Spectroscopic dark-field imaging using a grating-based Talbot-Lau interferometer

Florian Bayer; Karl Gödel; Wilhelm Haas; Jens Rieger; André Ritter; Thomas Weber; Lukas Wucherer; Jürgen Durst; Thilo Michel; Gisela Anton

doi:10.1117/12.911640

3 March 2012 Spectroscopic dark-field imaging using a grating-based Talbot-Lau interferometer

Florian Bayer, Karl Gödel, Wilhelm Haas, Jens Rieger, André Ritter, Thomas Weber, Lukas Wucherer, Jürgen Durst, Thilo Michel, Gisela Anton

Author Affiliations +

Proceedings Volume 8313, Medical Imaging 2012: Physics of Medical Imaging; 83135I (2012) https://doi.org/10.1117/12.911640
Event: SPIE Medical Imaging, 2012, San Diego, California, United States

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.

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Florian Bayer, Karl Gödel, Wilhelm Haas, Jens Rieger, André Ritter, Thomas Weber, Lukas Wucherer, Jürgen Durst, Thilo Michel, and Gisela Anton "Spectroscopic dark-field imaging using a grating-based Talbot-Lau interferometer", Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 83135I (3 March 2012); https://doi.org/10.1117/12.911640

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