Journal Article X-ray holography X-ray microscopy X-ray near-field imaging holography nanotomography phase contrast X-ray imaging phase retrieval European XFEL Research Support, Non-U.S. Gov't X-ray diffraction X-ray imaging X-ray phase-contrast imaging XFELs Zernike phase contrast biological cells cell nucleus chromatin coherent diffractive imaging diffract-then-destroy dose resolution estimation dual beam configuration dynamical studies full-field X-ray microscopy grating interferometry holotomography multi-scale imaging multibeams near-field holography near-field ptychography