The American GE 4D ultrasound is developed and produced by American General Corporation, and the most used one is GE730 4D ultrasound at present. Expectant mothers through the four-dimensional ultrasound, not only can see the fetus in the womb yawning, stretching, sucking fingers and other good-looking movements, but also be able to multi-directional, multi-angle observation of the growth and development of the fetus in the womb for the early diagnosis of congenital malformations of the fetus, congenital heart disease to provide an accurate scientific basis for the observation of the fetus intuitively real-time dynamic activity images.