二维超声和三维超声容积对比成像C-平面对胎儿胼胝体的研究

Two-Dimensional and Three-Dimensional Volume Contrast Imagingin C-Plane for the Visualization of Fetal Corpus Callosum

目的比较二维超声和三维超声容积对比成像C-平面(VCI-C)在显示胎儿胼胝体中的应用。资料与方法选取正常65例孕19～40周胎儿,分别经二维超声和三维超声VCI-C平面获取胎儿头颅正中矢状面,通过观察和测量胼胝体的长度,对两种方法进行比较,并进行相关分析。结果通过二维超声和三维超声VCI-C取得胎儿头颅正中矢状面测量胼胝体长度的胎儿分别为53例(81.53)和65例(100)(χ2=10.892,P=0.001)。均能用两种方法测量胼胝体长度的胎儿共53例,平均胼胝体长度分别为35.14±5.66mm、35.15±5.92mm;差异无统计学意义(P>0.05),相关系数为0.986(P<0.001)。结论胼胝体的二维超声图像质量优于VCI-C平面。三维超声比二维超声更易获得胎儿头颅正中矢状面,两种方法分别测量胼胝体长度,差异无统计学意义。但是当二维超声不能获得该切面时,三维超声VCI是一种有效、简单的补充手段。

Purpose To compare the application of sonographic visualization of fetal corpus callosum obtained by two-dimensional（2D） and three-dimensional（3D） volume contrast imaging in thec-plane（VCI-C）.Materials and Methods Sagittal planes of the fetal head in 65 normal fetuses between 19 and 40 weeks of gestation were obtained by 2D and 3D VCI-C sonographyrespectively.Planes obtained using these two methods were compared qualitatively and quantitatively by visualizing and measuring the length of fetal corpus callosum.The correlation was also analyzed.Results The average gestational age of 65 fetuses was 28.26 ±5.17 weeks.In sagittal plane obtained using 2D and 3D VCI-C,fetal corpus callosum could be visualized and measured in 53 cases（81.53） and 65 cases（100） respectively（χ2 = 10.892,P = 0.001）.The number of fetuses whose length of the corpus callosum could be measured by both methods was 53 with average lengths of 35.14±5.66 mm and 35.15±5.92 mm respectively（P 〉 0.05）,and correlation coefficient was 0.986（P 〈 0.001）.Conclusion Image quality of the corpus callosum in 2D ultrasound is higher than 3D VCI-C.3D sagittal planes of the fetal head are easier to obtain.There is no statistical difference between measurements of the length of fetal corpus callosum using both methods.But 3D VCI-C is an effective and simple supplementary means when sagittal planes can’t be obtained by 2D.