A result that is not likely to occur randomly, but rather is likely to be attributable to a specific cause. Statistical significance can be strong or weak, and is important to research in many math-and science-related fields, including medicine, sociology, psychology and biology.
A nuclear scan is an imaging test that uses imaging technology and trace amounts of radioactive materials, called radiotracers, to diagnose and monitor diseases and treatments. Nuclear scans can show the structure and function of most body organs and tissues.
Nuclear imaging tests measure the pattern of blood flow to the heart muscle. They are used in several ways: 1  To evaluate areas of damaged heart muscle after a heart attack. 2  Tracers are absorbed by healthy tissue at a different rate than by diseased or damaged tissue. 3  On a nuclear scan, areas of the heart muscle not receiving a good blood supply may appear as cold spots..