Within a short period of time, the tracer collects in the specific body area. The patient lies comfortably on the scanning table, while a ring-shaped machine is properly positioned over the target body part. Detectors in the 350-degree ring pick up gamma rays emitted from internal body tissues. The images are often color coded according to the concentration of the tracer. Similar to a PET Scan, a radionuclide is injected intravenously.
Tissues absorb the radionuclide as it is circulated in the blood.
As a camera rotates around the patient, it picks ups photons, the radionuclide particles. This information is transferred to a computer that converts the data onto film. The amount of radioactive material injected is minimal. It is quickly broken down by the body and passed within 48 hours. Temporarily increasing fluid intake for a day or two following the test can help facilitate elimination of the tracing substance.