Combined one- and two-dimensional ultrasound system for monitoring fetal breathing movements.Br Med J 1976; 2 doi: http://dx.doi.org/10.1136/bmj.2.6042.975 (Published 23 October 1976) Cite this as: Br Med J 1976;2:975
- J W Wladimiroff,
- C M Ligtvoet,
- J A Spermon
A combined one- and two-dimensional ultrasonic system for monitoring respiratory movements in the human fetus has been developed. A real-time cross-sectional image of the fetal chest at the level of the fetal heart can be obtained, and a time motion recording of fetal respiratory movements can then be written on a strip-chart recorder. Combining the features of one-dimensional and two-dimensional systems produces an accurate means of investigating fetal breathing movements.