Table 4.

The correlations between CBF measurements by CDUS, MRI, and TCD.

	CDUS		PC-MRI		ASL		TCD
	Total CBF	nCBF	Total CBF	nCBF	Cortex	Global brain	CBF velocity
CDUS
Total CBF		0.819	0.629	0.400	0.300	0.271	0.461
(mL/min)		(<0.001)	(<0.001)	(<0.001)	(<0.001)	(<0.001)	(<0.001)
nCBF			0.497	0.565	0.423	0.427	0.503
(mL/100 g/min)			(<0.001)	(<0.001)	(<0.001)	(<0.001)	(<0.001)
PC-MRI
Total CBF				0.872	0.536	0.520	0.515
(mL/min)				(<0.001)	(<0.001)	(<0.001)	(<0.001)
nCBF					0.624	0.637	0.515
(mL/100 g/min)					(<0.001)	(<0.001)	(<0.001)
ASL
Cortex						0.990	0.318
(mL/100 g/min)						(<0.001)	(<0.001)
Global brain							0.311
(mL/100 g/min)							(<0.001)

Data are Pearson’s product-moment correlation coefficients and (P-values). CDUS: color-coded duplex ultrasonography; CBF: cerebral blood flow; PC-MRI: phase contrast magnetic resonance imaging; ASL: arterial spin labeling; TCD: transcranial Doppler. Global brain perfusion was calculated by gray matter and white matter perfusion.