Patent ID: 7433444
Filing Date: 2008-10-07
Classification: A61B,G21K

Abstract:
1. A focus-detector arrangement of an X-ray apparatus for generating at least one of projective and tomographic phase contrast recordings of an observed region of a subject, comprising: a radiation source to emit at least one of a coherent and quasi-coherent X-radiation and to irradiate the subject; a phase grating, arranged behind the subject in a direction of a beam path from the radiation source, to generate an interference pattern of the X-radiation in an energy range; and an analysis-detector system including an analyzer grating, to detect at least the interference pattern generated by the phase grating in respect of its phase shift with position resolution, wherein the beam path of the X-radiation used diverges in at least one plane between the focus and the detector, wherein the following geometrical relationship is satisfied: where d corresponds to the distance between the phase grating G 1 and the analyzer grating G 2 , r 1 corresponds to the distance between the radiation source and the phase grating, g 2 corresponds to the period of the analyzer grating (G 2 ), and g 1 corresponds to the period of the phase grating (G 1 ).