%D 2011 %X In this paper, the problem of localization, shaping, and reconstructing the dielectric permittivity of a dielectric target is addressed. The inversion technique processes the time-domain scattered field data to reconstruct with an increasing degree of accuracy the unknown scatterer by exploiting an iterative multiscaling procedure. Preliminary numerical results are presented to validate the time-domain multi-resolution multi-step approach. %A Luca Manica %A Giacomo Oliveri %A T. Takenaka %A K. Hong Ping %A T. Moriyama %A A. Massa %I University of Trento %K Microwave Imaging, Forward-Backward Time-Stepping Method, Iterative Multiscaling Method %T Time-Domain Inversion with the IMSA-FBTS Approach %L elediasc12448