Changes

This is indicated in identification and characterization of aneurysms, stenosis or other occlusive diseases, arteriovenous malformations, vessel dissections, sinus thrombosis, idiopathic hemorrhage, and other vascular pathologies.<ref name="LianBharatha2011">{{cite journal|last1=Lian|first1=K.|last2=Bharatha|first2=A.|last3=Aviv|first3=R.I.|last4=Symons|first4=S.P.|title=Interpretation Errors in CT Angiography of the Head and Neck and the Benefit of Double Reading|journal=American Journal of Neuroradiology|volume=32|issue=11|year=2011|pages=2132–2135|issn=0195-6108|doi=10.3174/ajnr.A2678}}</ref>

Apart from any specific requests in the referral, it is appropriate to scroll through the brain in at least two planes in:

*Parenchymal window, for (at least in people over age 50-60) ischemia or stroke