An X-ray tomography device for providing a 3D image of asample comprising a X-ray source, a cell, a photondetector and a processing unit. The processing unitcomputes the 3D image on the basis of the imagescorresponding to a plurality of cell angles. The devicefurther comprises a first and a second gratings having agrating period (Pe) lower than 200 nm, and amicroscope between the second grating and the detector.
