: Assuming one incident photon per time frame, we show that the incident photon energy can be estimated with a mean error of [Formula: see text] and an RMS error of [Formula: see text] for a realistic case in which we assume a detector with limited energy and spatial resolution. The interaction position was estimated with a mean error of [Formula: see text] in [Formula: see text] direction and [Formula: see text] in [Formula: see text] direction. Corresponding RMS errors of [Formula: see text] and [Formula: see text] were achieved in [Formula: see text] and [Formula: see text] , respectively. CONCLUSIONS: The presented results show the potential of using probability-based methods to improve the performance of silicon detectors for CT. |
format | Online Article Text |
id | pubmed-8823694 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Society of Photo-Optical Instrumentation Engineers |
record_format | MEDLINE/PubMed |
spelling | pubmed-88236942023-02-08 Compton coincidence in silicon photon-counting CT detectors Sundberg, Christel Danielsson, Mats Persson, Mats J Med Imaging (Bellingham) Physics of Medical Imaging PURPOSE: Compton interactions amount to a significant fraction of the registered counts in a silicon detector. In a Compton interaction, only a part of the photon energy is deposited and a single incident photon can result in multiple counts unless tungsten shielding is used. Deep silicon has proved to be a competitive material for photon-counting CT detectors, but to improve the performance further, one possibility is to use coincidence techniques to identify Compton-scattered photons and reconstruct their incident energies. APPROACH: In a detector with no tungsten shielding, incident photons can interact through a series of interactions. Based on the position and energy of each interaction, probability-based methods can be used to estimate the incident photon energy. Here, we present a maximum likelihood estimation framework along with an alternative method to estimate the incident photon energy and position in a silicon detector. RESULTS: Assuming one incident photon per time frame, we show that the incident photon energy can be estimated with a mean error of [Formula: see text] and an RMS error of [Formula: see text] for a realistic case in which we assume a detector with limited energy and spatial resolution. The interaction position was estimated with a mean error of [Formula: see text] in [Formula: see text] direction and [Formula: see text] in [Formula: see text] direction. Corresponding RMS errors of [Formula: see text] and [Formula: see text] were achieved in [Formula: see text] and [Formula: see text] , respectively. CONCLUSIONS: The presented results show the potential of using probability-based methods to improve the performance of silicon detectors for CT. Society of Photo-Optical Instrumentation Engineers 2022-02-08 2022-01 /pmc/articles/PMC8823694/ /pubmed/35155716 http://dx.doi.org/10.1117/1.JMI.9.1.013501 Text en © 2022 The Authors https://creativecommons.org/licenses/by/4.0/Published by SPIE under a Creative Commons Attribution 4.0 International License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI. |
spellingShingle | Physics of Medical Imaging Sundberg, Christel Danielsson, Mats Persson, Mats Compton coincidence in silicon photon-counting CT detectors |
title | Compton coincidence in silicon photon-counting CT detectors |
title_full | Compton coincidence in silicon photon-counting CT detectors |
title_fullStr | Compton coincidence in silicon photon-counting CT detectors |
title_full_unstemmed | Compton coincidence in silicon photon-counting CT detectors |
title_short | Compton coincidence in silicon photon-counting CT detectors |
title_sort | compton coincidence in silicon photon-counting ct detectors |
topic | Physics of Medical Imaging |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8823694/ https://www.ncbi.nlm.nih.gov/pubmed/35155716 http://dx.doi.org/10.1117/1.JMI.9.1.013501 |
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