Table 2:

4D and 2D PCMRI-based estimations on arterial net flow

	Vessel Type	n	Net Flow 4D Mean ± SD (mL/s)	Net Flow 2D Mean ± SD (mL/s)	Difference Mean ± SD (mL/s)	P Value
All	BA	10	2.15 ± 0.58	2.18 ± 0.49	0.03 ± 0.34	.787
	ICA	20	3.72 ± 0.70	4.02 ± 0.62	0.29 ± 0.40	.004
	ICA^a	20	3.81 ± 0.71
	MCA	20	2.54 ± 0.36	2.26 ± 0.34	−0.28 ± 0.29	<.001
	ACA	19	1.47 ± 0.52	1.44 ± 0.49	−0.02 ± 0.21	.627
ΔHR	BA	4	2.16 ± 0.89	2.02 ± 0.74	−0.13 ± 0.39	.538
<5%	ICA	8	4.04 ± 0.51	4.32 ± 0.51	0.28 ± 0.43	.108
	MCA	8	2.58 ± 0.27	2.46 ± 0.42	−0.12 ± 0.23	.173
	ACA	11	1.55 ± 0.61	1.49 ± 0.61	−0.06 ± 0.26	.427

Note:—BA indicates basilar artery; ICA, internal carotid artery; MCA, middle cerebral artery; ACA, anterior cerebral artery; ΔHR, difference in heart rate; ΔV, volume of arterial pulsatility.
↵a Indicates proximal ICA measurement for internal consistency analyses.