孕龄与胎儿生长发育情况的了解,是近代产科诊断及处理的基础.据研究胎儿计测与其生长发育或孕龄间有良好相关.灰阶超声能良好显示子宫、胎儿等解剖结构,较精确地计测其大小、面积和体积,故可应用超声生物学计测来观察和评定孕龄与胎儿生长发育.孕龄超声估计方法很多,现简介其常 Pregnancy and fetal growth and development of the understanding of the modern obstetric diagnosis and treatment based on the study of fetal measurement and its growth or gestational age have a good correlation between gray-scale ultrasound can well display the uterus, fetuses and other anatomical structures, more accurate To measure its size, size and volume, it can be applied to the observation and evaluation of ultrasound biological measurement of gestational age and fetal growth and development. There are many gestational age ultrasound estimation methods are now often