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    Dark-field tomography of an attenuating object using intrinsic x-ray speckle tracking. (2022)

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    Type of Content
    Journal Article
    UC Permalink
    https://hdl.handle.net/10092/104089
    
    Publisher's DOI/URI
    http://doi.org/10.1117/1.jmi.9.3.031502
    
    Publisher
    SPIE-Intl Soc Optical Eng
    ISSN
    2329-4302
    2329-4310
    Language
    eng
    Collections
    • Science: Journal Articles [1112]
    Authors
    Alloo SJ
    Paganin DM
    Morgan KS
    Kitchen MJ
    Stevenson AW
    Mayo SC
    Li HT
    Maksimenko A
    Bowden JC
    Kennedy , Ben cc
    Pavlov, Konstantin cc
    show all
    Abstract

    <b>Purpose:</b> We investigate how an intrinsic speckle tracking approach to speckle-based x-ray imaging is used to extract an object's effective dark-field (DF) signal, which is capable of providing object information in three dimensions. <b>Approach:</b> The effective DF signal was extracted using a Fokker-Planck type formalism, which models the deformations of illuminating reference beam speckles due to both coherent and diffusive scatter from the sample. Here, we assumed that (a) small-angle scattering fans at the exit surface of the sample are rotationally symmetric and (b) the object has both attenuating and refractive properties. The associated inverse problem of extracting the effective DF signal was numerically stabilized using a "weighted determinants" approach. <b>Results:</b> Effective DF projection images, as well as the DF tomographic reconstructions of the wood sample, are presented. DF tomography was performed using a filtered back projection reconstruction algorithm. The DF tomographic reconstructions of the wood sample provided complementary, and otherwise inaccessible, information to augment the phase contrast reconstructions, which were also computed. <b>Conclusions:</b> An intrinsic speckle tracking approach to speckle-based imaging can tomographically reconstruct an object's DF signal at a low sample exposure and with a simple experimental setup. The obtained DF reconstructions have an image quality comparable to alternative x-ray DF techniques.

    Citation
    Alloo SJ, Paganin DM, Morgan KS, Kitchen MJ, Stevenson AW, Mayo SC, Li HT, Kennedy BM, Maksimenko A, Bowden JC, Pavlov KM (2022). Dark-field tomography of an attenuating object using intrinsic x-ray speckle tracking.. Journal of medical imaging (Bellingham, Wash.). 9(3). 031502-.
    This citation is automatically generated and may be unreliable. Use as a guide only.
    Keywords
    dark-field computed tomography; intrinsic speckle tracking; speckle x-ray imaging
    ANZSRC Fields of Research
    34 - Chemical sciences::3406 - Physical chemistry::340605 - Molecular imaging (incl. electron microscopy and neutron diffraction)
    Rights
    All rights reserved unless otherwise stated
    http://hdl.handle.net/10092/17651

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