title: Reconstruction of scalar and vectorial components in X-ray dark-field tomography.
abstract: Grating-based X-ray dark-field imaging is a novel technique for obtaining image contrast for object structures at size scales below setup resolution. Such an approach appears particularly beneficial for medical imaging and nondestructive testing. It has already been shown that the dark-field signal depends on the direction of observation. However, up to now, algorithms for fully recovering the orientation dependence in a tomographic volume are still unexplored. In this publication, we propose a reconstruction method for grating-based X-ray dark-field tomography, which models the orientation-dependent signal as an additional observable from a standard tomographic scan. In detail, we extend the tomographic volume to a tensorial set of voxel data, containing the local orientation and contributions to dark-field scattering. In our experiments, we present the first results of several test specimens exhibiting a heterogeneous composition in microstructure, which demonstrates the diagnostic potential of the method.
authors.affiliation: Erlangen Centre for Astroparticle Physics and.
authors.forename: Florian L
authors.initials: FL
authors.lastname: Bayer
authors.affiliation: Pattern Recognition Lab, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany.
authors.forename: Shiyang
authors.initials: S
authors.lastname: Hu
authors.affiliation: Pattern Recognition Lab, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Maier
authors.affiliation: Erlangen Centre for Astroparticle Physics and.
authors.forename: Thomas
authors.identifier: http://orcid.org/0000-0003-1294-0908
authors.initials: T
authors.lastname: Weber
authors.affiliation: Erlangen Centre for Astroparticle Physics and.
authors.forename: Gisela
authors.initials: G
authors.lastname: Anton
authors.affiliation: Erlangen Centre for Astroparticle Physics and.
authors.forename: Thilo
authors.initials: T
authors.lastname: Michel
authors.affiliation: Pattern Recognition Lab, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany christian.riess@fau.de.
authors.forename: Christian P
authors.initials: CP
authors.lastname: Riess
mesh_terms: D000465:Algorithms; D016880:Anisotropy; D010367:Arachis / Q000648:ultrastructure; D020811:Biomedical Technology / Q000295:instrumentation / Q000379:methods; D007368:Interferometry / Q000295:instrumentation* / Q000379:methods*; D008962:Models, Theoretical; D019047:Phantoms, Imaging; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000295:instrumentation / Q000379:methods; D012542:Scattering, Radiation; D014054:Tomography / Q000295:instrumentation* / Q000379:methods*; D014934:Wood / Q000648:ultrastructure; D014965:X-Rays
keywords: X-ray phase contrast; anisotropic scattering; grating interferometer; microstructure orientation