1. University of L'Aquila,DISIM Dept.,Italy
2. Medical Physics Unit, San Salvatore Hospital, ASL1,Abruzzo,Italy
3. University of L'Aquila,DISCAB Dept.,Italy
4. University of L'Aquila,MESVA Dept.,Italy
5. Institute of Molecular Bioimaging and Physiology (IBFM-CNR),Cefalù, Palermo,Italy