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Probe reconstruction for holographic X-ray imaging
In X-ray holographic near-field imaging the resolution and image quality depend sensitively on the beam. Artifacts are often encountered due to the strong focusing required to reach high resolution. Here, two schemes for reconstructing the complex-valued and extended wavefront of X-ray nano-probes,...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
International Union of Crystallography
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5330293/ https://www.ncbi.nlm.nih.gov/pubmed/28244446 http://dx.doi.org/10.1107/S160057751700128X |
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author | Hagemann, Johannes Robisch, Anna-Lena Osterhoff, Markus Salditt, Tim |
author_facet | Hagemann, Johannes Robisch, Anna-Lena Osterhoff, Markus Salditt, Tim |
author_sort | Hagemann, Johannes |
collection | PubMed |
description | In X-ray holographic near-field imaging the resolution and image quality depend sensitively on the beam. Artifacts are often encountered due to the strong focusing required to reach high resolution. Here, two schemes for reconstructing the complex-valued and extended wavefront of X-ray nano-probes, primarily in the planes relevant for imaging (i.e. focus, sample and detection plane), are presented and compared. Firstly, near-field ptychography is used, based on scanning a test pattern laterally as well as longitudinally along the optical axis. Secondly, any test pattern is dispensed of and the wavefront reconstructed only from data recorded for different longitudinal translations of the detector. For this purpose, an optimized multi-plane projection algorithm is presented, which can cope with the numerically very challenging setting of a divergent wavefront emanating from a hard X-ray nanoprobe. The results of both schemes are in very good agreement. The probe retrieval can be used as a tool for optics alignment, in particular at X-ray nanoprobe beamlines. Combining probe retrieval and object reconstruction is also shown to improve the image quality of holographic near-field imaging. |
format | Online Article Text |
id | pubmed-5330293 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | International Union of Crystallography |
record_format | MEDLINE/PubMed |
spelling | pubmed-53302932017-03-01 Probe reconstruction for holographic X-ray imaging Hagemann, Johannes Robisch, Anna-Lena Osterhoff, Markus Salditt, Tim J Synchrotron Radiat Research Papers In X-ray holographic near-field imaging the resolution and image quality depend sensitively on the beam. Artifacts are often encountered due to the strong focusing required to reach high resolution. Here, two schemes for reconstructing the complex-valued and extended wavefront of X-ray nano-probes, primarily in the planes relevant for imaging (i.e. focus, sample and detection plane), are presented and compared. Firstly, near-field ptychography is used, based on scanning a test pattern laterally as well as longitudinally along the optical axis. Secondly, any test pattern is dispensed of and the wavefront reconstructed only from data recorded for different longitudinal translations of the detector. For this purpose, an optimized multi-plane projection algorithm is presented, which can cope with the numerically very challenging setting of a divergent wavefront emanating from a hard X-ray nanoprobe. The results of both schemes are in very good agreement. The probe retrieval can be used as a tool for optics alignment, in particular at X-ray nanoprobe beamlines. Combining probe retrieval and object reconstruction is also shown to improve the image quality of holographic near-field imaging. International Union of Crystallography 2017-02-16 /pmc/articles/PMC5330293/ /pubmed/28244446 http://dx.doi.org/10.1107/S160057751700128X Text en © Johannes Hagemann et al. 2017 http://creativecommons.org/licenses/by/2.0/uk/ 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.http://creativecommons.org/licenses/by/2.0/uk/ |
spellingShingle | Research Papers Hagemann, Johannes Robisch, Anna-Lena Osterhoff, Markus Salditt, Tim Probe reconstruction for holographic X-ray imaging |
title | Probe reconstruction for holographic X-ray imaging |
title_full | Probe reconstruction for holographic X-ray imaging |
title_fullStr | Probe reconstruction for holographic X-ray imaging |
title_full_unstemmed | Probe reconstruction for holographic X-ray imaging |
title_short | Probe reconstruction for holographic X-ray imaging |
title_sort | probe reconstruction for holographic x-ray imaging |
topic | Research Papers |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5330293/ https://www.ncbi.nlm.nih.gov/pubmed/28244446 http://dx.doi.org/10.1107/S160057751700128X |
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