Department of Obstetrics and Gynaecology, The University of Hong Kong, Queen Mary Hospital, Li Ka Shing Faculty of Medicine, Hong Kong, SAR China. cheong kah
Ultrasound Obstet Gynecol. 2009 Mar;33(3):287-94. doi: 10.1002/uog.6255.
To compare the new XI VOCAL (eXtended Imaging Virtual Organ Computer-aided Analysis) for three-dimensional (3D) ultrasound measurement of fetal volume with the conventional multiplanar technique and a rotational method using VOCAL.
We acquired 3D volume datasets from 30 fetuses at 11-14 weeks of gestation using a commercially available ultrasound system. Fetal volume was calculated using XI VOCAL (with 5, 10, 15 and 20 slices), multiplanar (1-mm interval) and VOCAL (with 12 degrees, 18 degrees and 30 degrees rotation) techniques. The level of agreement for interobserver and intraobserver variability was determined and evaluated for all methods and reliability was assessed.
Fetal volume measurements obtained using XI VOCAL (10 slices) showed good correlation with those obtained using VOCAL (18 degrees) (r = 0.940, P = 0.076; intraclass correlation coefficient (ICC), 0.962 (95% CI, 0.920-0.982), P = 0.182), and XI VOCAL (15 slices) showed good correlation with VOCAL (12 degrees ) (r = 0.961, P = 0.092; ICC, 0.979 (95% CI, 0.957-0.990), P = 0.190). The mean difference between paired measurements by the XI VOCAL (10 slices) and VOCAL (18 degrees ) methods was 1.00 mL, while that by the XI VOCAL (15 slices) and VOCAL (12 degrees) methods was 0.90 mL. 95% limits of agreement were - 2.80 to 4.80 between XI VOCAL (10 slices) and VOCAL (18 degrees) and - 1.90 to 3.70 between XI VOCAL (15 slices) and VOCAL (12 degrees). There was a small difference in the time required to complete the fetal volume measurement between XI VOCAL and VOCAL when a similar number of slices or rotational steps was used (P < 0.05), XI VOCAL taking less time.
XI VOCAL (with 10, 15 and 20 slices) can be used interchangeably with the multiplanar technique (1-mm interval) for the measurement of fetal volume. XI VOCAL (10 slices) and VOCAL (18 degrees) can be used interchangeably, as can XI VOCAL (15 slices) and VOCAL (12 degrees), for the measurement of fetal volume.
比较新的 XI VOCAL（扩展成像虚拟器官计算机辅助分析）用于三维（3D）超声胎儿体积测量与传统多平面技术和使用 VOCAL 的旋转方法。
我们使用商业超声系统从 30 名 11-14 孕周的胎儿中获取 3D 体积数据集。使用 XI VOCAL（5、10、15 和 20 个切片）、多平面（1mm 间隔）和 VOCAL（12 度、18 度和 30 度旋转）技术计算胎儿体积。确定了观察者间和观察者内可变性的一致性水平，并对所有方法进行了评估，评估了可靠性。
XI VOCAL（10 个切片）获得的胎儿体积测量值与 VOCAL（18 度）（r = 0.940，P = 0.076；组内相关系数（ICC），0.962（95%CI，0.920-0.982），P = 0.182），XI VOCAL（15 个切片）与 VOCAL（12 度）（r = 0.961，P = 0.092；ICC，0.979（95%CI，0.957-0.990），P = 0.190）有很好的相关性。XI VOCAL（10 个切片）和 VOCAL（18 度）方法的配对测量之间的平均差异为 1.00mL，而 XI VOCAL（15 个切片）和 VOCAL（12 度）方法的平均差异为 0.90mL。XI VOCAL（10 个切片）和 VOCAL（18 度）之间的 95%一致性界限为-2.80 至 4.80，XI VOCAL（15 个切片）和 VOCAL（12 度）之间的 95%一致性界限为-1.90 至 3.70。当使用相似数量的切片或旋转步骤时，XI VOCAL 和 VOCAL 完成胎儿体积测量所需的时间之间存在微小差异（P <0.05），XI VOCAL 所需时间更少。
XI VOCAL（10、15 和 20 个切片）可与多平面技术（1mm 间隔）互换用于胎儿体积测量。XI VOCAL（10 个切片）和 VOCAL（18 度）可以互换，XI VOCAL（15 个切片）和 VOCAL（12 度）也可以互换，用于胎儿体积测量。
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