Thank you for posting your query.
Based on the symptoms, your father has dementia
, and the most likely cause of his dementia is Alzheimer's disease (AD). You should note that there is no test or scan that can diagnose dementia or AD, and the CT scsn may be normal in cases of dementia.
The diagnosis of dementia is a clinical one, and can be confirmed by detailed neuropsychological testing, which can be done by a neurologist
Regarding scans, functional MRI or PET scan of the brain may be able to diagnose the problems of dementia, as the problem in dementia is a functional abnormality of the brain and the brain structure may be normal.
He should also undergo tests for vitamin B12 deficiency
problems, as that could also cause dementia.
AD can also be treated with medications.
I hope it helps.
Dr Sudhir Kumar MD DM (Neurology)
Senior Consultant Neurologist