Positron emission tomography (PET) is a non-invasive nuclear imaging technique which uses radioactive tracers. PET scans specifically look at the metabolism of a particular organ or tissue, and uses a tracer dependent on which organ or tissues are the focus of the scan.
PET scans are able to detect biochemical changes in an organ or tissue. These changes can be attributed to the onset of a disease process before any anatomical changes are visible on other imaging processes. Read more.