“…At tissue level of organization, microscopy techniques attempting to visualize the tissue rebuilding process, such as light, fluorescence, scanning and transmission electron microscopy are limited to two-dimensional (2D) local information or, otherwise, require laborious three-dimensional (3D) reconstruction of serial sections. In-vivo imaging methods, including MRI, PET and micro-CT, have the potential to play a major role in the setting attempting to allow quantification of the rebuilding process, including longitudinal cell tracking (Badea et al, 2006;De Vries et al, 2005;Dhodapkar et al, 2001;Schambach et al, 2010). On the other hand, current radiologic 3D-methods, possess intrinsic limitations to identify the localization and fate of the injected cells in both clinical (Frangioni & Hajjar , 2004) and experimental (Li et al,2009;Toyama et al, 2004;Kudo et al, 2002;Schelbert et al, 2003) settings.…”