[1] Azienda Osped Univ, Policlin Umberto I, Dept Med Phys, Rome, Italy
[2] Azienda Osped San Camillo Forlanini, Dept Nucl Med, Rome, Italy
[3] Sapienza Univ Rome, Dept Radiol Oncol & Anatomo Pathol Sci, Rome, Italy
[4] Sapienza Univ Rome, Postgrad Sch Med Phys, Rome, Italy