Regensburg 2013 – wissenschaftliches Programm

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ST: Fachverband Strahlen- und Medizinphysik

ST 3: Advances in X-Ray Imaging II

ST 3.3: Vortrag

Mittwoch, 13. März 2013, 17:20–17:40, H41

Energy-dependence of visibility contrast in Talbot-Lau X-ray imaging — •Georg Pelzer, Florian Bayer, Florian Horn, Jens Rieger, André Ritter, Peter Sievers, Thomas Weber, Andrea Zang, Jürgen Durst, Thilo Michel, and Gisela Anton — ECAP - Erlangen Centre for Astroparticle Physics, Universität Erlangen-Nürnberg, Erwin- Rommel-Straße 1, 91058 Erlangen

A Talbot-Lau interferometer is a compact laboratory setup for phase-contrast imaging that can be used with a usual polychromatic X-ray source. Operating this setup with a broad spectrum is followed by a cutback in performance in comparison to monochromatic illumination. By evaluating the interferometer's complex energy-dependent response and using the information obtained by an energy-resolving detector, the performance might be increased again. Therefore, the energetic behaviour of the dark-field image was investigated. In simulations the energy dependence of the dark-field signal generated by small glass spheres was calculated and in order to verify these simulations, measurements using a Timepix detector were done. The results of the measurements show a good agreement with the simulations. In this contribution these results will be presented and the behaviour of the dark-field contrast will be discussed.