It is accurate to say that there is 4D ultrasound imaging technology, which is what we call a 4D ultrasound examination. The 4D ultrasound examination is operated on a color ultrasound machine. Only when the examination is done, its imaging technology is 4D ultrasound imaging technology. Generally, the ultrasound machines with 4D imaging technology are medium to high end models and above. There are both three-dimensional and four-dimensional modes of operation within the instrument, which can be selected according to the different needs of the clinic. Four-dimensional ultrasound is the real-time three-dimensional ultrasound, based on two-dimensional and three-dimensional ultrasound data acquisition and display, processing speed is faster, the image is clearer. In clinical examination, the face of the fetus is displayed using 3D and 4D surface imaging modes, and you can choose the area you are interested in to be imaged, such as the face, and after imaging, you can clearly see whether the structure of the fetal face is normal or not. It can even be rotated to view it from all angles. 3D and 4D reconstruction can also be performed in tomographic and transparent imaging modalities when there are abnormalities in the intracranial structures or the fetal skeletal system. 3D and 4D ultrasound have been perfected over the last 20 years and are now the most important part of the obstetrics and gynecology field. In clinical practice 4D ultrasound is a very common auxiliary examination, and the big 4D ultrasound machines in each hospital are mostly a popular state.