[1] Gunma Univ, Grad Sch Med, Dept Diagnost Radiol & Nucl Med, Maebashi, Gunma 371, Japan
[2] Gunma Univ, Grad Sch Med, Dept Stomatol & Maxillofacial Surg, Maebashi, Gunma 371, Japan
[3] Gunma Univ, Grad Sch Med, Dept Bioimaging Informat Anal, Maebashi, Gunma 371, Japan
[4] Gunma Univ Hosp, Dept Radiol, Maebashi, Gunma, Japan
[5] Gunma Prefectural Cardiovasc Ctr, Dept Radiol, Maebashi, Gunma, Japan