Journal Article X-ray imaging 3DXRD X-ray microscopy compound refractive lens wavefront propagation Research Support, Non-U.S. Gov't X-ray diffraction X-ray optics bone dark-field X-ray microscopy diffraction microstructure imaging geometrical optics indexing multigrain crystallography neutron imaging phase retrieval phase-contrast imaging polychromatic neutrons ray transfer matrix structural materials three-dimensional X-ray diffraction microscopy tomography