Imaging in Moyamoya Disease - Study to Investigate Different Imaging Technologies for a Better Understanding of Various Imaging Techniques to Evaluate Cerebral Hemodynamics, Disease-activity and Possibly the Etiology in Moyamoya Patients

Patients will get special MRI sequences (CO2-triggered BOLD MRI, Vessel-wall imaging, resting state BOLD MRI) to identify cerebral vasoreactivity and disease activity.

Patients will get H2 15O PET/CT with acetazolamide challenge to define the cerebral vasoreserve for comparison with fMRI Images

Patients do get a venous puncture for blood analysis on circulating endothelial cells and virus PCR analysis