Department of Radiation Sciences;
Diagnostic Radiology;
Umea University;
Umea;
Sweden;
Department of Radiation Sciences;
Radiation Physics;
Umea University;
Umea;
Sweden;
Normal Material; Dementia; Alzheimer’s Disease; 99 mTc-HMPAO rCBF-SPECT; Brain Imaging; Neuropsychology; Regional Cerebral Blood Flow; Cognitive Reserve;