Diverse imaging technologies have been invented during the last decades to uncover the hidden parts of objects of interest for diagnostic, evaluation, accident prevention, etc. The key issue is to produce a faithful image of details buried in the bulk of matter. In this work we describe a new way to achieve this goal by cleverly exploiting the propagation property of gamma radiation in material medium. The proposed scanning device is simple and can rapidly collect measurements necessary to reconstruct the sought image. The relevance and reliability of this procedure is demonstrated by efficient algorithms and numerical simulations.