Doppler ultrasound in obstetrics.
D005260:Female; D006801:Humans; D010922:Placenta Diseases / Q000000981:diagnostic imaging*; D011247:Pregnancy; D011248:Pregnancy Complications / Q000000981:diagnostic imaging*; D016216:Ultrasonography, Prenatal; D014469:Umbilical Arteries / Q000000981:diagnostic imaging