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


Thüring, T; Modregger, P; Pinzer, B R; Wang, Z; Rutishauser, S; David, C; Grund, T; Kenntner, J; Stampanoni, M (2010). Towards x-ray differential phase contrast imaging on a compact setup. In: 10th International Conference on X-Ray Microscopy, Chicago, Illinois, (USA), 15 August 2010 - 20 August 2010, 79611G.

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.

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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Additional indexing

Item Type:Conference or Workshop Item (Speech), refereed, original work
Communities & Collections:04 Faculty of Medicine > Institute of Biomedical Engineering
Dewey Decimal Classification:170 Ethics
610 Medicine & health
Event End Date:20 August 2010
Deposited On:20 Mar 2012 10:17
Last Modified:05 Apr 2016 15:31
ISSN:0277-786X
Additional Information: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, 79611G (2011); http://dx.doi.org/10.1117/12.877218
Publisher DOI:10.1117/12.877218

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