1. Department of Medical Radiological Technology Faculty of Health Sciences Kyorin University B‐307, 5‐4‐1 Shimorenjaku Mitaka‐shi Tokyo 181‐8612 Japan
2. Graduate School of Health Sciences Department of Medical Radiological Technology Faculty of Health Sciences Kyorin University B‐307, 5‐4‐1 Shimorenjaku Mitaka‐shi Tokyo 181‐8612 Japan
3. Department of Nuclear Medicine Cancer Institute Hospital Japanese Foundation for Cancer Research 3‐8‐31, Ariake, Koto Tokyo 135‐8550 Japan