Positron Emission Tomography (PET)

Positron emission tomography (PET) is a nuclear medical imaging technique that produces a three-dimensional (3D) image or map of functional processes in the body. The system detects pairs of gamma rays emitted indirectly by a positron-emitting radioisotope, which is introduced into the body on a metabolically active molecule. Images of metabolic activity in space are then reconstructed by computer analysis, often in modern scanners aided by results from a CT X-ray scan performed on the patient at the same time, in the same machine.