Talbot Interferometry With Curved Quasiperiodic Gratings: Towards Large Field Of View X-Ray Phase-Contrast Imaging

Abstract

X-ray phase-contrast imaging based on grating interferometry has become a common method due to its superior contrast in biological soft tissue imaging. The high sensitivity relies on the high-aspect ratio structures of the planar gratings, which prohibit the large field of view applications with a diverging X-ray source. Curved gratings allow a high X-ray flux for a wider angular range, but the interference fringes are only visible within ∼10° range due to the geometrical mismatch with the commonly used flat array detectors. In this paper, we propose a design using a curved quasiperiodic grating for large field of view imaging with a flat detector array. Our scheme is numerically verified in the X-ray regime and experimentally verified in the visible optical regime. The interference fringe pattern is observed over 25°, with less than 10% of decrease in visibility in our experiments.

Publication Date

10-5-2015

Publication Title

Optics Express

Volume

23

Issue

20

Number of Pages

26576-26585

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/OE.23.026576

Socpus ID

84943737637 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84943737637

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