Blood flow detection by an intersecting zone ultrasonic Doppler unit.
D001011:Aorta / Q000502:physiology; D001783:Blood Flow Velocity; D001790:Blood Physiological Phenomena; D005260:Female; D005312:Fetal Blood / Q000502:physiology; D006801:Humans; D010920:Placenta / Q000502:physiology; D011247:Pregnancy; D014465:Ultrasonics / Q000295:instrumentation*; D014463:Ultrasonography