Patent ID: 7564941

Claim:
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: a radiation source configured to generate X-radiation and to irradiate the subject; a phase grating arranged behind the subject, the phase grating including a plurality of bars with gaps between the plurality of bars, the phase grating being configured to generate an interference pattern of the X-radiation in a predetermined energy range; and an analysis-detector system configured to detect at least the interference pattern generated by the phase grating in respect of its phase shift with position resolution, wherein in the gaps between the bars, the phase grating includes a filler material having a linear attenuation coefficient in a relevant energy range greater than a linear attenuation coefficient of the bars, and a height of the filler material in the gaps is dimensioned so that the X-radiation with an energy and wavelength used for measuring the phase shift generates a phase shift in the X-radiation such that, after the phase grating, rays of the X-radiation which pass through the bars are phase shifted by one half wavelength relative to the rays of the X-radiation which pass through the gaps with the filler material, and is dimensioned so that the attenuation of the X-radiation, at least in relation to the energy used for measuring the phase shift, is the same when passing through the bars and when passing through the filler material.