Dependent upon the request from your doctor, the procedure involves the injection, swallowing or inhalation of
a small amount of a chemical substance tagged with a radioactive tracer – a radiopharmaceutical. The radiopharmaceuticals
give off gamma rays and are designed to concentrate in the part of the body being investigated, where there
could be an abnormality or disease, e.g. skeleton, lungs, heart or liver. A special camera – a gamma camera
then moves around the body, providing a series of images of the radioactivity occurring in that area.