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由5～7.5兆赫经阴道超声换能器产生的高分辨率影象能在屏幕上显示放大的小胎儿结构而不丧失清晰度。现对早妊和中妊早期胎儿结构如胎儿轮廓、长骨、手指、脸、腭、足、趾和四个心腔,经阴道高频扫描确定其一贯显象的妊龄进行评估。对妊龄9～14周的97例低危妊妇,查出各不同结构的显象妊龄为:胎儿矢状轮廓在9～10周,长骨10～11周,手指12周,脸和腭12周,足和趾13周,四个心腔在14周。探测胚胎和胎儿影象的最终目的是检查各种畸形,发育障碍或疾病。早期妊娠经阴道超声详细检查胎儿的时间选择很重要,合理的方法是所研究的器官和组织在同妊龄的全部胎儿都能成像时才能作详尽的研究。本文提供了在上述妊周内或其后寻找特定畸形及在13周后进行更全面评估畸形的可能性。
High-resolution images of 5 to 7.5 MHz transvaginal ultrasound transducers display an enlarged small fetus structure on the screen without loss of sharpness. Now early pregnancy and early pregnancy early fetal structure such as fetal contours, long bones, fingers, face, palate, foot, toe and four heart chambers, determined by the vaginal high-frequency scanning its consistent imaging of pregnancy-related assessment. 97 pregnant women with gestational age of 9 to 14 weeks of low risk pregnant women, found that the different gestational imaging gestational age: fetal sagittal contour in 9 to 10 weeks, long bone 10 to 11 weeks, fingers 12 weeks, face and palate 12 weeks, foot and toe 13 weeks, four cardiac chambers at 14 weeks. The ultimate goal of detecting embryonic and fetal images is to examine various deformities, developmental disorders or diseases. Early pregnancy transvaginal sonography detailed examination of fetal timing is very important, it is reasonable that the study of organs and tissues in the same gestational age all the fetus can be imaged for a detailed study. This article provides the possibility of finding a specific deformity within or after the above gestational week and for a more complete assessment of the deformity after 13 weeks.