1. Department of Radiological Physics and Technology, National Center for Global Health and Medicine, Tokyo, Japan.
2. Department of Radiological Technology, National Cancer Center Hospital East, Chiba, Japan.
3. Division of Nuclear Medicine, Department of Radiology, National Center for Global Health and Medicine, Tokyo, Japan.
4. Department of Integrated Image Information Analysis, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan.