Table 2. Intracranial internal carotid artery calcification score for unenhanced CT.

Characteristic		Points
Circularity	Absent	0
	Dot(s)	1
	<90 degrees	2
	90–270 degrees	3
	270–360 degrees	4
Thickness	Absent	0
	Thick ≥ 1.5mm	1
	Thin < 1.5mm	3
Morphology	Indistinguishable	0
	Irregular/Patchy	1
	Continuous	4

<7: Dominant Intimal, ≥ 7: Dominant Non-Intimal