X-ray CT system to generate tomographic phase contrast or dark field exposures
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United States of America Patent
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Aug 30, 2011
Grant Date -
Apr 1, 2010
app pub date -
Sep 24, 2009
filing date -
Sep 24, 2008
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Abstract
An x-ray CT system that generates tomographic phase contrast or dark field exposures, has at least one grating interferometer with three grating structures arranged in series in the radiation direction, with a modular design of the second and third grating structures. The distance between the first grating structure of the x-ray source and the second grating structure (fashioned as a phase grating) of the respective grating/detector modules is adapted, depending on the fan angle, corresponding to a period of the grating structure of the x-ray source projected onto the grating detector module at a respective fan angle (.phi..sub.i).
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