Patent ID: 7817777
Filing Date: 2010-10-19
Classification: A61B,G21K,H01J

Abstract:
1. A focus detector arrangement for an x-ray apparatus for generating projection or tomographic phase contrast exposures of an examination subject, comprising: a radiation source located at a first side of the examination subject, that generates a beam of coherent x-ray radiation with a grid-like origin; a phase grid located in a path of said beam at an opposite, second side of the examination subject, said phase grid comprising spaced-apart grid lines that diffract adjacent coherent rays in said beam to generate an interference pattern of the x-ray radiation in a predetermined energy range of the x-ray radiation dependent on a phase shift of the x-ray beam produced by tissue of the examination subject; an analysis-detector system that detects at least said interference pattern generated by said phase grid relative to a local intensity distribution thereof, to determine a local phase shift; and said radiation source comprising an anode from which said beam of coherent x-ray radiation with a grid-like origin is emitted, said anode comprising regions with respectively different radiation emission characteristics proceeding in spaced-apart bands that are parallel to the grid lines of the phase grid.