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Crystalline phase discriminating neutron tomography using advanced reconstruction methods

Ametova, E. 1; Burca, G.; Chilingaryan, S. ORCID iD icon 2; Fardell, G.; J rgensen, J. S.; Papoutsellis, E.; Pasca, E.; Warr, R.; Turner, M.; Lionheart, W. R. B.; Withers, P. J.
1 Laboratorium für Applikationen der Synchrotronstrahlung (LAS), Karlsruher Institut für Technologie (KIT)
2 Institut für Prozessdatenverarbeitung und Elektronik (IPE), Karlsruher Institut für Technologie (KIT)

Abstract:

Time-of-flight (ToF) neutron imaging offers complementary attenuation contrast to x-ray computed tomography, coupled with the ability to extract additional information from the variation in attenuation as a function of neutron energy (ToF) at every point (voxel) in the image. In particular, Bragg edge positions provide crystallographic information and therefore enable the identification of crystalline phases directly. Here we demonstrate Bragg edge tomography with high spatial and spectral resolution. We propose a new iterative tomographic reconstruction method with a tailored regularisation term to achieve high quality reconstruction from low-count data, where conventional filtered back-projection (FBP) fails. The regularisation acts in a separated mode for spatial and spectral dimensions and favours characteristic piece-wise constant and piece-wise smooth behaviour in the respective dimensions. The proposed method is compared against FBP and a state-of-the-art regulariser for multi-channel tomography on a multi-material phantom. The proposed new regulariser which accommodates specific image properties outperforms both conventional and state-of-the-art methods and therefore facilitates Bragg edge fitting at the voxel level. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000135240
Veröffentlicht am 13.07.2021
Originalveröffentlichung
DOI: 10.1088/1361-6463/ac02f9
Scopus
Zitationen: 4
Web of Science
Zitationen: 4
Dimensions
Zitationen: 7
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Laboratorium für Applikationen der Synchrotronstrahlung (LAS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 0022-3727, 0262-8171, 0508-3443, 1361-6463, 2057-7656
KITopen-ID: 1000135240
HGF-Programm 54.12.02 (POF IV, LK 01) System Technologies
Weitere HGF-Programme 56.13.11 (POF IV, LK 01) Building Blocks of Life: Structure and Function
Erschienen in Journal of Physics D: Applied Physics
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 54
Heft 32
Seiten Art.-Nr.: 325502
Nachgewiesen in Dimensions
Web of Science
Scopus
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