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Proceedings Paper

Spectroscopic measurements concerning grating-based x-ray phase-contrast imaging
Author(s): Thomas Weber; Peter Bartl; Florian Bayer; Jürgen Durst; Wilhelm Haas; Thilo Michel; Georg Pelzer; André Ritter; Gisela Anton
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Paper Abstract

We present energy-dependent measurement results, regarding grating-based X-ray phase-contrast imaging. These were done using a Talbot grating interferometer according to the proposal made by Weitkamp et al.1 using a commercial microfocus X-ray tube producing a standard tungsten spectrum and a Talbot-Lau grating interferometer with a medical X-ray tube. The spectroscopic, pixelated, photon-counting Timepix detector was used for photon detection. Using these setups, we measured the visibilities for different energies at different source to phase-grating distances. These results showed a constant maximum visibility, shifting to higher energies increasing the distance. This behaviour can be explained by changing the distance leads to a change in the setup's effective design energy. The results also showed that the expected drop of visibility for a misaligned setup does not take place when a polychromatic X-ray source is used. Additionally, images obtained with phase-contrast imaging at different energy thresholds are presented and evaluated. This knowledge about the energy-dependency of the setup's parameters will help to optimise X-ray phase-contrast imaging towards the clinical application.

Paper Details

Date Published: 17 March 2011
PDF: 6 pages
Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 79611J (17 March 2011); doi: 10.1117/12.877224
Show Author Affiliations
Thomas Weber, Friedrich-Alexander-Univ. of Erlangen-Nürnberg (Germany)
Peter Bartl, Friedrich-Alexander-Univ. of Erlangen-Nürnberg (Germany)
Florian Bayer, Friedrich-Alexander-Univ. of Erlangen-Nürnberg (Germany)
Jürgen Durst, Friedrich-Alexander-Univ. of Erlangen-Nürnberg (Germany)
Wilhelm Haas, Friedrich-Alexander-Univ. of Erlangen-Nürnberg (Germany)
Thilo Michel, Friedrich-Alexander-Univ. of Erlangen-Nürnberg (Germany)
Georg Pelzer, Friedrich-Alexander-Univ. of Erlangen-Nürnberg (Germany)
André Ritter, Friedrich-Alexander-Univ. of Erlangen-Nürnberg (Germany)
Gisela Anton, Friedrich-Alexander-Univ. of Erlangen-Nürnberg (Germany)

Published in SPIE Proceedings Vol. 7961:
Medical Imaging 2011: Physics of Medical Imaging
Norbert J. Pelc; Ehsan Samei; Robert M. Nishikawa, Editor(s)

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