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The influence of strain on image reconstruction in Bragg coherent X-ray diffraction imaging and ptychography

A quantitative analysis of the effect of strain on phase retrieval in Bragg coherent X-ray diffraction imaging is reported. It is shown in reconstruction simulations that the phase maps of objects with strong step-like phase changes are more precisely retrieved than the corresponding modulus values....

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Detalles Bibliográficos
Autores principales: Kim, Chan, Scholz, Markus, Madsen, Anders
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Union of Crystallography 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8284403/
https://www.ncbi.nlm.nih.gov/pubmed/34212879
http://dx.doi.org/10.1107/S160057752100477X
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author Kim, Chan
Scholz, Markus
Madsen, Anders
author_facet Kim, Chan
Scholz, Markus
Madsen, Anders
author_sort Kim, Chan
collection PubMed
description A quantitative analysis of the effect of strain on phase retrieval in Bragg coherent X-ray diffraction imaging is reported. It is shown in reconstruction simulations that the phase maps of objects with strong step-like phase changes are more precisely retrieved than the corresponding modulus values. The simulations suggest that the reconstruction precision for both phase and modulus can be improved by employing a modulus homogenization (MH) constraint. This approach was tested on experimental data from a highly strained Fe–Al crystal which also features antiphase domain boundaries yielding characteristic π phase shifts of the (001) superlattice reflection. The impact of MH is significant and this study outlines a successful method towards imaging of strong phase objects using the next generation of coherent X-ray sources, including X-ray free-electron lasers.
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spelling pubmed-82844032021-08-02 The influence of strain on image reconstruction in Bragg coherent X-ray diffraction imaging and ptychography Kim, Chan Scholz, Markus Madsen, Anders J Synchrotron Radiat Research Papers A quantitative analysis of the effect of strain on phase retrieval in Bragg coherent X-ray diffraction imaging is reported. It is shown in reconstruction simulations that the phase maps of objects with strong step-like phase changes are more precisely retrieved than the corresponding modulus values. The simulations suggest that the reconstruction precision for both phase and modulus can be improved by employing a modulus homogenization (MH) constraint. This approach was tested on experimental data from a highly strained Fe–Al crystal which also features antiphase domain boundaries yielding characteristic π phase shifts of the (001) superlattice reflection. The impact of MH is significant and this study outlines a successful method towards imaging of strong phase objects using the next generation of coherent X-ray sources, including X-ray free-electron lasers. International Union of Crystallography 2021-06-01 /pmc/articles/PMC8284403/ /pubmed/34212879 http://dx.doi.org/10.1107/S160057752100477X Text en © Kim, Scholz and Madsen 2021 https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
spellingShingle Research Papers
Kim, Chan
Scholz, Markus
Madsen, Anders
The influence of strain on image reconstruction in Bragg coherent X-ray diffraction imaging and ptychography
title The influence of strain on image reconstruction in Bragg coherent X-ray diffraction imaging and ptychography
title_full The influence of strain on image reconstruction in Bragg coherent X-ray diffraction imaging and ptychography
title_fullStr The influence of strain on image reconstruction in Bragg coherent X-ray diffraction imaging and ptychography
title_full_unstemmed The influence of strain on image reconstruction in Bragg coherent X-ray diffraction imaging and ptychography
title_short The influence of strain on image reconstruction in Bragg coherent X-ray diffraction imaging and ptychography
title_sort influence of strain on image reconstruction in bragg coherent x-ray diffraction imaging and ptychography
topic Research Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8284403/
https://www.ncbi.nlm.nih.gov/pubmed/34212879
http://dx.doi.org/10.1107/S160057752100477X
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