Hard x-ray gratings-based phase contrast imaging with a spectroscopic detector

Andrew J. Gilbert; Richard S. Wittman; Luke W. Campbell; Nikhil Deshmukh; Richard E. Jacob; Dustin M. Kasparek; Mital A. Zalavadia; Erin A. Miller

doi:10.1117/12.2589850

12 April 2021 Hard x-ray gratings-based phase contrast imaging with a spectroscopic detector

Andrew J. Gilbert, Richard S. Wittman, Luke W. Campbell, Nikhil Deshmukh, Richard E. Jacob, Dustin M. Kasparek, Mital A. Zalavadia, Erin A. Miller

Author Affiliations +

Proceedings Volume 11738, Anomaly Detection and Imaging with X-Rays (ADIX) VI; 1173803 (2021) https://doi.org/10.1117/12.2589850
Event: SPIE Defense + Commercial Sensing, 2021, Online Only

Abstract

Gratings-based phase contrast X-ray imaging provides additional materials signatures in textured media based on the deflection of the X-ray beam. Using this technique with a hard (~160 kVp) X-ray spectrum has shown potential for improved materials discrimination in applications such as explosives detection. Typical phase contrast measurements rely on relatively broad bremsstrahlung spectra, resulting in measurement responses averaged across wide energy ranges. Here, we present results for gratings-based phase contrast measurements using a spectroscopic imaging detector. This allows for direct observation of phase-contrast material cross sections as a function of energy, without the need for a mono-energetic X-ray source. Further, the measurements provide a direct understanding of spectral variations and a technical basis for application of hard X-ray gratings-based phase contrast measurements in the presence of attenuating materials.

Conference Presentation

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Andrew J. Gilbert, Richard S. Wittman, Luke W. Campbell, Nikhil Deshmukh, Richard E. Jacob, Dustin M. Kasparek, Mital A. Zalavadia, and Erin A. Miller "Hard x-ray gratings-based phase contrast imaging with a spectroscopic detector", Proc. SPIE 11738, Anomaly Detection and Imaging with X-Rays (ADIX) VI, 1173803 (12 April 2021); https://doi.org/10.1117/12.2589850

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