MRI study and acquisition
TOF
The scan protocol included a T1-weighted structural scan (TR/TE = 2040/4.7 ms, flip angle 8°, FOV 200 mm, voxel size 1.0 mm isotropic), Time-of-Flight (TOF) MRA (TR/TE = 23/8 ms, flip angle 10°, FOV 300 mm voxel size 1.6×1.2×5.0 mm) and multi-delay vessel-encoded pseudocontinuous Arterial Spin Labelling (ASL; TR/TE = 4.05/14 ms, voxel size 3.4x3.4x5 mm, post-labeling delays 0.25, 0.5, 0.75, 1.0, 1.25, 1.5 s)(