Table 2:

Concordance between 1.5T/3T MRA and DSA on cerebral vascular segments in primary central nervous system vasculitis

	1.5T MR (κ; 95% CI)	3T MR (κ; 95% CI)
Intracranial internal carotid artery	1	1
A1	0.90 (0.73–1)	0.90 (0.75–1)
A2	0.83 (0.59–1)	0.83 (0.51–1)
>A2	0.57 (0.34–0.72)	0.86 (0.60–1)
M1	0.94 (0.81–1)	1
M2	0.90 (0.76–1)	0.91 (0.82–1)
>M2	0.69 (0.41–0.97)	0.74 (0.42–1)
P1	1	1
P2	0.60 (0.20–0.98)	1
>P2	0.64 (0.18–1)	1
V4	0.66 (0.38–1)	0.86 (0.62–1)
BA	0.83 (0.50–1)	1
PICA/AICA/SCA	0.88 (0.63–1)	1

Note:—BA indicates basilar artery.