FDG PET study of the brain, performed for the diagnosis of Alzheimer’s disease, if: clinical evaluation of the patient by a specialist, or in consultation with a specialist, is equivocal; and the service includes a quantitative comparison of the results of the study with the results of an FDG PET study of a normal brain from a reference database; and a service to which this item applies has not been performed on the patient in the previous 12 months; and a service to which item 61402 applies has not been performed on the patient in the previous 12 months for the diagnosis or management of Alzheimer’s disease Applicable not more than 3 times per lifetime (R)