16 March 2011 Towards x-ray differential phase contrast imaging on a compact setup
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A new imaging setup, aimed to perform differential X-ray phase contrast (DPC) imaging with a Talbot interferometer on a microfocus X-ray tube, is demonstrated. The main features compared to recently proposed setups are an extremely short source to detector distance, high spatial resolution and a large field of view. The setup is designed for an immediate integration into a industrial micro CT scanner. In this paper, technical challenges of a compact setup, namely the critical source coherence and divergence, are discussed. A theoretical analysis using wave optics based computer simulations is performed to estimate the DPC signal visibility and the size of the field of view for a given setup geometry. The maximization of the signal visibility as a function of the inter-grating distance yields the optimal grating parameters. Imaging results using the optimized grating parameters are presented. The reduction of the field of view, being a consequence of the high beam divergence, was solved by fabricating new, cylindrically bent diffraction gratings. The fabrication process of these gratings required a change of the currently used wafer materials and an adaption of the manufacturing techniques. The implementation of the new setup represents a major step forward for the industrial application of the DPC technique.
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T. Thüring, T. Thüring, P. Modregger, P. Modregger, B. R. Pinzer, B. R. Pinzer, Z. Wang, Z. Wang, S. Rutishauser, S. Rutishauser, C. David, C. David, T. Grund, T. Grund, J. Kenntner, J. Kenntner, M. Stampanoni, M. Stampanoni, } "Towards x-ray differential phase contrast imaging on a compact setup", Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 79611G (16 March 2011); doi: 10.1117/12.877218; https://doi.org/10.1117/12.877218


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