To do four-dimensional color Doppler ultrasound, you need to go to a professional maternity hospital, which usually costs several hundred dollars. Four-dimensional color Doppler ultrasound, that is, four-dimensional imaging technology (4D), can display the three-dimensional structure of human organs intuitively and stereoscopically, and observe the three-dimensional structure dynamically in real time, while the previous two-dimensional imaging technology can only display some aspects of human organs. In obstetrics and gynecology, four-dimensional color Doppler ultrasound can examine the fetus, show the color, face and development of various organs of the fetus, and even observe the state of the fetus in the mother; It can be used for early diagnosis of fetal malformations, such as cleft lip, cleft palate, skeletal dysplasia and cardiovascular malformations.