Nuclear Medicine

The clinical discipline concerned with the diagnostic and theraputic uses of radionuclides (an isotope of artificial or natural origin that exhibits radioactivity), excluding the therapeutic use of sealed radiation sources. Certain imaging procedures, including PET...

Nucleus

The center of the cell containing the genetic information (genes and chromosomes, DNA, etc.). The appearance of the nucleus is used as a criterion to determine the malignant potential of a cell or tissue.