Journal Article ptychography X-ray imaging Research Support, Non-U.S. Gov't aberration correction coherent diffraction phase plate refractive X-ray optics Proteins Published Erratum Ronchi interferometer X-ray X-ray fluorescence X-ray ptychography compound refractive lens crystal perfection energy bandwidth full-field microscopy image formation theory multilayer monochromator nuclei phase contrast phase retrieval phase-contrast imaging pink beam quantitative phase imaging radiation damage scanning transmission X-ray microscopy synchrotron transmission X-ray microscope