TABLE 1:

CT angiography reader ratings*

Patient No.	Vessel	Radiographic Total Occlusion	Rating (Reader 1)	Rating (Reader 2)
1	LIC¹	Y	1	1
2	RIC²	Y	1	3
3	LIC	Y	1	5^†
4	RIC	Y	1	1
5	RIC	Y	1	2
6	RIC	Y	2	2
7	LIC	Y	1	1
8	LIC	Y	1	1
9	RIC	Y	1	1
10	RIC	Y	1	2
11	RIC	Y	1	2
12	RIC	Y	1	2
13	LIC	Y	1	1
14	LIC	Y	1	1
15	LIC	N	5	5
16	LIC	N	5	5
17	RIC	N	4	4
18	LIC	N	4	4
19	LIC	N	2	5
20	RIC	N	4	3
21	RIC	N	5	5

Note.—LIC indicates left internal carotid artery; RIC, right internal carotid artery; Y, yes; N, no;
† false positive for hairline residual lumen (occluded internal carotid artery confused with patent ascending pharyngeal artery).
* Chart shows the vessel patency ratings for both readers. Note that for patient 3, with an internal carotid artery occlusion, one reader mistook the ascending pharyngeal artery for a patent hairline internal carotid artery. 1 = definitely occluded; 2 = probably occluded; 3 = indeterminate; 4 = probably patent; and 5 = definitely patent. During data analysis, vessels with rating scores of 1 or 2 were categorized as “occluded,” whereas those with rating scores of 4 or 5 were categorized as “hairline.”