1. On-Site Sensing and Diagnosis Research Laboratory, National Institute for Advanced Industrial Science and Technology, AIST-Kyushu, 807-1 Shuku-machi, Tosu 841-0052, Japan, Department of Medical Informatics, Meiji University of Medicine, Kyoto 629-0392, Japan, and Department of Biophysics, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba 263-8555, Japan