Towards x-ray differential phase contrast imaging on a compact setup

T. Thüring; P. Modregger; B. R. Pinzer; Z. Wang; S. Rutishauser; C. David; T. Grund; J. Kenntner; M. Stampanoni

doi:10.1117/12.877218

16 March 2011 Towards x-ray differential phase contrast imaging on a compact setup

T. Thüring, P. Modregger, B. R. Pinzer, Z. Wang, S. Rutishauser, C. David, T. Grund, J. Kenntner, M. Stampanoni

Proceedings Volume 7961, Medical Imaging 2011: Physics of Medical Imaging; 79611G (2011) https://doi.org/10.1117/12.877218
Event: SPIE Medical Imaging, 2011, Lake Buena Vista (Orlando), Florida, United States

Abstract

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.

Citation Download Citation

T. Thüring, P. Modregger, B. R. Pinzer, Z. Wang, S. Rutishauser, C. David, T. Grund, J. Kenntner, and 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); https://doi.org/10.1117/12.877218

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