Table 1.

Transcranial Doppler characteristics

Artery	Window	Depth (mm)	Direction of flow	Mean flow velocity (cm/second)
Middle cerebral	Temporal	40 to 60	Toward probe	55 ± 12
Anterior cerebral	Temporal	60 to 85	Away from probe	50 ± 11
Posterior cerebral	Temporal	60 to 70	Toward	40 ± 10
Extracranial internal carotid	Submandibular	50	Away	28 ± 17
Vertebral	Occipital	60 to 80	Away	38 ± 10
Basilar	Occipital	80 to 120	Away	41 ± 10