1. Department of Radiology; Shinshu University School of Medicine; Matsumoto, Nagano Japan
2. Division of Radiology; Shinshu University Hospital; Matsumoto, Nagano Japan
3. GE Healthcare Japan; Matsumoto, Nagano Japan
4. Diagnostic Imaging Center; The Canter Institute Hospital of Japanese Foundation for Cancer Research; Matsumoto, Nagano Japan