Most of the tertiary hospitals have 4-dimensional ultrasound examination programs. 4-dimensional ultrasound is based on 3-dimensional color ultrasound with the addition of time change, which means that 3-dimensional images can be obtained in real time. The clinical use is mostly for pregnancy health care and diagnosis of heart disease. If you need to have 4D ultrasound examination, you can go to the hospital to improve the relevant examination according to your personal needs.1. Pregnancy health care: 4D ultrasound is an important means to diagnose fetal malformation, and the general examination time is around 20-28 weeks of pregnancy. Through the 4D ultrasound examination, you can see the continuous dynamic and three-dimensional images, so that you can clearly see the location of the fetal malformation, and at the same time, it is easy to take measures in advance to achieve the purpose of eugenics. In addition, pregnant women can clearly see the fetal head, face, chest, abdomen, limb activities, and amniotic fluid, and even observe the changes in the expression of the fetus when the pregnancy week is larger, which also has a strong clinical value for calming pregnant women; 2, diagnose diseases: 4D B examination can also be used in various departments such as internal medicine and surgery, and can clearly view the vascular, organ, nerve, bone and other parts of the patient’s body. It can also play a positive and important role in the diagnosis of diseases, determining the severity of the disease and formulating treatment plans. In addition, 4D ultrasound also has the advantages of less trauma to the human body, less side effects, and easy operation.