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

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Type of Content
Journal ArticlePublisher
SPIE-Intl Soc Optical EngISSN
2329-43022329-4310
Language
engCollections
- Science: Journal Articles [1192]
Authors
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 imagingANZSRC Fields of Research
34 - Chemical sciences::3406 - Physical chemistry::340605 - Molecular imaging (incl. electron microscopy and neutron diffraction)Rights
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Speckle-Based X-Ray Dark-Field Tomography of an Attenuating Object
Alloo SJ; Paganin DM; Morgan KS; Kitchen MJ; Stevenson AW; Mayo SC; Maksimenko A; Bowden J; Li, Heyang; Kennedy, Ben; Pavlov, Konstantin (SPIE, 2021)Spatial resolution in standard phase-contrast X-ray imaging is limited by the finite number and size of detector pixels. This limits the size of features that can be seen directly in projection images or tomographic ... -
Speckle-Based X-ray Imaging: Dark-Field Tomography of a Phase Object
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Recovering refraction and attenuation information in an unknown sample using X-ray propagation-based phase-contrast tomography
Alloo SJ; Paganin DM; Morgan KS; Gureyev TE; Mayo SC; Nesterets YI; Mohammadi S; Lockie D; Menk RH; Arfelli F; Kitchen MJ; Zanconati F; Dullin C; Tromba G; Croton LCP; Pavlov K; Pavlov, Konstantin (2022)