In the minds of many pregnant women, four-dimensional color Doppler ultrasound seems to be used to take pictures of the fetus, but in fact, the purpose of four-dimensional examination is much more than that. Li Qiuming, former deputy chief physician of the Imaging Department of Guangzhou Women and Infants Hospital, said that four-dimensional color Doppler ultrasound is mainly used to detect fetal congenital malformations and congenital heart disease. She also reminded that special precautions should be taken when conducting four-dimensional color ultrasound examinations.