Nuclear medicine addresses the body's physiological processes rather than the anatomical structure. In nuclear imaging, short-lived radioactive materials that emit gamma rays (radiopharmaceuticals) are injected into a patient's bloodstream and are attracted to the particular organ being analysed. A gamma camera then takes a time-exposure image of the pharmaceutical as it concentrates in the tissues or organs or enters the bloodstream.
Nuclear medicine is used also in medical treatment; the radiopharmaceuticals go directly to the organ being treated. This subunit focuses only on medical imaging
