positron emission tomography
Nuclear imaging technique using radioactive tracers to measure brain metabolism and function.
Full Definition
Positron emission tomography (PET) is a nuclear medicine imaging technique that uses positron-emitting radiopharmaceuticals to visualize metabolic processes in the brain. Common tracers include fluorodeoxyglucose (FDG) for glucose metabolism and specific ligands for neurotransmitter systems or protein aggregates. In neurology, PET scanning aids in diagnosing dementia, evaluating seizure foci, assessing brain tumors, and research into neurodegenerative diseases. The technique provides functional information complementing structural imaging from CT or MRI.
Usage
Usage note: Specify tracer used (FDG, amyloid, tau) and clinical indication; distinguish from SPECT imaging.
In Context
- "FDG positron emission tomography revealed hypometabolism in bilateral parietal regions." — Nuclear medicine report
- "Amyloid PET imaging showed significant tracer retention consistent with Alzheimer's pathology." — Dementia evaluation report