根据胎盘绒毛膜、胎盘实质及基底膜不同阶段的影像学特点将胎盘分为四级，作为胎儿成熟度的预测方法。
目的：探讨胎盘成熟度分级与胎肺成熟度之间的联系，以提高对胎儿的监测水平。
Objective: to study the relation between placental mature grading and fetal pulmonary maturity to improve the level monitoring fetus.
目的探讨胎盘成熟度分级与胎盘病理改变的关系，评价胎盘功能，预测分娩结局。
Objective To evaluate the placental function and predict the pregnancy outcome by studying the relation between ultrasound placental mature grading and the pathology changes of the placenta.
探讨孕妇胎盘成熟度分级与胎盘功能之间的联系，以提供更多监测胎盘功能的方法。
To study the relation between placental mature grading and placental function to improve the method of monitoring placental function.
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