1. Department of Radiological Technology, Hokkaido University Hospital, Sapporo, Hokkaido, Japan
2. Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, Sapporo, Hokkaido, Japan
3. Philips Japan Ltd., Tokyo, Japan
4. Department of Diagnostic Imaging, Hokkaido University Graduate School of Medicine, Hokkaido University, Sapporo, Hokkaido, Japan
5. Global Center for Biomedical Science and Engineering, Faculty of Medicine, Hokkaido University, Sapporo, Hokkaido, Japan