Fig. 4From: Evaluation of fetal foramen ovale blood flow by pulsed Doppler ultrasonography combined with spatiotemporal image correlationRegression slopes show a good correlation between gestational age (GA) and foramen ovale flow velocity–time integral (FO-VTI). (Regression slope of FO-VTI = -45.55 + 6.92GA -0.09GA2; r = .70, P < .0001)Back to article page