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The concept of contrast transfer function for edge illumination X-ray phase-contrast imaging and its comparison with the free-space propagation technique

Diemoz, PC; Vittoria, FA; Olivo, A; (2016) The concept of contrast transfer function for edge illumination X-ray phase-contrast imaging and its comparison with the free-space propagation technique. Optics Express , 24 (10) pp. 11250-11265. 10.1364/OE.24.011250. Green open access

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Abstract

Previous studies on edge illumination (EI) X-ray phase-contrast imaging (XPCi) have investigated the nature and amplitude of the signal provided by this technique. However, the response of the imaging system to different object spatial frequencies was never explicitly considered and studied. This is required in order to predict the performance of a given EI setup for different classes of objects. To this scope, in the present work we derive analytical expressions for the contrast transfer function of an EI imaging system, using the approximation of near-field regime, and study its dependence upon the main experimental parameters. We then exploit these results to compare the frequency response of an EI system with respect of that of a free-space propagation XPCi one. The results achieved in this work can be useful for predicting the signals obtainable for different types of objects and also as a basis for new retrieval methods.

Type: Article
Title: The concept of contrast transfer function for edge illumination X-ray phase-contrast imaging and its comparison with the free-space propagation technique
Location: US
Open access status: An open access version is available from UCL Discovery
DOI: 10.1364/OE.24.011250
Publisher version: http://dx.doi.org/10.1364/OE.24.011250
Language: English
Additional information: Copyright © 2016 OSA. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License (CC BY 4.0) (https://creativecommons.org/licenses/by/4.0/). Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Keywords: X-ray imaging, Image formation theory, Image analysis
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1482219
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