[1] Pisa Univ Hosp, Azienda Osped Univ Pisana, Unit Med Phys, Pisa, Italy
[2] Univ Bologna, Dept Elect Elect & Informat Engn Guglielmo Marcon, Via Venezia 52, I-47521 Cesena, Italy
[3] Univ Florence, Dept Clin & Expt Biomed Sci Mario Serio, Florence, Italy
[4] Versilia Hosp, Azienda USL Toscana Nord Ovest, Radiol Unit, Lido Di Camaiore, LU, Italy