Figure 3.

Vascular frequency maps in an axial slice located just superior to the circle of Willis (top row), and at the level of the insula (bottom row), overlaid on the ICBM high-resolution T1-weighted template, showing the major outlets of the internal carotis (anterior, middle, and posterior cerebral arteries). In the posterior part of the brain major sinuses are visible. The frontal section (top left) shows the internal carotis and the smaller vessels entering the ventral striatum from below. The high vascular frequency of the deep Silvian fissure, covering the insula, is also visible. Vessels (blue labels): LSA, lenticolo-striatal arteries; AI, insular arteries; CR, carotid artery; BA, basilar artery; ST, sinus transversus; CM, middle cerebral artery; CP, posterior cerebral artery; PC, pericallosal artery; StS, straight sinus; SaS, sagittalis sinus.