Single Photon Emission Computed Tomography (SPECT) is a neuroimaging technique that uses a combination of computed tomography (CT) and a radioactive material (tracer) to measure regional cerebral blood flow in the brain. SPECT are typically ordered to look for areas of hypoperfusion in the brain.
Alzheimer's Dementia (AD) | Medial temporal parietal hypoperfusion is be suggestive of AD |
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Parkinson's Disease (PD)/Lewy Body Dementia | Parietal-occipital distribution of hypoperfusion (although the absence of this still does not rule out PD or DLB either. |