Operator auditory perception and spectral quantification of umbilical artery Doppler ultrasound signals
OBJECTIVE: An experienced sonographer can by listening to the Doppler audio signals perceive various timbres that distinguish different types of umbilical artery flow despite an unchanged pulsatility index (PI). Our aim was to develop an objective measure of the Doppler audio signals recorded from fetoplacental circulation in a sheep model.METHODS: Various degrees of pathological flow velocity wav