Comparison of a 1-MHz and a 2-MHz probe for microembolus detection using transcranial Doppler ultrasound

Objectives: Clinically silent microembolic signals (MES) can be detected by transcranial Doppler sonography (TCD). There is theoretical evidence that lower ultrasound emission frequencies may lead to a higher signal intensity and thus sensitivity to detect MES. We compared a 1-MHz probe with a 2-MHz...

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