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Proceedings Paper

Spectroscopic dark-field imaging using a grating-based Talbot-Lau interferometer
Author(s): Florian Bayer; Karl Gödel; Wilhelm Haas; Jens Rieger; André Ritter; Thomas Weber; Lukas Wucherer; Jürgen Durst; Thilo Michel; Gisela Anton
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Paper Abstract

In recent years X-ray phase-contrast imaging became applicable in the hard X-ray regime through the use of a grating-based Talbot-Lau interferometer and was demonstrated to be a promising technique to gain contrast in different fields of medical imaging. In addition to absorption imaging, phase-contrast and dark-field imaging is capable to yield completely new information and is able to provide structural information about a specimen at a scale much less than imaging system-based resolution. Therefore an effective implementation of this information in medical imaging applications benefits substantially from a detailed look onto interferometer setup based effects on the phase signal. For the calculation of the dark-field signal, the loss in intensity modulation, represented by the contrast ratio V / V0, due to local scattering effects within the specimen structure is exploited. By using an energy-resolving detector, spectral effects of a X-ray tube spectrum on the interferometer image quality can be determined. In this contribution we will show first results on spectroscopic dark-field imaging, with a focus to the potential utilization on porous bone structure. Measurements were carried out using a Talbot-Lau interferometer in connection with a hybrid photon-counting semiconductor Timepix detector, which provides an adjustable lower threshold for photon detection.

Paper Details

Date Published: 3 March 2012
PDF: 7 pages
Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 83135I (3 March 2012); doi: 10.1117/12.911640
Show Author Affiliations
Florian Bayer, Univ. of Erlangen-Nürnberg (Germany)
Karl Gödel, Univ. of Erlangen-Nürnberg (Germany)
Wilhelm Haas, Univ. of Erlangen-Nürnberg (Germany)
Jens Rieger, Univ. of Erlangen-Nürnberg (Germany)
André Ritter, Univ. of Erlangen-Nürnberg (Germany)
Thomas Weber, Univ. of Erlangen-Nürnberg (Germany)
Lukas Wucherer, Univ. of Erlangen-Nürnberg (Germany)
Jürgen Durst, Univ. of Erlangen-Nürnberg (Germany)
Thilo Michel, Univ. of Erlangen-Nürnberg (Germany)
Gisela Anton, Univ. of Erlangen-Nürnberg (Germany)


Published in SPIE Proceedings Vol. 8313:
Medical Imaging 2012: Physics of Medical Imaging
Norbert J. Pelc; Robert M. Nishikawa; Bruce R. Whiting, Editor(s)

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