B Ultrasound Ultrasonic diagnosis instruments have been appliced widely in clinic recently. It can used in obstetrics and gynaecology.

First, In obstetrics application

Two dimension ultrasound only does cut observation for fetal structure usually, so there are a lot of defects. Three dimension ultrasound can not only do surface reconstruction for fetal surface structure, but also use transparent imaging to do three dimension image and improve prenatal diagnosis rate of fetal abnormalities so that ensure different fetal gestational age normal and pathological form.

Firstly, imaging character of different gestational age fetal organs

Bonilla application three dimension image has done detailed observations for sixty-four pregnancy 5-40 weeks embryos and different stages fetal. They found that it has five weeks pregnant and shows yolk sac. After six weeks, embryo appears and displays the original heart tube clearly; When it is eight weeks and can identify hand, fingers and toes; if it is eleven weeks, we can see mouth fetus; It is twelve weeks, it can identify male genital; When it is thirteen weeks, upper and lower limbs appears..

Secondly, Fetal biology measurement

Estimate pregnant time；

Evaluate fetal growth and diagnostic fetal abnormalities

Thirdly, fetal genitourinary system

It can display ADPKD clearly and renal dysplasia by parallel mobile of three-dimensional ultrasound three plane. Three ultrasound surface imaging can show stereo configuration of fetal genital.

Fourth, Fetal central nervous system

Fifth, Fetal abdominal wall defect

Sixth, Fetal face

Fetal face observation is the important part of pregnancy ultrasound examination. Facial deformity refers to chromosome abnormality. Two dimension only display forehead and eyes, nose, lips and ears and three dimension can observate fetal facial anatomy clearly and relationship.

Seventh, Skeletal development and deformity

Eighth, fetal heart and blood vessels

Dynamic three dimension images of fetal heart can povide some useful information on the side of estimating ventricular volume and dynamics change accuratly, measuring ejection fraction, judging intrauterine fetal heart congenital complicated deformity.

Ninth, Umbilical cord

Second, In gynecological application

Firstly, Uterine disease

Use three dimension ultrasound imging can get echo information of coronary and can parallel mobile and rotate by perpendicular plane and analysis uterine deformity, endometrial polyps, submucous myoma.

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