Lu Hong, member of the Standing Committee of the Obstetrics and Gynecology Professional Committee of the Ultrasound Branch of the China Imaging Technology Research Association, said Lu Hong, director of the Department of Ultrasound Diagnosis, affiliated to the Obstetrics and Gynecology Hospital of Zhejiang University School of Medicine. In fact, "In our doctors, there is no 'four-dimensional' argument. The accurate statement should be It is 'real-time three-dimensional'. The so-called 'four-dimensional' is to add time dimension on the basis of three-dimensional, real-time imaging, probe sweeping, baby frowning, grinning movements, can be seen."
Listening to a very tall, but Lu Hong said that whether it is a three-dimensional B-ultrasound or "four-dimensional" B-ultrasound, the emotional demand is far greater than the medical needs, mainly to let the father and mother look at the child's small hands and feet, but from the doctor's point of view Look, the medical value is actually limited.
"The role of B-ultrasound is mainly to check whether the fetus has congenital malformations and defects, but the prenatal diagnosis is mainly based on two-dimensional imaging to judge." She said that although the four-dimensional can make the mother see the child's behavior in the womb, but it is significant Malformation, diagnosis is more important in a two-dimensional plane.
Lu Hong said that prenatal diagnosis through ultrasound has higher requirements for doctors' qualifications. About one-fourth of the doctors in our department have this qualification.
It seems that a widely spread view in the mother, "do three-dimensional B-ultrasound, four-dimensional B-ultrasound is equivalent to malformation screening", in fact, is a misunderstanding, troubleshooting the conventional two-dimensional B-ultrasound can be.
Although there is no "four-dimensional color ultrasound" in many ultrasound examinations in public hospitals, Lu Hong explained that in fact, many devices that do three-dimensional B-mode ultrasound have the function of real-time imaging, and they want to see what the child looks like. Like mom and dad, she is willing to satisfy their curiosity, as long as the position is right, give an image.
But if the position is not good, try it twice or not, she usually advises her mother to give up, because too much ultrasound may cause harm to the fetus, even if the damage is not necessarily visible to the naked eye.
The US FDA (US Food and Drug Administration) also warns that ultrasound may cause two kinds of injuries: warming and cavitation of human tissue. The phenomenon of cavitation is the ultrasonic pressure on the tissue. Once the pressure is too high, the small bubbles generated by the tissue fluid are torn and burst, which will generate hundreds of atmospheric pressure and local high temperature in an instant.
General ultrasound diagnostic instructions, there will be a safety risk reminder: the most important thing is to use the smallest possible dose to obtain the necessary diagnostic information, so when the ultrasound is performed for the mother, the doctor will be very careful, to the eyes The genitals, the spine and other parts will not stay too long.
Lu Hong suggested that in the critical period of 11 weeks of pregnancy + 6 days - 13 weeks + 6 days, 18-24 weeks, to the hospital with some experience to do ultrasound examination, the ordinary two-dimensional B-ultrasound can fully undertake the screening task.
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