1. Department of Radiology, Kanazawa University Graduate School of Medical Science, 13-1 Takaramachi, Kanazawa, Ishikawa 920-8641, Japan.
2. Department of Diagnostic Pathology, Kobe University Hospital, Kobe, Japan.
3. Department of Quantum Medical Imaging, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan.