patterns in blood vessels with the directional ultrasonic Doppler technique through a transcutaneous approach. Jap Circ J 37: 735, 1973 37. Kalmanson D, Aigueperse J, Veyrat C, Cornec C, Chiche P: Noninvasive technique for diagnosing congenital and acquired ventricular septal defects using directional Doppler ultrasound. Correlations with phasic flow velocity patterns of the shunt. Br Heart J 3...