Dr. Adam C. Denny Profile

Dr. Adam C. Denny

at Pacific Northwest National Lab

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Proceedings Article | 14 June 2023 Presentation + Paper

Spectral gratings-based phase-contrast imaging for materials characterization

Andrew Gilbert, Adam Denny, Aileen Sarceno, Richard Wittman, Erin Miller

Proceedings Volume 12531, 125310G (2023) https://doi.org/10.1117/12.2663669

KEYWORDS: X-rays, Particles, Microspheres, Scattering, Radiography, Phase contrast, Photon counting

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Spectral X-ray detectors provide a direct observation of the energy spectrum of a transmitted X-ray beam, both for typical and phase-contrast gratings-based systems. The sensitivity of a gratings-based X-ray system to small-angle deflections from a given particle size is dependent on X-ray energy. Therefore, spectral (energy-sensitive) detectors could be sensitive to particle size, even with a broad spectrum from a commercial X-ray generator. Furthermore, these detectors allow direct observation of how the X-ray spectrum is changing as the beam is passing through an object and gratings, and how this affects grating visibilities used to determine the presence of small-angle deflections. This is a particular issue for higher-energy systems where artifacts from beam hardening are common. We present results exploring the particle-size dependent signatures that are available from a spectral gratings-based phase-contrast X-ray imaging system, and the feasibility of observing them with lab-based, broad-spectrum X-ray generators.

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