what is transcranial doppler
An intracranial neurovascular exam is also known as a Transcranial Doppler (TCD) study. TCD is a non-invasive, painless ultrasound technique that uses high-frequency sound waves to measure the rate and direction of blood flow inside vessels.CD is a non-invasive, painless ultrasound technique that uses high-frequency sound waves to measure the rate and direction of blood flow inside vessels.