A method of reconstructing a 3D image data set of an examination zone in which a substantially periodically moving object to be examined is positioned. Said material with a hierarchical porosity comprising silicon is constituted by at least two elementary spherical particles, each of said spherical particles comprising zeolitic nanocrystals having a pore size in the range 0. The importance value of an html element may be defined based on the amount of clicks made on the html element in the 3D scene.