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J. Imaging 2018, 4(6), 76;

Single-Shot X-ray Phase Retrieval through Hierarchical Data Analysis and a Multi-Aperture Analyser

Department of Medical Physics and Biomedical Engineering, University College London, Gower Street, London WC1E 6BT, UK
Author to whom correspondence should be addressed.
Received: 11 May 2018 / Revised: 29 May 2018 / Accepted: 5 June 2018 / Published: 6 June 2018
(This article belongs to the Special Issue Phase-Contrast and Dark-Field Imaging)
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A multi-aperture analyser set-up was recently developed for X-ray phase contrast imaging and tomography, simultaneously attaining a high sensitivity and wide dynamic range. We present a single-shot image retrieval algorithm in which differential phase and dark-field images are extracted from a single intensity projection. Scanning of the object is required to build a two-dimensional image, because only one pre-sample aperture is used in the experiment reported here. A pure-phase object approximation and a hierarchical approach to the data analysis are used in order to overcome numerical instabilities. The single-shot capability reduces the exposure times by a factor of five with respect to the standard implementation and significantly simplifies the acquisition procedure by only requiring sample scanning during data collection. View Full-Text
Keywords: X-ray imaging; phase-contrast imaging; dark-field imaging X-ray imaging; phase-contrast imaging; dark-field imaging

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Endrizzi, M.; Vittoria, F.A.; Olivo, A. Single-Shot X-ray Phase Retrieval through Hierarchical Data Analysis and a Multi-Aperture Analyser. J. Imaging 2018, 4, 76.

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