Table 4.

Detection rates of major cerebral arteries through the acoustic windows in 3-D Doppler imaging at 1.8 MHz (Lindsey et al. 2011) versus outside the acoustic windows at 1.2 MHz

Doppler scanning frequency	Probe placement	Detection rates
		ACA	ICA	MCA	PCA	Echo landmarks
1.8 MHz	Within temporal acoustic windows	1/4	8/8	8/8	6/8	4/4
1.2 MHz	Outside of acoustic windows	4/5	8/10	9/10	3/10	8/10

ACA = anterior cerebral artery; ICA = internal carotid artery; MCA = middle cerebral artery; PCA = posterior cerebral artery.