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+CT angiography
;Indications for contrast
Most CTs of the head are made without IV contrast, as there is limited advantage of contrast for initial investigations for stroke, intracranial bleeding or skeletal trauma. In the acute setting, it is also acceptable to have a CT head without contrast if a tumor is part of a list of differential diagnoses but not the most likely cause. It is then generally possible to to a complementary [[MRI of the head]] if a suspicion of a tumor remains. However, if a tumor is strongly suspected in an initial acute setting, it is usually appropriate to do a CT with and without IV contrast.
;[[CT angiography of the head]]
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>
==Normal anatomy==
