Fig. 6
From: Vessel diameters of 14 basal cerebral arteries assessed in 1000 digital subtraction angiographies
Assessment of the basilar artery. The caliper is placed on a straight part of the artery, in between the vertebral junction and the basilar tip, then angled until parallel lining with the adjacent vessel walls. DSA, ap-projection, the diameter reads 3.74 mm. A large aneurysm of the basilar tip can be seen bulging to the right side.
