Usually, when we say color Doppler ultrasound, we usually mean two-dimensional color Doppler ultrasound. Three-dimensional color Doppler ultrasound and four-dimensional color Doppler ultrasound, which are not three-dimensional or four-dimensional, are also observed by ordinary color Doppler ultrasound, and then converted into three-dimensional or four-dimensional images by software in the instrument.

What is four-dimensional color Doppler ultrasound? Four-dimensional color Doppler ultrasound is a kind of ultrasound examination. In addition to the general functions of color Doppler ultrasound, it can also image the fetal head and face stereoscopically, which can clearly show the state of eyes, nose, mouth and mandible, and can help doctors directly diagnose fetal congenital malformations, including body surface malformations, visceral malformations and head and face malformations, and determine the precise position of the fetus in the uterus. In addition, four-dimensional color Doppler ultrasound can add time dimension parameters to these functions, and can observe the dynamic moving images of the fetus in real time.

Generally speaking, four-dimensional color ultrasound can detect fetal malformation from many aspects, such as congenital heart disease, cleft lip and palate, edema fetus, polydactyly, external ear malformation and so on. However, four-dimensional color Doppler ultrasound is not omnipotent. For example, neonatal deafness and cataracts cannot be detected.

Pregnant women should understand the importance of four-dimensional color Doppler screening, and carry out four-dimensional color Doppler examination Z according to the time prescribed by the doctor.