Transcranial Doppler Ultrasonography

**Semantic type:** Diagnostic Procedure

**Definition:** A diagnostic technique that uses pulsed Doppler ultrasound to measure the velocity of blood flow through the major blood vessels of the brain.

**Synonyms:** - Non-imaging TCD - TCD - Transcranial Doppler - Transcranial Doppler (TCD) Ultrasonography - Transcranial Doppler Sonography - Transcranial Doppler Ultrasound