1. A method, comprising: providing an x-ray source for radiographic imaging; providing a beam shaping assembly comprising a source grating G0; providing an x-ray grating interferometer comprising a phase grating G1, and an analyzer grating G2; providing an x-ray detector; aligning the source grating G0, the phase grating G1, the analyzer grating G2, and the x-ray detector; offsetting a pitch of the analyzer grating G2 relative to a pitch of an interference pattern produced by the phase grating G1 at a prescribed distance from the phase grating G1 to generate a repeating fringe pattern; repeatedly exposing an object using the x-ray source while moving the object relative to at least one cycle of the fringe pattern to generate a set of image data, and while holding the x-ray source, the source grating G0, the phase grating G1, the analyzer grating G2, and the x-ray detector fixed relative to each other; and capturing a plurality of images of the object by the x-ray detector.