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超声断层法的进步,可使多胎妊娠的早期诊断和单胎一样,提高了确诊率。从妊娠5周起即可根据胎囊数来诊断多胎。作者列举了用电子扫描显示出妊娠6周的双胎胎囊并有胎心搏动的胎儿图象. 用本法从妊娠5周末起可见胎心搏动,以后更加明显,但仅根据胎囊数进行妊娠初期的判断时,即使为单胎亦可在最初妊娠绒毛膜未与底蜕膜完全相连时,可能出现假羊水腔的图象,因而常被误认为2个胎囊。而在双羊膜双胎中,有一方消失,其妊娠经过如同单胎,故对其诊断,仅在能描绘2个分离的胎儿图象时才可确诊。在这方面,用电子扫描探查胎心搏动及胎动,特别是在妊娠8～9周以后诊断确诊率明显升高。在实际应用中,子宫过大多胎可疑者从妊娠16～20周开始,适用超声的机会逐渐增
Ultrasound tomography advances can make the early diagnosis of multiple pregnancies and singleton, to improve the diagnosis rate. From 5 weeks of pregnancy can be based on the number of fetal sac to diagnose multiple births. The authors enumerated a fetal image showing fetal heartbeat at 6 weeks of gestation with an electronic scan showing fetal heart beats from the 5th trimester of pregnancy and later became more apparent but only based on the number of fetal cysts Even in the first trimester of pregnancy, even when the first trimester chorion is not fully connected to the basal decidua, even a single fetus may present an image of the pseudohumoral cavity, which is often mistaken for two fetal sacs. In the double amniotic twins, one disappeared, the pregnancy after the same as a single child, so the diagnosis, only to be able to describe two separate fetus when the image can be confirmed. In this regard, the use of electronic scanning to detect fetal heartbeat and fetal movement, especially in pregnancy after 8 to 9 weeks diagnostic diagnosis rate was significantly higher. In practical applications, the uterus too many suspicious fetus from 16 to 20 weeks of gestation, the opportunity for the gradual increase of ultrasound