Fig. 1From: Evaluation of fetal foramen ovale blood flow by pulsed Doppler ultrasonography combined with spatiotemporal image correlationMeasurement of the foramen ovale blood velocity waveforms. The Doppler sample volume is located within the left atrium and is parallel to the transarterial flow. The transforaminal flow is bidirectional, with right-to-left flow predominatingBack to article page