目的探讨早孕筛查超声检查中在正中矢状切面进行胎儿颈项透明层(nuchal translucency NT)测量及鼻骨观察的重要性。方法 50例11-13+6周进行早孕筛查超声检查的单胎,NT小于2.5mm,鼻骨均显示的胎儿作为研究对象。
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Objective To find suitable critical value of fetal nuchal translucency (NT) by ultrasonic testing.
目的通过超声检查寻找合适的胎儿颈项皮肤厚度（NT）临界值。
In 11-13 + 6 weeks, fetal nuchal translucency (nt) thickness has become an important index of down's syndrome of early pregnancy screening.
孕11 - 13 + 6周胎儿颈项透明层(NT)厚度已经成为早孕期筛查唐氏综合征的重要指标。
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