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
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Journal ArticleDOI
Designing the phase grating for Talbot-Lau phase-contrast imaging systems: a simulation and experiment study.
TL;DR: There is a lot of room for improvement by varying the duty cycle of the phase-shifting grating G1, and by employing a third-integer duty cycle the authors can increase the visibility to up to 53 % in a laboratory setup with a polychromatic spectrum.
Journal ArticleDOI
A preclinical Talbot–Lau prototype for x-ray dark-field imaging of human-sized objects
Christian Hauke,Christian Hauke,Peter Bartl,Martino Leghissa,Ludwig Ritschl,Sven-Martin Sutter,Tom Weber,Josef Zeidler,Jörg Freudenberger,Thomas Mertelmeier,Marcus Radicke,Thilo Michel,Gisela Anton,Felix G. Meinel,Andrea Baehr,Sigrid Auweter,David Bondesson,Thomas Gaass,Julien Dinkel,M. F. Reiser,Katharina Hellbach +20 more
TL;DR: It is demonstrated that a dedicated design of a Talbot-Lau interferometer can be applied to medical imaging by constructing a preclinical Talbot -Lau prototype capable of imaging human-sized objects with proper image quality at clinically acceptable dose levels and the phase-stepping approach is suitable for clinical practice.
Journal ArticleDOI
Energy weighted x-ray dark-field imaging
Georg Pelzer,Andrea Zang,Gisela Anton,Florian Bayer,Florian Horn,Manuel Kraus,Jens Rieger,André Ritter,Johannes Wandner,Thomas Weber,Alex Fauler,Michael Fiederle,W. Wong,Michael Campbell,Jan Meiser,Pascal Meyer,Jürgen Mohr,Thilo Michel +17 more
TL;DR: It is demonstrated that the dark-field image quality can be enhanced with an energy-resolving pixel detector and a method for contrast-noise-ratio (CNR) enhancement is proposed and validated experimentally.
Journal ArticleDOI
Design of Acquisition Schemes and Setup Geometry for Anisotropic X-ray Dark-Field Tomography (AXDT)
TL;DR: This work presents an efficient approach to measure scattering orientations spread over the unit sphere and proves its efficacy using the knowledge from conventional tomography, and concludes that placing the gratings such that the grating bars make an angle of 45 degrees with respect to the vertical direction is the optimal setup configuration for AXDT.
Journal ArticleDOI
Review and experimental verification of x-ray dark-field signal interpretations with respect to quantitative isotropic and anisotropic dark-field computed tomography.
TL;DR: In this paper, the Yashiro-Lynch model was used to describe the anisotropic signals of fibrous objects in X-ray and neutron dark-field images and was experimentally verified both in radiographic and tomographic imaging in a monochromatic synchrotron setting.
References
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Journal ArticleDOI
X-ray phase imaging with a grating interferometer.
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
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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
TL;DR: The X-ray phase tomography of biological samples is reported in this paper, which is based on Xray Talbot interferometry, and imaging results obtained for a cancerous rabbit liver and a mouse tail with synchrotron radiation are presented.
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