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Proceedings Paper

Design of a compact high-energy setup for x-ray phase-contrast imaging
Author(s): Markus Schüttler; Andre Yaroshenko; Martin Bech; Guillaume Potdevin; Andreas Malecki; Michael Chabior; Johannes Wolf; Arne Tapfer; Jan Meiser; Danays Kunka; Maximilian Amberger; Jürgen Mohr; Franz Pfeiffer
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Paper Abstract

The main shortcoming of conventional biomedical x-ray imaging is the weak soft-tissue contrast caused by the small differences in the absorption coefficients between different materials. This issue can be addressed by x-ray phasesensitive imaging approaches, e.g. x-ray Talbot-Lau grating interferometry. The advantage of the three-grating Talbot-Lau approach is that it allows to acquire x-ray phase-contrast and dark-field images with a conventional lab source. However, through the introduction of the grating interferometer some constraints are imposed on the setup geometry. In general, the grating pitch and the mean x-ray energy determine the setup dimensions. The minimal length of the setup increases linearly with energy and is proportional to p2, where p is the grating pitch. Thus, a high-energy (100 keV) compact grating-based setup for x-ray imaging can be realized only if gratings with aspect-ratio of approximately 300 and a pitch of 1-2 μm were available. However, production challenges limit the availability of such gratings. In this study we consider the use of non-binary phase-gratings as means of designing a more compact grating interferometer for phase-contrast imaging. We present simulation and experimental data for both monochromatic and polychromatic case. The results reveal that phase-gratings with triangular-shaped structures yield visibilities that can be used for imaging purposes at significantly shorter distances than binary gratings. This opens the possibility to design a high-energy compact setup for x-ray phase-contrast imaging. Furthermore, we discuss different techniques to achieve triangular-shaped phase-shifting structures.

Paper Details

Date Published: 19 March 2014
PDF: 8 pages
Proc. SPIE 9033, Medical Imaging 2014: Physics of Medical Imaging, 90334Y (19 March 2014); doi: 10.1117/12.2042892
Show Author Affiliations
Markus Schüttler, Technische Univ. München (Germany)
Karlsruher Institut für Technologie (Germany)
Andre Yaroshenko, Technische Univ. München (Germany)
Martin Bech, Technische Univ. München (Germany)
Lund Univ. (Sweden)
Guillaume Potdevin, Technische Univ. München (Germany)
Andreas Malecki, Technische Univ. München (Germany)
Michael Chabior, Technische Univ. München (Germany)
Johannes Wolf, Technische Univ. München (Germany)
Arne Tapfer, Technische Univ. München (Germany)
Jan Meiser, Karlsruher Institut für Technologie (Germany)
Danays Kunka, Karlsruher Institut für Technologie (Germany)
Maximilian Amberger, Karlsruher Institut für Technologie (Germany)
Jürgen Mohr, Karlsruher Institut für Technologie (Germany)
Franz Pfeiffer, Technische Univ. München (Germany)

Published in SPIE Proceedings Vol. 9033:
Medical Imaging 2014: Physics of Medical Imaging
Bruce R. Whiting; Christoph Hoeschen, Editor(s)

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