Our major research field is development of new radiopharmaceuticals labeled with positron emitters, gamma emitters and beta emitters. Radiopharmaceuticals are used for imaging functions of organs or tissues such as metabolism, receptor distribution, and blood flow. Recent developments of radiopharmaceuticals are closely related with molecular imaging and nanomedicine. In addition, we also develop therapeutic radiopharmaceuticals labeled with beta emitters such as Re-188, Y-90 and Lu-177.