WFUMB Ultrasound Open
Normalized velocity variability: A practical measure of Doppler signal modulation in transcranial Doppler microembolic signals
By Rudolf W.M. Keunen, Geert Jan Romers and Roy Mastboom.
Abstract
Purpose
Frequency modulation (FM) is a recognized characteristic of transcranial Doppler (TCD) microembolic signals (MES), but is not routinely quantified. This study evaluated event-duration Normalized Velocity Variability (NVV), a time-weighted measure of temporal Doppler-frequency variability.
