Membranes are used in many industrial fields and, when performances of ă these processes decrease, the issue of modifying the porous structure is ă often raised. Many optical or microscopic techniques allow us to ă perfectly characterize the membrane's surface but very few allow the ă characterization of its depth. Through the comparison between a new and ă an abraded membrane, this paper presents the post-processing of images ă obtained by radiation synchrotron and associated dimensions that can be ă obtained by three-dimensional (3D) reconstruction. Thus, the whole ă thickness of the membrane is obtained from the skin to the permeate exit ă and a morphological analysis of the solid and pore phase is proposed at ă the heart of the membrane. The two-dimensional characterization allows ă one to perfectly define the mapping of the pores and to quantify by ă different comparisons the modification of the skin of a membrane after ă usage. The 3D characterization by X-ray tomography at the scale of the ă thickness of the membrane allows us to obtain the granulometric ă distribution of the different phases of the porous matrix. This ability ă to characterize both the solid and the pores is relevant to the study of ă membranes, showing not only the modification of the solid matrix but ă also highlighting pore fouling.