Coded aperture x-ray diffraction imaging with transmission computed tomography side-information

Ikenna Odinaka; Joel A. Greenberg; Yan Kaganovsky; Andrew Holmgren; Mehadi Hassan; David G. Politte; Joseph A. O'Sullivan; Lawrence Carin; David J. Brady

doi:10.1117/12.2216915

25 March 2016 Coded aperture x-ray diffraction imaging with transmission computed tomography side-information

Ikenna Odinaka, Joel A. Greenberg, Yan Kaganovsky, Andrew Holmgren, Mehadi Hassan, David G. Politte, Joseph A. O'Sullivan, Lawrence Carin, David J. Brady

Author Affiliations +

Proceedings Volume 9783, Medical Imaging 2016: Physics of Medical Imaging; 978323 (2016) https://doi.org/10.1117/12.2216915
Event: SPIE Medical Imaging, 2016, San Diego, California, United States

Abstract

Coded aperture X-ray diffraction (coherent scatter spectral) imaging provides fast and dose-efficient measurements of the molecular structure of an object. The information provided is spatially-dependent and material-specific, and can be utilized in medical applications requiring material discrimination, such as tumor imaging. However, current coded aperture coherent scatter spectral imaging system assume a uniformly or weakly attenuating object, and are plagued by image degradation due to non-uniform self-attenuation. We propose accounting for such non-uniformities in the self-attenuation by utilizing an X-ray computed tomography (CT) image (reconstructed attenuation map). In particular, we present an iterative algorithm for coherent scatter spectral image reconstruction, which incorporates the attenuation map, at different stages, resulting in more accurate coherent scatter spectral images in comparison to their uncorrected counterpart. The algorithm is based on a spectrally grouped edge-preserving regularizer, where the neighborhood edge weights are determined by spatial distances and attenuation values.

Citation Download Citation

Ikenna Odinaka, Joel A. Greenberg, Yan Kaganovsky, Andrew Holmgren, Mehadi Hassan, David G. Politte, Joseph A. O'Sullivan, Lawrence Carin, and David J. Brady "Coded aperture x-ray diffraction imaging with transmission computed tomography side-information", Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 978323 (25 March 2016); https://doi.org/10.1117/12.2216915

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