I Ract1, J Storey2, J Y Travers2, G Pastural2, P Gayon2, M Balu2. 1. Medical Imaging Department, Rennes University Hospital, 2, rue Henri Le Guilloux, 35033 Rennes cedex 9, France. Electronic address: isabelle.ract@gmail.com. 2. Medical Imaging Department, Felix Guyon University Hospital, Bellepierre, 97405 Saint Denis cedex, Reunion.