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Proceedings Paper

Towards x-ray differential phase contrast imaging on a compact setup
Author(s): T. Thüring; P. Modregger; B. R. Pinzer; Z. Wang; S. Rutishauser; C. David; T. Grund; J. Kenntner; M. Stampanoni
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Paper 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.

Paper Details

Date Published: 16 March 2011
PDF: 8 pages
Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 79611G (16 March 2011); doi: 10.1117/12.877218
Show Author Affiliations
T. Thüring, Paul Scherrer Institute (Switzerland)
Swiss Federal Institute of Technology (Switzerland)
P. Modregger, Paul Scherrer Institute (Switzerland)
Univ. of Lausanne (Switzerland)
B. R. Pinzer, Paul Scherrer Institute (Switzerland)
Z. Wang, Paul Scherrer Institute (Switzerland)
S. Rutishauser, Swiss Federal Institute of Technology (Switzerland)
Paul Scherrer Institute (Switzerland)
C. David, Paul Scherrer Institute (Switzerland)
T. Grund, Karlsruhe Institute of Technology (KIT) (Germany)
J. Kenntner, Karlsruhe Institute of Technology (KIT) (Germany)
M. Stampanoni, Paul Scherrer Institute (Switzerland)
Swiss Federal Institute of Technology (Switzerland)

Published in SPIE Proceedings Vol. 7961:
Medical Imaging 2011: Physics of Medical Imaging
Norbert J. Pelc; Ehsan Samei; Robert M. Nishikawa, Editor(s)

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