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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,...

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Autores principales: Hagemann, Johannes, Robisch, Anna-Lena, Osterhoff, Markus, Salditt, Tim
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Union of Crystallography 2017
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.
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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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