Table 2.

Mean and ICC of 4D Flow MRI and Reference 2D PC‐MRI for Different Arteries

			PI (mean ± SD)		ΔV (ml) (mean ± SD)
Artery	N	4D (1.9 Hz)	2D	ICC	4D	2D	ICC
ICA	70	1.10 ± 0.23	1.10 ± 0.20	0.84	0.49 ± 0.14	0.48 ± 0.14	0.83
BA	34	1.03 ± 0.24	1.04 ± 0.20	0.59	0.24 ± 0.08	0.24 ± 0.08	0.76
MCA	70	1.02 ± 0.25	1.00 ± 0.20	0.63	0.28 ± 0.08	0.27 ± 0.08	0.62
ACA	67	0.93 ± 0.26*	1.02 ± 0.23	0.49	0.16 ± 0.06	0.16 ± 0.07	0.78
PCA	69	1.02 ± 0.28*	0.94 ± 0.15	0.37	0.11 ± 0.03**	0.10 ± 0.02	0.39

4D flow MRI, four‐dimensional flow magnetic resonance imaging; 2D PC‐MRI, two‐dimensional phase‐contrast magnetic resonance imaging; ICC, intraclass correlation; PI, pulsatility index; ΔV, volume load (ml); SD, standard deviation; ICA, internal carotid artery; BA, basilar artery; MCA, middle cerebral artery; ACA, anterior cerebral artery; PCA, posterior cerebral artery.

^*Significant difference (P < 0.05).

^**Significant difference (P < 0.001).