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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...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2013
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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. |
format | Online Article Text |
id | pubmed-3634061 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
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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