Patent ID: 7639786
Filing Date: 2009-12-29
Classification: A61B,G21K

Abstract:
1. An X-ray optical transmission grating of a focus-detector arrangement of an X-ray apparatus for generating at least one of projective and tomographic phase contrast recordings of a subject, comprising: at least one wafer including a multiplicity of grating bars and grating gaps, the grating bars and grating gaps being arranged periodically on at least one surface of the at least one wafer, wherein the X-ray optical transmission grating includes at least two sub-gratings arranged in direct succession in a beam direction, wherein a beam profile of a transmitted X-radiation is designed to be at least one of fan-shaped and conical, and the sub-gratings arranged successively in the beam direction comprise different grating periods, and wherein a grating period increases from at least one sub-grating to at least one subsequent sub-grating and the sub-gratings are arranged to be mutually aligned, so that the rays of the beam pass through only one of either of the grating gaps or the grating bars.