Fig. 2

Typical flow curves for the fetal descending aorta and umbilical vein by Doppler ultrasound (DUS) gating and metric optimized gating (MOG). An example of flow curves for the fetal descending aorta (top) and umbilical vein (bottom) from one fetus obtained using the DUS (left) and MOG (right) methods. Note the difference between methods in descending aorta peak flow and umbilical vein flow variability over time