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. Author manuscript; available in PMC: 2009 Sep 1.
Published in final edited form as: Ultrasound Med Biol. 2008 Apr 18;34(9):1387–1395. doi: 10.1016/j.ultrasmedbio.2008.01.015

Fig. 4.

Fig. 4

Fig. 4

Fig. 4

Fig. 4

Fig. 4

Typical Sub-Occipital Window Findings. (a) Sub-occipital coronal scan showing the junction of the left and right vertebral arteries (LVA and RVA, respectively) into the basilar artery (BA). (b) Sub-occipital parasaggital scan showing the PICA bifurcating from the LVA. (c) 3D Doppler rendering of vertebrobasilar circulation. (d) Schematic of (c). (e) Spectral Doppler trace from a BA showing velocity over the full cardiac cycle.