The present invention relates to a focus-detector arrangement (F, D) of an X-ray apparatus for generating projective or tomographic phase contrast recordings of an observed region of a subject. In at least one embodiment, the arrangement includes a radiation source (2) which emits a coherent or quasi-coherent X-radiation and irradiates the subject (7, P), a phase grating (G1) which is arranged behind the subject (7, P) in the beam path of the radiation source and generates an interference pattern of the X-radiation in a predetermined energy range, and an analysis-detector system (G2, D) which detects at least the interference pattern generated by the phase grating (G1) in respect of its phase shift with position resolution. Further, the beam path of the X-radiation used diverges in at least one plane between the focus (F) and the detector (D).