Proceedings ArticleDOI
Artifacts in X-ray dark-field measurements
Florian Horn,Florian Bayer,Karl C. Gödel,Wilhelm Haas,Georg Pelzer,Jens Rieger,André Ritter,Thomas Weber,Andrea Zang,Jürgen Durst,Thilo Michel,Gisela Anton +11 more
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TLDR
In this paper, the authors present results of measurements investigating the thickness-dependent behavior of dark-field imaging with a wedge-shaped, granular object with a conventional polychromatic X-ray tube together with a Talbot-Lau interferometer.Abstract:
Grating-based X-ray phase-contrast imaging with a Talbot-Lau interferometer is a promising method which
might be able to increase soft tissue contrast and to gain additional information in comparison to attenuationbased
imaging. The method provides an attenuation image, a differential phase image and a dark-field image.
A conventional polychromatic X-ray tube can be used together with a Talbot-Lau interferometer consisting of
a source grating, a phase grating and an absorption grating. The dark-field image shows information about the
sub-pixel-size granularity of the measured object. This supplemental information is supposed to be suitable in
applications, such as mammography or nondestructive testing.
In this contribution we present results of measurements investigating the thickness-dependent behavior of
dark-field imaging. The measurements are performed with a wedge-shaped, granular object with our X-ray
phase-contrast imaging set-up and calculating the dark-field image. Measurements with this special phantom
show a resurgence of visibility contrast with increasing thickness of the object after passing a minimum. The
reason of this artifact is not completely clear up to now, but might be found in attenuation effects in the object
in combination with the polychromatic X-ray spectrum or in residual amplitudes in our fitting algorithm for low
visibilities and low intensities at large thicknesses. Understandig the thickness-dependent behavior of the X-ray
dark-field advances the understanding of the formation of the dark-field image.read more
Citations
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Physics of Medical Imaging
TL;DR: This poster presents a meta-modelling architecture suitable for 3D image recognition and 3D signal-gauging and describes three algorithms that can be used to characterize the 3D structure of the eye.
Patent
A method for generating a phase-contrast dark field representation, and grating interferometer X-ray imaging system
TL;DR: In this paper, a grating interferometer and an X-ray imaging system were used for generating a phase-contrast dark field representation proposed with an object to be examined with a GRU for receiving a data set that locally resolved at least a determination of visibility.
Journal ArticleDOI
Exploration of the X-ray Dark-Field Signal in Mineral Building Materials
Benjamin Blykers,Caori Organista,Matias Kagias,Federica Marone,Marco Stampanoni,Matthieu Boone,Veerle Cnudde,Jan Aelterman +7 more
TL;DR: In this article , the authors apply X-ray dark-field tomography for the first time on four mineral building materials (quartzite, fired clay brick, fired Clay roof tile, and carbonated mineral building material), and investigate which information the darkfield signal entails on the sub-resolution space of the sample.
References
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Journal ArticleDOI
Phase retrieval and differential phase-contrast imaging with low-brilliance X-ray sources
TL;DR: In this article, a setup consisting of three transmission gratings can efficiently yield quantitative differential phase-contrast images with conventional X-ray tubes, which can be scaled up to large fields of view.
Journal ArticleDOI
Demonstration of X-Ray Talbot Interferometry
TL;DR: In this article, the first X-ray Talbot interferometry was demonstrated using a pair of transmission gratings made by forming gold stripes on glass plates, which were aligned on the optical axis of X-rays with a separation that caused the Talbot effect by the first grating.
Proceedings ArticleDOI
Tomography with grating interferometers at low-brilliance sources
TL;DR: In this paper, the coherence requirements for efficient operation of an X-ray grating interferometer are discussed, and a Talbot-Lau geometry, in which an array of equidistant secondary sources is used, can be used to decouple fringe visibility in the inter-ferometer (and thus, its efficiency) from the total size of the Xray source.
Journal ArticleDOI
Beam hardening effects in grating-based x-ray phase-contrast imaging.
Michael Chabior,Tilman Donath,Christian David,Oliver Bunk,Manfred Schuster,Christian G. Schroer,Franz Pfeiffer +6 more
TL;DR: It is shown that beam hardening leads to a similar reduction of image quality in phase-cont contrast imaging as in conventional attenuation-contrast imaging, and it is demonstrated that for homogeneous objects, beamhardening artifacts can be corrected by a linearization technique, applicable to all kinds of phase- Contrast methods using polychromatic sources.
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