Scans can not diagnose Alzhemiers.
The doctor is talking about brain degeneration or shrinkage.
This is a non specific finding and does not provide a diagnosis, as it happens with ageing.
To diagnose alzheimers requires testing that is clinical, such as the mental status exam.
This can be done by a clinical psychologist, psychiatrist, or neurologist, or a GP if trained.
The likelyhood of degenerative brain disease can be established in this way, and then a neurology consult is in order.
Scans will not diagnose Alzheimers however.
OK, so that is an initial answer….
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