1 Section of Diagnostic Imaging, Department of Surgical and Biomedical Sciences, Santa Maria della Misericordia Hospital, University of Perugia, S. Andrea delle Fratte, 06156 Perugia, Italy.
2 Departments of Engineering † and.
3 Department of Radiology, Oncology, and Anatomy Pathology, Policlinico Umberto I, University Sapienza, Rome, Italy ‡.
4 Surgical and Biomedical Sciences, § University of Perugia, Perugia, Italy.