A CT scan is commonly performed, although this modality (as is noted below) may not have optimal sensitivity for the diffuse metabolic changes associated with<unk>  in a patient who shows no gross neurological problems (such as paralysis or weakness) on neurological exam. CT may suggest normal pressure hydrocephalus, a potentially reversible cause of<unk> , and can yield information relevant to other types of<unk> , such as infarction (stroke) that would point at a vascular type of<unk> .
In most cases, MRI is preferred over CT because it is more sensitive for a broad range of potential pathologies while avoiding exposure to potentially harmful ionizing radiation. Neuroimaging usually shows cerebral atrophy, ventriculomegaly, Ischemic cerebrovascular disease, microhemorrhages.
Dementia CT
Dementia MRI
Alzheimer's disease CT scan
Alzheimer's disease MRI
Parkinson's disease CT
Alzheimer's disease ultrasound
Amnesia MRI
Amnesia CT