Effect of beam shape on techniques that use Doppler signal power for monitoring vessel size change [ultrasonic blood flow measurement]


Transcranial Doppler measurements of blood flow velocity in the middle cerebral artery are often used as the basis for non-invasive monitoring of changes in cerebral blood flow. Flow index techniques that include a measurement of signal power to take account of possible diameter changes may be hampered in this aim by non-uniform insonation of the vessel. A… (More)


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