Transcranial Doppler (TCD) is a test that measures the velocity of blood flow through the brain's blood vessels. Used to help in the diagnosis of emboli, stenosis, vasospasm from a subarachnoid hemorrhage (bleeding from a ruptured aneurysm), and other problems, this relatively quick and inexpensive test is growing in popularity in the United States.
The equipment used for these tests is becoming increasingly portable, making it possible for a clinician to travel to a hospital, doctor's office or nursing home for both inpatient and outpatient studies. It is often used in conjunction with other tests such as MRI, MRA, carotid duplex ultrasound and CT scans.
Two methods of recording may be used for this procedure. The first uses "B-mode" imaging, which displays a two-dimensional image as seen by the ultrasound probe. Once the desired blood vessel is found, blood-flow velocities may be measured with a pulsed doppler probe, which graphs velocities over time. Together, these make a duplex test. The second method of recording uses only the second probe function, relying instead on the training and experience of the clinician in finding the correct vessels.
Vascular Surgery and Laser Vein Center
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