Transcranial Doppler

Optical & ultrasound (in vivo) · reads

Transcranial Doppler is a noninvasive ultrasound study that measures blood-flow velocity in major intracranial arteries. Low-frequency ultrasound at 2 MHz or below passes through relatively thin bone windows to insonate the basal cerebral arteries. Received echoes are processed into a velocity waveform with peak systolic and end-diastolic values. The frequently used transtemporal window can insonate the middle, anterior and posterior cerebral arteries and terminal internal carotid artery.

Spatial resolution

5–15 mm

Temporal resolution

2.5–4.61 ms

Field of view

216 cm³

Reads

cerebral blood-flow velocity

Destructive?

non-destructive

Prerequisites

none beyond ordinary participation

Description

Transcranial Doppler is a noninvasive ultrasound study that measures blood-flow velocity in major intracranial arteries. Low-frequency ultrasound at 2 MHz or below passes through relatively thin bone windows to insonate the basal cerebral arteries. Received echoes are processed into a velocity waveform with peak systolic and end-diastolic values. The frequently used transtemporal window can insonate the middle, anterior and posterior cerebral arteries and terminal internal carotid artery.

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