Is 3D the same as 4D?

Is 3D the same as 4D? Three-dimensional and four-dimensional color Doppler ultrasound is different, general four-dimensional color Doppler ultrasound recommended pregnancy 22 weeks to 26 weeks or so to do, general pregnancy 20 weeks to 26 weeks or so can do four-dimensional color Doppler ultrasound, three-dimensional color Doppler ultrasound generally recommended pregnancy 28 weeks to 32 weeks or so to do, the overall three-dimensional color Doppler ultrasound and four-dimensional color Doppler ultrasound are to check the baby's deformity, four-dimensional color Doppler ultrasound is large row abnormality, three-dimensional color Doppler ultrasound is late system row abnormality, that is, check the baby's heart deformity. Therefore, these two color Doppler ultrasound, pregnant women should do, it is recommended that pregnant women regularly do a good job in each stage of the birth check-up, pregnancy diet as diverse as possible, balanced diet, eat more fresh vegetables and fruits, eat high-quality protein food, eat more crude fiber food.