Table 2.

Inter-reader and intra-reader intra-class correlation coefficients (ICC) with 95% confidence interval (CI).

	Inter-reader		Intra-reader
Parameter	ICC	95% CI	ICC	95% CI
Internal carotid artery
cervical segment (C1)	0.92	0.84–0.96	0.94	0.89–0.97
petrous segment (C2)	0.79	0.62–0.89	0.89	0.79–0.95
cavernous segment (C3)	0.93	0.86–0.96	0.96	0.92–0.98
supraclinoid segment (C4)	0.78	0.61–0.89	0.84	0.70–0.92
Vertebral artery
foraminal segment (V2)	0.81	0.64–0.90	0.86	0.74–0.93
atlantic segment (V3)	0.91	0.83–0.96	0.91	0.83–0.96
intradural segment (V4)	0.89	0.79–0.95	0.88	0.77–0.94
Basilar artery	0.91	0.83–0.96	0.96	0.92–0.98
Anterior cerebral artery	0.82	0.67–0.91	0.92	0.84–0.96
Middle cerebral artery	0.77	0.58–0.88	0.80	0.63–0.90
Posterior cerebral artery	0.86	0.73–0.93	0.86	0.73–0.93
Image noise	0.91	0.82–0.95	0.93	0.87–0.97
Image artifacts	0.86	0.74–0.93	0.96	0.92–0.98