Mr. Mark Shafer Profile

Mark Shafer

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Proceedings Article | 19 March 2014 Paper

Optimization of grating-based phase-contrast imaging setup

Pavlo Baturin, Mark Shafer

Proceedings Volume 9033, 90334X (2014) https://doi.org/10.1117/12.2043108

KEYWORDS: X-rays, Digital signal processing, Phase shifts, Sensors, Modulation transfer functions, Absorption, X-ray imaging, Wave propagation, X-ray detectors, Modulation

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Phase contrast imaging (PCI) technology has emerged over the last decade as a novel imaging technique capable of probing phase characteristics of an object as complimentary information to conventional absorption properties. In this work, we identified and provided a rationale for optimization of key parameters that determine the performance of a Talbot-Lau PCI system. The study used the Fresnel wave propagation theory and system geometry to predict optimal grating alignment conditions necessary for producing maximum-phase contrast. The moiré fringe pattern frequency and angular orientation produced in the X-ray detector plane were studied as functions of the gratings’ axial rotation. The effect of axial displacement between source-to-phase (L) and phase-to-absorption (d) gratings, on system contrast, was discussed in detail. The L-d regions of highest contrast were identified, and the dependence of contrast on the energy of the X-ray spectrum was also studied. The predictions made in this study were tested experimentally and showed excellent agreement. The results indicated that the PCI system performance is highly sensitive to alignment. The rationale and recommendations made should serve as guidance in design, development, and optimization of Talbot-Lau PCI systems.

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