SPECT
Pronunciation: SPEKT
Also written as: SPECT — Single Photon Emission Computed Tomography
Single photon emission computed tomography, a nuclear imaging technique used to assess brain function and blood flow.
Full Definition
Single photon emission computed tomography (SPECT) is a nuclear medicine imaging technique that uses gamma ray-emitting radioisotopes to create three-dimensional images of brain function. Unlike structural imaging methods, SPECT provides functional information by measuring regional cerebral blood flow and metabolism. In neurology, SPECT is commonly used to evaluate dementia, epilepsy, stroke, and movement disorders. The procedure involves injecting a small amount of radioactive tracer that is taken up by brain tissue in proportion to blood flow and metabolic activity. SPECT imaging is particularly valuable for detecting early changes in neurodegenerative diseases and for localizing epileptic foci in surgical planning.
Usage
Usage note: Distinguish from PET scan, which uses positron-emitting tracers.
In Context
- "SPECT imaging demonstrated hypoperfusion in the temporal and parietal regions consistent with Alzheimer's disease." — Nuclear medicine report
- "The patient underwent ictal SPECT to localize the seizure focus before surgery." — Epilepsy evaluation