Focus-detector arrangement for generating projective or tomographic phase contrast recordings with X-ray optical gratings

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 to generate X-radiation and to irradiate the subject;
• a phase grating arranged behind the subject, to generate an interference pattern of the X-radiation in a predetermined energy range;
• and
• an analysis-detector system 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 its bars, the phase grating includes a filler material whose linear attenuation coefficient in the relevant energy range is greater than that of the bars, wherein the height of the filler material in the gaps is dimensioned on the one hand so that the X-radiation with the energy and wavelength used for measuring the phase shift generates a phase shift in the X-radiation such that, after the phase grating, the rays which pass through the bars are phase shifted by one half wavelength relative to the rays which pass through the gaps with the filler material, and on the other hand 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.