nuclear medicine scan
also called a radionuclide scan. A type of imaging test in which small amounts of a radioactive substance (called a radioisotope) are put into the bloodstream to look for diseases such as cancer. The radioisotope collects in certain organs, and a special camera is used to make a picture of the organ and show areas of disease. Bone scans and positron emission tomography (PET) scans are types of nuclear medicine scans. See also bone scan, imaging tests, positron emission tomography, radioisotope.