Test of Reproducibility of [15O]H20-PET Assessment of Brain Perfusion

PET imaging will be performed with a Discovery 710 PET/CT scanner (GE Healthcare, Milwaukee, WI, USA). Two 5-minute PET recordings will be performed of each subject within a single scanning session of 70 min. One 5-minute scan is conducted of the brain in rest. \[15O\]H2O, is produced on-site (GENtrace, GE, Uppsala, Sweden), and 600 MBq \[15O\]H2O is intravenously injected by an automatic Hidex Radiowater Generator (Hidex, Turku, Finland). To induce brain vasodilation, 1 g of acetazolamide is infused over 5 min and 15 min later the brain is scanned. Cerebral perfusion is calculated using PMOD software (PMOD Technologies, Switzerland).