Apart from X-rays, CT scan, MRI scan a few other imaging studies are used.  These include PET scan mainly which is very helpful in diagnosis of limbic encephalopahty.
Encephalopathy other imaging findings
Amnesia other imaging findings
Encephalopathy other diagnostic studies
Dementia other imaging findings
Gliomatosis cerebri other imaging findings
Brain abscess other imaging findings
Creutzfeldt-Jakob disease other imaging findings
Intracerebral metastases other imaging findings