Embodiments of methods and apparatus are disclosed for obtaining a phase-contrast digital radiographic imaging system and methods for same that can include an x-ray source for radiographic imaging a beam shaping assembly including a collimator and a source grating, an x-ray grating interferometer including a phase grating, and an analyzer grating and an x-ray detector, where the phase-contrast digital radiographic imaging system and methods are adjustable for different mean energies of the x-ray source.
