title: Device for measurement of fetal breathing movements--I. The TD-recorder. A new system for recording the distance between two echogenerating structures as a function of time.
mesh_terms: D005260:Female; D005333:Fetus / Q000502:physiology*; D006801:Humans; D009068:Movement; D011247:Pregnancy; D012119:Respiration; D014465:Ultrasonics / Q000295:instrumentation; D014463:Ultrasonography