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. Now, some 30 years later, these non-invasive techniques have been adapted to diagnose disease in humans. Radionuclides are absorbed by healthy tissue at a different rate than tissue undergoing a disease process. PET Scans Many physicians in fields including cardiology, neurology, and oncology use PET Scanning.