How does Transcranial Doppler (TCD) work?

During Transcranial Doppler (TCD) ultrasound, a hand-held wand called a transducer is moved over the skin near your temple. The transducer emits sound waves that then bounce off blood cells and are picked up again by the transducer. A computer interprets these sound-wave signals. TCD can provide your physician with information about the speed of blood flow in the brain. To assess stroke risk, the TCD technician or nurse may pass the wand over the carotid arteries (arteries in the neck) and arteries at the base of the brain

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