Fig. 2

3D TOF-MRA, coronal, and sagittal pre-enhanced T1W VWI images of tuning fork (a–c), walking (d–f), and lambda (g–i) configurations of VBA, presented sequentially. Arrows indicate BAs, and arrow heads indicate left and right VAs. The rectangle labeled stenosis of BA lumina resulted from atherosclerotic plaque (d,e). 3D TOF-MRA 3-dimensional time-of-flight magnetic resonance angiography, T1W T1-weighted, VWI vessel wall imaging, VBA vertebrobasilar artery, BA basilar artery, VA vertebral artery.