A focus-detector arrangement of an X-ray apparatus is disclosed for
generating projective or tomographic phase contrast recordings with a
phase grating. According to at least one embodiment of the invention, 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. The height of the filler material in the
gaps is dimensioned on the one hand so that the X-radiation with the
energy 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. Further, the
height of the filler material in the gaps 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.