High energy x-ray phase-contrast imaging using glancing angle grating interferometers

D. Stutman; J. W. Stayman; M. Finkenthal; J. H. Siewerdsen

doi:10.1117/12.2007930

19 March 2013 High energy x-ray phase-contrast imaging using glancing angle grating interferometers

D. Stutman, J. W. Stayman, M. Finkenthal, J. H. Siewerdsen

Proceedings Volume 8668, Medical Imaging 2013: Physics of Medical Imaging; 866814 (2013) https://doi.org/10.1117/12.2007930
Event: SPIE Medical Imaging, 2013, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

The Talbot-Lau grating interferometer enables refraction based imaging with conventional X-ray tubes, offering the promise of a new medical imaging modality. The fringe contrast of the normal incidence interferometer is however insufficient at the >40 keV photon energies needed to penetrate thick body parts, because the thin absorption gratings used in the interferometer become transparent. To solve this problem we developed a new interferometer design using gratings at glancing incidence. For instance, using 120 μm thick Au gratings at 10° incidence we increased several fold the interferometer contrast for a spectrum with ~58 keV mean energy. Tests of DPC-CT at 60-80kVp using glancing angle interferometers and medically relevant samples indicate high potential for clinical applications. A practical design for a slot-scan DPC-CT system for the knee is proposed, using glancing angle gratings tiled on a single substrate.

Citation Download Citation

D. Stutman, J. W. Stayman, M. Finkenthal, and J. H. Siewerdsen "High energy x-ray phase-contrast imaging using glancing angle grating interferometers", Proc. SPIE 8668, Medical Imaging 2013: Physics of Medical Imaging, 866814 (19 March 2013); https://doi.org/10.1117/12.2007930

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