Methods
Two methods of recording may be used for this procedure. The first uses "B-mode" imaging, which displays a 2-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 effect 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.
Read more about this topic: Transcranial Doppler
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