Department of Nuclear Medicine performs diagnosis, treatment, and clinical research using radioactive isotopes. Nuclear medicine uses radiopharmaceuticals, but radioactive substances used for diagnosis are managed in a safe amount for human beings, and radiation doses are equivalent to those of other radiological examinations. Also, since the concentration of medicine contained in radiopharmaceuticals is very small, it is characterized that side effects of medicine are extremely small. Report of side effect is only about 1 in 100,000 cases. The advantage of nuclear medicine diagnosis is that it is minimally invasive and safe only with intravenous injection, that the function of the organ can be locally measured, and that it can be tested at a time for the whole body examination. Information obtained by nuclear medicine examination contributes to the treatment strategy for patients. Usually, image is captured after an intravenous injection of the test drug is done and then the drug is sufficiently distributed in the body. Depending on the examination, some cases need multiple times of injections or imaging, and last over several days.