Journal Article nanotomography Zernike phase contrast full-field X-ray microscopy in situ experiments X-ray microscopy adhesion denoising dual beam configuration fiber diffraction grating interferometry holography holotomography image quality machine learning multibeams near-field holography near-field ptychography phase contrast phase contrast X-ray imaging phase retrieval single-photon-counting detector small-angle X-ray scattering spider cuticle time resolution