Obstetric radiology.
D005260:Female; D005333:Fetus / Q000000981:diagnostic imaging* / Q000528:radiation effects; D006801:Humans; D010387:Pelvimetry; D010920:Placenta / Q000000981:diagnostic imaging*; D011247:Pregnancy; D011832:Radiation Injuries / Q000517:prevention & control; D011859:Radiography