Changes

Aneurysms are more readily visualized by thick slices such as 15mm, but thin slices such as 1.2 mm still need to be observed if there may be a focal occlusion or stenosis.

In addition to a '''[[CT_of_the_head#Basic_screening|Basic screening of a head CT]]''', look for:

*Discrepancies between the left and right side regarding contrast filling of arteries. Direct comparisons can be made between stems of major arteries, while for lesser branches it is enough to compare the overall artery coverage in cerebral and cerebellar volumes.