17 March 2011 Spectroscopic measurements concerning grating-based x-ray phase-contrast imaging
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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.
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Thomas Weber, Thomas Weber, Peter Bartl, Peter Bartl, Florian Bayer, Florian Bayer, Jürgen Durst, Jürgen Durst, Wilhelm Haas, Wilhelm Haas, Thilo Michel, Thilo Michel, Georg Pelzer, Georg Pelzer, André Ritter, André Ritter, Gisela Anton, Gisela Anton, } "Spectroscopic measurements concerning grating-based x-ray phase-contrast imaging", Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 79611J (17 March 2011); doi: 10.1117/12.877224; https://doi.org/10.1117/12.877224
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