1.2.2 BPD法 采用Philips IU22 超声诊断仪,使用线阵式探头,频率为3.5 MHz,检测胎儿近端颅盖骨外缘到远端颅盖骨内缘之间的距离,即双顶径长,通过腾程孕期胎儿唐氏征产前筛查软件内建公式计算孕妇孕龄,该公式来源于《Ultrasonography in Obstetrics and Gynecology 》1988第2版孕周计算对照表〔3〕。所选对象皆由同一...
means of real-time ultrasound 19829.Hadlock F P;Deter R L;Harrist R B Estimating fetal age:computer-assisted analysis of multiplefetal growth parameters 198410.Selbing A;Kjessler B Conceptual dating by ultrasonic measurement of the fetal biparietal diameterin early pregnancy 198511.Persson P H;...