Is the system B more comprehensive than the four dimensions?

Pregnant women after pregnancy is necessary to regularly go to the hospital check-up, to be able to grasp the baby's development in a timely manner. System b ultrasound is mainly screening fetal structure is abnormal, and according to the four-dimensional mainly can make fetal face like photos presented, to pregnant women and doctors intuitive feelings, conducive to the communication between doctors and pregnant women. There is a certain difference between them, the outstanding points are not the same, so it is not to say that the system B is more comprehensive than the four-dimensional, in fact, as long as the baby is healthy, the rest are trivial.