中文摘要：

目的探索动态正交三平面显示正常胎儿心脏三节段结构的操作方法,为实时三维超声诊断胎儿先天性心脏病奠定基础。方法39例中孕期正常胎儿,利用时空关联成像（STIC）技术,在心尖四腔心切面一次性获得整个心脏的容积数据,其后脱机分析：采用动态正交三平面法,通过调节切割面和正交点位置,在A、B、C3个相互垂直的平面上显示心脏各节段主要结构的灰阶和血流的静态与动态图像。结果在离线状态下,通过胎儿心脏三维图像的调节,能够在动态正交三平面上分别显示胎儿心房、心室和大动脉各节段,其清晰度和信息量可以满足胎儿心脏筛查或胎儿超声心动图分析的需要。结论掌握了动态正交三平面显像的操作方法,可在离线状态下完成正常胎儿心脏节段分析,为超声检查胎儿心脏开辟了一条新途径。

英文摘要：

Objective To establish the basic methods of dynamic multiplanar mode in the Van Praagh （an American patholgist ） segmental analysis of normal fetal heart for the diagnosis of congenital heart diseases. Methods Totally 39 volume datasets of normal fetal heart in the second trimester were acquired entirely by spatiotemporal image correlation （STIC） . Apical four chamber view was located as a starting plane. An off-line analysis of acquired volume datasets was carried out to examine each segment of fetal heart with dynamic multiplanar mode. STIC datasets were displayed interactively as a series of 3 orthogonal planes, and not only could the B-mode and CDFI images of cardiac structures, but also the dynamic loops of one cardiac cycle cauld be performed by navigating the pivot point, rotational axis and shifting each re-slice image plane inside the volume datasets. Results The main features of atria, ventricles, great arteries and the junction segments between them could be viewed with dynamic multiplanar mode by rejusting the three dimensional volume datasets, whose qualities and contents could meet the expectations of off-line segmental analysis of normal fetal hearts. Conclusions Multiplanar mode could be viably applied to off-line segmental analysis of normal fetal hearts in second trimester, which would play a new role in the field of fetal heart examination.