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Appl Opt. 2008 Aug 1;47(22):E44-52.

Phase-space evolution of x-ray coherence in phase-sensitive imaging.

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  • 1Department of Radiology, University of Alabama at Birmingham, Birmingham, Alabama 35233, USA. xwu@uabmc.edu

Abstract

X-ray coherence evolution in the imaging process plays a key role for x-ray phase-sensitive imaging. In this work we present a phase-space formulation for the phase-sensitive imaging. The theory is reformulated in terms of the cross-spectral density and associated Wigner distribution. The phase-space formulation enables an explicit and quantitative account of partial coherence effects on phase-sensitive imaging. The presented formulas for x-ray spectral density at the detector can be used for performing accurate phase retrieval and optimizing the phase-contrast visibility. The concept of phase-space shearing length derived from this phase-space formulation clarifies the spatial coherence requirement for phase-sensitive imaging with incoherent sources. The theory has been applied to x-ray Talbot interferometric imaging as well. The peak coherence condition derived reveals new insights into three-grating-based Talbot-interferometric imaging and gratings-based x-ray dark-field imaging.

PMID:
18670541
[PubMed - indexed for MEDLINE]
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