PET scan

Positive Emission Tomography
X-rays, CT scans, and MRIs show the shape and structure of the body’s organs and tissues. A PET scan shows them at work. A small dose of a radionuclide is injected into a vein. The radionuclide gives off positively charged energy particles (positrons). The scanner rotates around the body, detecting the positrons from many angles and creating detailed images