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ST: Fachverband Strahlen- und Medizinphysik
ST 5: Imaging with Ionizing Radiation I
ST 5.5: Vortrag
Donnerstag, 17. März 2011, 11:00–11:15, POT 112
Performance optimization of an X-ray grating interferometer for biomedical imaging — •Marian Willner1, Dieter Hahn1, Johannes Kenntner2, Arne Tapfer1, Martin Bech1, Martin Dierolf1, Pierre Thibault1, Julia Herzen1, Klaus Achterhold1, Jürgen Mohr2, and Franz Pfeiffer1 — 1Department of Physics (E17) and Institute of Medical Engineering (IMETUM), Technische Universität München, Germany — 2Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
Several phase-sensitive X-ray imaging methods have been developed and demonstrated the high potential to improve soft-tissue contrast compared to conventional absorption imaging. Whereas most of the methods require coherent synchrotron radiation, X-ray grating interferometry has been successfully adapted to work with incoherent sources like standard X-ray tubes as well and is a promising candidate to introduce phase-contrast imaging into the clinics. The experimental setup of an X-ray grating interferometer consists of three optical X-ray gratings. An important performance factor of the imaging system is the visibility, which highly depends on the shape of the effective spectrum, the geometrical adjustment of the gratings and the gratings themselves. The optimization of these parameters to push the visibility to the greatest possible extent is an essential goal on the way towards clinical applications. Here, we present an approach to evaluate the quality of a grating interferometer that will help to design high-visibility setups in the future and thus to establish phase-contrast imaging with high contrast-to-noise ratios at low dose levels in clinical diagnostics.