1. Research Center for Advanced Science and Technology, The University of Tokyo, Meguro, Tokyo 153-8904, Japan
2. Isotope Science Center, The University of Tokyo, Bunkyo, Tokyo 113-0032, Japan
3. JFE Engineering Corporation, Yokohama, Kanagawa 230-8611, Japan
4. Institute of Engineering Innovation, School of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
5. Department of Diagnostic Radiology and Nuclear Medicine, Saitama Medical Center, Saitama Medical University, Kawagoe, Saitama 350-8550, Japan