The invention relates to gratings for X-ray differential phase-contrast imaging, a focus detector arrangement and X-ray system for generating phase-contrast images of an object and a method of phase-contrast imaging for examining an object of interest. In order to provide gratings with a high aspect ratio but low costs, a grating for X-ray differential phase-contrast imaging is proposed, comprising a first sub-grating (112), and at least a second sub- grating (114 116 118), wherein the sub-gratings each comprise a body structure (120) with bars (122) and gaps (124) being arranged periodically with a pitch (a), wherein the sub-gratings (112 114 116 118) are arranged consecutively in the direction of the X-ray beam, and wherein the sub-gratings (112 114 116 118) are positioned displaced to each other perpendicularly to the X-ray beam.
