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1-μm spatial resolution in silicon photon-counting CT detectors

Purpose: Spatial resolution for current scintillator-based computed tomography (CT) detectors is limited by the pixel size of about 1 mm. Direct conversion photon-counting detector prototypes with silicon- or cadmium-based detector materials have lately demonstrated spatial resolution equivalent to...

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Autores principales: Sundberg, Christel, Persson, Mats, Wikner, J. Jacob, Danielsson, Mats
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Society of Photo-Optical Instrumentation Engineers 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8598927/
https://www.ncbi.nlm.nih.gov/pubmed/34805448
http://dx.doi.org/10.1117/1.JMI.8.6.063501
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author Sundberg, Christel
Persson, Mats
Wikner, J. Jacob
Danielsson, Mats
author_facet Sundberg, Christel
Persson, Mats
Wikner, J. Jacob
Danielsson, Mats
author_sort Sundberg, Christel
collection PubMed
description Purpose: Spatial resolution for current scintillator-based computed tomography (CT) detectors is limited by the pixel size of about 1 mm. Direct conversion photon-counting detector prototypes with silicon- or cadmium-based detector materials have lately demonstrated spatial resolution equivalent to about 0.3 mm. We propose a development of the deep silicon photon-counting detector which will enable a resolution of [Formula: see text] , a substantial improvement compared to the state of the art. Approach: With the deep silicon sensor, it is possible to integrate CMOS electronics and reduce the pixel size at the same time as significant on-sensor data processing capability is introduced. A Gaussian curve can then be fitted to the charge cloud created in each interaction.We evaluate the feasibility of measuring the charge cloud shape of Compton interactions for deep silicon to increase the spatial resolution. By combining a Monte Carlo photon simulation with a charge transport model, we study the charge cloud distributions and induced currents as functions of the interaction position. For a simulated deep silicon detector with a pixel size of [Formula: see text] , we present a method for estimating the interaction position. Results: Using estimations for electronic noise and a lowest threshold of 0.88 keV, we obtain a spatial resolution equivalent to [Formula: see text] in the direction parallel to the silicon wafer and [Formula: see text] in the direction orthogonal to the wafer. Conclusions: We have presented a simulation study of a deep silicon detector with a pixel size of [Formula: see text] and a method to estimate the x-ray interaction position with ultra-high resolution. Higher spatial resolution can in general be important to detect smaller details in the image. The very high spatial resolution in one dimension could be a path to a practical implementation of phase contrast imaging in CT.
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spelling pubmed-85989272022-11-18 1-μm spatial resolution in silicon photon-counting CT detectors Sundberg, Christel Persson, Mats Wikner, J. Jacob Danielsson, Mats J Med Imaging (Bellingham) Physics of Medical Imaging Purpose: Spatial resolution for current scintillator-based computed tomography (CT) detectors is limited by the pixel size of about 1 mm. Direct conversion photon-counting detector prototypes with silicon- or cadmium-based detector materials have lately demonstrated spatial resolution equivalent to about 0.3 mm. We propose a development of the deep silicon photon-counting detector which will enable a resolution of [Formula: see text] , a substantial improvement compared to the state of the art. Approach: With the deep silicon sensor, it is possible to integrate CMOS electronics and reduce the pixel size at the same time as significant on-sensor data processing capability is introduced. A Gaussian curve can then be fitted to the charge cloud created in each interaction.We evaluate the feasibility of measuring the charge cloud shape of Compton interactions for deep silicon to increase the spatial resolution. By combining a Monte Carlo photon simulation with a charge transport model, we study the charge cloud distributions and induced currents as functions of the interaction position. For a simulated deep silicon detector with a pixel size of [Formula: see text] , we present a method for estimating the interaction position. Results: Using estimations for electronic noise and a lowest threshold of 0.88 keV, we obtain a spatial resolution equivalent to [Formula: see text] in the direction parallel to the silicon wafer and [Formula: see text] in the direction orthogonal to the wafer. Conclusions: We have presented a simulation study of a deep silicon detector with a pixel size of [Formula: see text] and a method to estimate the x-ray interaction position with ultra-high resolution. Higher spatial resolution can in general be important to detect smaller details in the image. The very high spatial resolution in one dimension could be a path to a practical implementation of phase contrast imaging in CT. Society of Photo-Optical Instrumentation Engineers 2021-11-18 2021-11 /pmc/articles/PMC8598927/ /pubmed/34805448 http://dx.doi.org/10.1117/1.JMI.8.6.063501 Text en © 2021 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
Persson, Mats
Wikner, J. Jacob
Danielsson, Mats
1-μm spatial resolution in silicon photon-counting CT detectors
title 1-μm spatial resolution in silicon photon-counting CT detectors
title_full 1-μm spatial resolution in silicon photon-counting CT detectors
title_fullStr 1-μm spatial resolution in silicon photon-counting CT detectors
title_full_unstemmed 1-μm spatial resolution in silicon photon-counting CT detectors
title_short 1-μm spatial resolution in silicon photon-counting CT detectors
title_sort 1-μm spatial resolution in silicon photon-counting ct detectors
topic Physics of Medical Imaging
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8598927/
https://www.ncbi.nlm.nih.gov/pubmed/34805448
http://dx.doi.org/10.1117/1.JMI.8.6.063501
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