Fig. 5
From: Vessel diameters of 14 basal cerebral arteries assessed in 1000 digital subtraction angiographies
Assessment of the left vertebral artery, injected from the left side. The caliper is placed 2 to 3 mm proximal to the junction of the vertebral arteries forming the basilar artery, and angled until parallel lining of its branches with the adjacent vessel walls is achieved. DSA, ap-projection, the diameter reads 3.35 mm.
