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Terahertz Constant Velocity Flying Spot for 3D Tomographic Imaging

This work reports on a terahertz tomography technique using constant velocity flying spot scanning as illumination. This technique is essentially based on the combination of a hyperspectral thermoconverter and an infrared camera used as a sensor, a source of terahertz radiation held on a translation...

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Detalles Bibliográficos
Autores principales: Aouali, Abderezak, Chevalier, Stéphane, Sommier, Alain, Pradere, Christophe
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10299114/
https://www.ncbi.nlm.nih.gov/pubmed/37367460
http://dx.doi.org/10.3390/jimaging9060112
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author Aouali, Abderezak
Chevalier, Stéphane
Sommier, Alain
Pradere, Christophe
author_facet Aouali, Abderezak
Chevalier, Stéphane
Sommier, Alain
Pradere, Christophe
author_sort Aouali, Abderezak
collection PubMed
description This work reports on a terahertz tomography technique using constant velocity flying spot scanning as illumination. This technique is essentially based on the combination of a hyperspectral thermoconverter and an infrared camera used as a sensor, a source of terahertz radiation held on a translation scanner, and a vial of hydroalcoholic gel used as a sample and mounted on a rotating stage for the measurement of its absorbance at several angular positions. From the projections made in 2.5 h and expressed in terms of sinograms, the 3D volume of the absorption coefficient of the vial is reconstructed by a back-projection method based on the inverse Radon transform. This result confirms that this technique is usable on samples of complex and nonaxisymmetric shapes; moreover, it allows 3D qualitative chemical information with a possible phase separation in the terahertz spectral range to be obtained in heterogeneous and complex semitransparent media.
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spelling pubmed-102991142023-06-28 Terahertz Constant Velocity Flying Spot for 3D Tomographic Imaging Aouali, Abderezak Chevalier, Stéphane Sommier, Alain Pradere, Christophe J Imaging Article This work reports on a terahertz tomography technique using constant velocity flying spot scanning as illumination. This technique is essentially based on the combination of a hyperspectral thermoconverter and an infrared camera used as a sensor, a source of terahertz radiation held on a translation scanner, and a vial of hydroalcoholic gel used as a sample and mounted on a rotating stage for the measurement of its absorbance at several angular positions. From the projections made in 2.5 h and expressed in terms of sinograms, the 3D volume of the absorption coefficient of the vial is reconstructed by a back-projection method based on the inverse Radon transform. This result confirms that this technique is usable on samples of complex and nonaxisymmetric shapes; moreover, it allows 3D qualitative chemical information with a possible phase separation in the terahertz spectral range to be obtained in heterogeneous and complex semitransparent media. MDPI 2023-05-31 /pmc/articles/PMC10299114/ /pubmed/37367460 http://dx.doi.org/10.3390/jimaging9060112 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Aouali, Abderezak
Chevalier, Stéphane
Sommier, Alain
Pradere, Christophe
Terahertz Constant Velocity Flying Spot for 3D Tomographic Imaging
title Terahertz Constant Velocity Flying Spot for 3D Tomographic Imaging
title_full Terahertz Constant Velocity Flying Spot for 3D Tomographic Imaging
title_fullStr Terahertz Constant Velocity Flying Spot for 3D Tomographic Imaging
title_full_unstemmed Terahertz Constant Velocity Flying Spot for 3D Tomographic Imaging
title_short Terahertz Constant Velocity Flying Spot for 3D Tomographic Imaging
title_sort terahertz constant velocity flying spot for 3d tomographic imaging
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10299114/
https://www.ncbi.nlm.nih.gov/pubmed/37367460
http://dx.doi.org/10.3390/jimaging9060112
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