[1] Univ Fukui, Biomed Imaging Res Ctr, Fukui 910, Japan
[2] Univ Fukui, Fac Engn, Fukui 910, Japan
[3] IBA, Sterling, VA USA
[4] IBA Chem Cyclotron, Louvain, Belgium
[5] SCETI KK, Tokyo, Japan
[6] Natl Inst Radiol Sci, Mol Imaging Ctr, Chiba 260, Japan