Journal Article10.1107/S1600577521001806
Generalized reverse projection method for grating-based phase tomography.
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TL;DR: A generalized reverse projection method is presented analytically for the case of non-uniform reference in grating-based phase tomography and it is believed that the method would be used widely in fast and dose-constrained imaging.
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Abstract: The reverse projection protocol results in fast phase-contrast imaging thanks to its compatibility with conventional computed-tomography scanning. Many researchers have proposed variants. However, all these reverse projection methods in grating-based phase-contrast imaging are built on the hypothesis of the synchronous phase of reference shifting curves in the whole field of view. The hypothesis imposes uniformity and alignment requirements on the gratings, thus the field of view is generally limited. In this paper, a generalized reverse projection method is presented analytically for the case of non-uniform reference in grating-based phase tomography. The method is demonstrated by theoretical derivation, numerical simulations and synchrotron radiation experiments. The influence of imaging position to sensitivity, and the phase-wrapping phenomenon are also discussed. The proposed method combines the advantages of the high efficiency of the reverse projection method and the universal applicability of the phase-stepping method. The authors believe that the method would be used widely in fast and dose-constrained imaging.
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References
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.
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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.
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X-ray phase-contrast imaging: from pre-clinical applications towards clinics
TL;DR: An overview of the main theoretical and experimental developments and of the important steps performed towards the clinical implementation of phase-contrast x-ray imaging is given.
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Differential x-ray phase contrast imaging using a shearing interferometer
TL;DR: In this paper, an x-ray interferometer was developed that uses two transmission phase gratings to analyze wave front distortions in the hard X-ray range, which was used for differential phase contrast imaging of low absorbingbing test objects.
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Hard X-Ray Phase Tomography with Low-Brilliance Sources
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