Focus-detector arrangement with X-ray optical grating for phase contrast measurement

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:

• an X-ray source with a focus, arranged on a first side of the subject, to generate a beam of rays;
• a phase grating arranged on the opposite second side of the subject in the beam path, 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 at least one grating of the focus-detector arrangement includes, at least partially, a macroscopically homogeneous medium which, when excited by an energy source, includes periodic structure variations that lead to interference phenomena when the X-ray beam passes through.