How many weeks can pregnant women do four-dimensional color Doppler ultrasound?

1, 20 ~ 24 weeks of pregnancy is the best time to take four-dimensional color Doppler ultrasound, because the fetal 24 weeks is a period of rapid brain development, and the structure of the fetus has been formed during this period, the fetal size and amniotic fluid are moderate, and the activity space in the uterus is large, the influence of fetal bone echo is relatively small, and the image is relatively clear.

2. Color Doppler ultrasound is simply high-definition black-and-white B ultrasound plus color Doppler. Let's talk about ultrasonic frequency shift diagnosis, that is, D-mode ultrasound. This method applies the principle of Doppler effect. When there is relative motion between the sound source and the receiver (that is, the probe and the reflector), the frequency of the echo changes, which is called frequency shift. Two-dimensional ultrasound includes pulsed Doppler, continuous Doppler and color Doppler blood flow images. At present, the development direction of B-ultrasound in the medical field is color ultrasound.

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