Dementia - Exams and Tests
Brain imaging tests such as CT scans and MRI may also be done to make sure another problem isn't causing the symptoms. These tests may rule out brain tumors, strokes, normal-pressure hydrocephalus, or other conditions that could cause dementia symptoms.
MRI and CT scan also can show evidence of strokes from vascular dementia.
Single photon emission CT (SPECT) and PET scan can help identify several forms of dementia, including vascular dementia and frontotemporal dementia.
In some cases, electrical activity in the brain may be measured using an electroencephalogram (EEG). Doctors seldom use this test to diagnose dementia, but they may use it to distinguish dementia from delirium and to look for unusual brain activity found in Creutzfeldt-Jakob disease, a rare cause of dementia.
In rare cases, a brain biopsy may be done if a treatable cause of dementia is suspected.
After death, an autopsy may be done to find out for sure what caused dementia. This information may be helpful to family members concerned about genetic causes.