Hey there
I didn't have a scan to pick up Parkinson's but I know a very good friend of mine did @A MyParkinsonsTeam Member
I think it's purely down to neurologists. Mine knew just looking at me that I had Parkinson's

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A MyParki...

Only a DAT SCAN can pick up PD a MRI or CT scan can only rule out other possible conditions

Mine diagnosed me very quickly then confirmed it with 2 different types of scans

For us, the scan or MRI was to rule out other possible causes of the physical symptoms the neurologist observed; Other causes such as strokes or brain tumor.

This is a great reminder that the vast % of treatment is not based on science with the majority being subject too personal detection. My cardiologist noted my behavior ( standing) and ordered a neurologic work up.