Biodistribution, Pharmacokinetics, and Safety of F-18 THK-5351 PET in Alzheimer's Disease Patients and Healthy Subjects.(Positron Emission Tomograph )

Totally 24 subjects age 20-90 including 12 healthy cognitively intact subjects and 12 probably AD patients with NINCDS-ADRDA criteria. For disease subjects, caregiver should be able to report activities of daily living and their mental status. Patient should be able to give informed consent or have a caregiver give consent with subject assent.