Projection angle dependence in grating-based X-ray dark-field imaging of ordered structures
Florian Bayer,Simon Zabler,Christian Brendel,Georg Pelzer,Jens Rieger,André Ritter,Thomas Weber,Thilo Michel,Gisela Anton +8 more
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TLDR
This contribution attempts to extend existing models for 2D projections to 3D data by analyzing dark-field contrast tomography of anisotropically structured materials such as carbon fiber reinforced carbon (CFRC).Abstract:
Over the recent years X-ray differential phase-contrast imaging was developed for the hard X-ray regime as produced from laboratory X-ray sources. The technique uses a grating-based Talbot-Lau interferometer and was shown to yield image contrast gain, which makes it very interesting to the fields of medical imaging and non-destructive testing, respectively. In addition to X-ray attenuation contrast, the differential phase-contrast and dark-field images provide different structural information about a specimen. For the dark-field even at length scales much smaller than the spatial resolution of the imaging system. Physical interpretation of the dark-field information as present in radiographic and tomographic (CT) images requires a detailed look onto the geometric orientation between specimen and the setup. During phase-stepping the drop in intensity modulation, due to local scattering effects within the specimen is reproduced in the dark-field signal. This signal shows strong dependencies on micro-porosity and micro-fibers if these are numerous enough in the object. Since a grating-interferometer using a common unidirectional line grating is sensitive to X-ray scattering in one plane only, the dark-field image is influenced by the fiber orientations with respect to the grating bars, which can be exploited to obtain anisotropic structural information. With this contribution, we attempt to extend existing models for 2D projections to 3D data by analyzing dark-field contrast tomography of anisotropically structured materials such as carbon fiber reinforced carbon (CFRC).read more
Citations
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Journal ArticleDOI
Trochoidal X-ray Vector Radiography: Directional dark-field without grating stepping
Yash Sharma,Yash Sharma,Shivaji Bachche,Masashi Kageyama,Masaru Kuribayashi,Franz Pfeiffer,Tobias Lasser,Atsushi Momose +7 more
TL;DR: In this paper, a method of performing X-ray vector radiography (XVR) of a continuously moving sample without the need of any grating motion is presented. But this method is not suitable for industrial applications such as the scanning of samples on a conveyor belt.
Journal ArticleDOI
A 3-D Projection Model for X-ray Dark-field Imaging
Lina Felsner,Shiyang Hu,Andreas Maier,Johannes Bopp,Veronika Ludwig,Gisela Anton,Christian Riess +6 more
TL;DR: This work proposes a very general 3-D projection model under the assumption that the observed scatter distribution has a Gaussian shape and theoretically shows the consistency of the model with existing, more constrained 2-D models and experimentally shows the compatibility with simulations and real dark-field measurements.
Advanced Acquisition Methods for Anisotropic X-ray Dark-field Imaging
TL;DR: Development of optimized and industrially compatible AXDF acquisition protocols is the main goal of this thesis, and a method for fast two dimensional AXDF imaging of continuously moving samples is presented and two approaches to design tomographic acquisition schemes for optimal sampling of the real and reciprocal space are presented.
Proceedings ArticleDOI
Quantitative phase contrast and X-ray scattering micro-tomography with the 9.2 keV liquid metal jet anode: applications on materials and life science
TL;DR: In this article, a comparison of propagation-based phase contrast (in-line phase contrast) and differential phase contrast is presented, and the complementary contrast modes of attenuation and differential contrast are provided.
Posted Content
A 3-D Projection Model for X-ray Dark-field Imaging
TL;DR: In this paper, a general 3D projection model is proposed to define the dark-field signal dependent on an arbitrarily chosen ray and sensitivity direction, under the assumption that the observed scatter distribution has a Gaussian shape.
References
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Journal ArticleDOI
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Timm Weitkamp,Ana Diaz,Christian David,Franz Pfeiffer,Marco Stampanoni,Peter Cloetens,Eric Ziegler +6 more
TL;DR: Using a high-efficiency grating interferometer for hard X rays (10-30 keV) and a phase-stepping technique, separate radiographs of the phase and absorption profiles of bulk samples can be obtained from a single set of measurements.
Journal ArticleDOI
Hard-X-ray dark-field imaging using a grating interferometer
Franz Pfeiffer,Franz Pfeiffer,Martin Bech,Oliver Bunk,P. Kraft,E. F. Eikenberry,Christian Brönnimann,Christian Grünzweig,Christian David +8 more
TL;DR: This letter reports a new approach on the basis of a grating interferometer that can efficiently yield dark-field scatter images of high quality, even with conventional X-ray tube sources and is fully compatible with conventional transmission radiography and a recently developed hard-X-ray phase-contrast imaging scheme.
Journal ArticleDOI
Holotomography: Quantitative phase tomography with micrometer resolution using hard synchrotron radiation x rays.
Peter Cloetens,Wolfgang Ludwig,José Baruchel,D. Van Dyck,J. Van Landuyt,J.P. Guigay,Michel Schlenker +6 more
TL;DR: In this article, a holographic reconstruction procedure combining images taken at different distances from the specimen was developed, which results in quantitative phase mapping and, through association with threedimensional reconstruction, in holotomography, the complete three-dimensional mapping of the density in a sample.
Journal ArticleDOI
On the origin of visibility contrast in x-ray Talbot interferometry
TL;DR: The visibility-reduction contrast observed by x-ray grating interferometry can be understood in relation to the structural parameters of the microstructures, and the relation between the three parameters and the features of the micron-sized structures is discussed.
Journal ArticleDOI
Phase Tomography by X-ray Talbot Interferometry for Biological Imaging
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