1. Department of Radiological Technology, Faculty of Medical Sciences Kyoto College of Medical Science Kyoto Japan
2. Department of Neurosurgery, Division of Medicine, Faculty of Medical Sciences University of Fukui Fukui Japan
3. Department of Medical Image Sciences, Faculty of Life Sciences Kumamoto University Kumamoto Japan
4. GE Healthcare Tokyo Japan
5. Department of Radiology, Graduate School of Medicine The University of Tokyo Tokyo Japan
6. Radiological Center University of Fukui Hospital Fukui Japan
7. Faculty of Medical Sciences University of Fukui Fukui Japan
8. Radiology Section National Health Insurance Echizen‐cho Ota Hospital Fukui Japan
9. Department of Radiology, Faculty of Medical Sciences University of Fukui Fukui Japan