Nuclear medicine is a branch of medical imaging that is used to diagnose abnormalities of the organs and bones, many types of cancer, and various types of other diseases. Scans involve the use of a very small amount of a radioactive isotope that is specifically designed for the organ being examined.
Depending on the study, the radioactive isotope may be administered orally, intravenously, or in the form of a gas to be inhaled. These studies are non-invasive and usually painless. The isotope will leave your body within one to two days.