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Coherent Superposition in Grating-Based Directional Dark-Field Imaging

X-ray dark-field scatter imaging allows to gain information on the average local direction and anisotropy of micro-structural features in a sample well below the actual detector resolution. For thin samples the morphological interpretation of the signal is straight forward, provided that only one av...

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Autores principales: Malecki, Andreas, Potdevin, Guillaume, Biernath, Thomas, Eggl, Elena, Grande Garcia, Eduardo, Baum, Thomas, Noël, Peter B., Bauer, Jan S., Pfeiffer, Franz
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3634061/
https://www.ncbi.nlm.nih.gov/pubmed/23637802
http://dx.doi.org/10.1371/journal.pone.0061268
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author Malecki, Andreas
Potdevin, Guillaume
Biernath, Thomas
Eggl, Elena
Grande Garcia, Eduardo
Baum, Thomas
Noël, Peter B.
Bauer, Jan S.
Pfeiffer, Franz
author_facet Malecki, Andreas
Potdevin, Guillaume
Biernath, Thomas
Eggl, Elena
Grande Garcia, Eduardo
Baum, Thomas
Noël, Peter B.
Bauer, Jan S.
Pfeiffer, Franz
author_sort Malecki, Andreas
collection PubMed
description X-ray dark-field scatter imaging allows to gain information on the average local direction and anisotropy of micro-structural features in a sample well below the actual detector resolution. For thin samples the morphological interpretation of the signal is straight forward, provided that only one average orientation of sub-pixel features is present in the specimen. For thick samples, however, where the x-ray beam may pass structures of many different orientations and dimensions, this simple assumption in general does not hold and a quantitative description of the resulting directional dark-field signal is required to draw deductions on the morphology. Here we present a description of the signal formation for thick samples with many overlying structures and show its validity in experiment. In contrast to existing experimental work this description follows from theoretical predictions of a numerical study using a Fourier optics approach. One can easily extend this description and perform a quantitative structural analysis of clinical or materials science samples with directional dark-field imaging or even direction-dependent dark-field CT.
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spelling pubmed-36340612013-05-01 Coherent Superposition in Grating-Based Directional Dark-Field Imaging Malecki, Andreas Potdevin, Guillaume Biernath, Thomas Eggl, Elena Grande Garcia, Eduardo Baum, Thomas Noël, Peter B. Bauer, Jan S. Pfeiffer, Franz PLoS One Research Article X-ray dark-field scatter imaging allows to gain information on the average local direction and anisotropy of micro-structural features in a sample well below the actual detector resolution. For thin samples the morphological interpretation of the signal is straight forward, provided that only one average orientation of sub-pixel features is present in the specimen. For thick samples, however, where the x-ray beam may pass structures of many different orientations and dimensions, this simple assumption in general does not hold and a quantitative description of the resulting directional dark-field signal is required to draw deductions on the morphology. Here we present a description of the signal formation for thick samples with many overlying structures and show its validity in experiment. In contrast to existing experimental work this description follows from theoretical predictions of a numerical study using a Fourier optics approach. One can easily extend this description and perform a quantitative structural analysis of clinical or materials science samples with directional dark-field imaging or even direction-dependent dark-field CT. Public Library of Science 2013-04-23 /pmc/articles/PMC3634061/ /pubmed/23637802 http://dx.doi.org/10.1371/journal.pone.0061268 Text en © 2013 Malecki et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Malecki, Andreas
Potdevin, Guillaume
Biernath, Thomas
Eggl, Elena
Grande Garcia, Eduardo
Baum, Thomas
Noël, Peter B.
Bauer, Jan S.
Pfeiffer, Franz
Coherent Superposition in Grating-Based Directional Dark-Field Imaging
title Coherent Superposition in Grating-Based Directional Dark-Field Imaging
title_full Coherent Superposition in Grating-Based Directional Dark-Field Imaging
title_fullStr Coherent Superposition in Grating-Based Directional Dark-Field Imaging
title_full_unstemmed Coherent Superposition in Grating-Based Directional Dark-Field Imaging
title_short Coherent Superposition in Grating-Based Directional Dark-Field Imaging
title_sort coherent superposition in grating-based directional dark-field imaging
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3634061/
https://www.ncbi.nlm.nih.gov/pubmed/23637802
http://dx.doi.org/10.1371/journal.pone.0061268
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