Fetal Medicine Unit, Department of Obstetrics and Gynaecology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong, China.
Ultrasound Obstet Gynecol. 2010 Aug;36(2):136-40. doi: 10.1002/uog.7613.
To determine whether real-time three-dimensional (3D) ultrasound with Live xPlane imaging, which enables the simultaneous display of two real-time high-quality image planes, can assist both operators certified by The Fetal Medicine Foundation (FMF) and non-FMF-certified operators in acquiring a true midsagittal plane in the first trimester.
Eight operators, four of them FMF certified (FMF group) and the other four not (non-FMF group), were asked to acquire a fetal image that they believed to represent the true midsagittal plane using real-time 3D ultrasound with Live xPlane imaging as guidance. Each operator was asked to obtain such an image five times from each of five patients. A total of 200 images from 40 patients were obtained and stored for subsequent analysis. All pregnancies were between 11 + 0 and 13 + 6 weeks of gestation. The angle between the falx cerebri and vertical axis (angle of deviation) was then measured by a single operator. A true midsagittal section was defined as an angle of deviation equal to 0 degrees. The angle of deviation and the time taken to acquire each image were compared between FMF and non-FMF groups.
The median angle of deviation for each operator ranged from 1.2 degrees to 3.4 degrees. There was no significant difference in this angle between those who were FMF certified and those who were not (2.0 degrees vs. 2.2 degrees, P = 0.463). The interquartile range of the angle of deviation was also similar between the FMF- and non-FMF-certified operators. Although the time taken for image acquisition was longer among the non-FMF-certified operators (median, 45.5 s vs. 32.0 s), this difference did not reach statistical significance (P = 0.107).
Live xPlane imaging can provide a tool to assist the acquisition of a true midsagittal plane and to determine how true a 'midsagittal' plane really is.
确定实时三维（3D）超声与 Live xPlane 成像相结合，是否能帮助同时获得两个实时高质量成像平面的操作人员，包括经胎儿医学基金会（FMF）认证的操作人员和未经认证的操作人员，获取妊娠早期的真正正中矢状面。
要求 8 名操作人员（4 名经 FMF 认证的操作人员[FMF 组]和 4 名未经认证的操作人员[非 FMF 组]）使用实时 3D 超声与 Live xPlane 成像作为引导，获取他们认为代表真正正中矢状面的胎儿图像。每位操作人员从每位患者中获得 5 次此类图像。共从 40 名患者中获得 200 张图像并进行后续分析。所有妊娠均在 11+0 至 13+6 孕周之间。然后由一名操作人员测量大脑镰与垂直轴之间的夹角（偏转角）。将偏转角等于 0 度的正中矢状切面定义为真正的正中矢状切面。比较 FMF 组和非 FMF 组之间的偏转角和获取每张图像的时间。
每位操作人员的偏转角中位数范围为 1.2 度至 3.4 度。经认证和未经认证的操作人员之间的偏转角无显著差异（2.0 度比 2.2 度，P=0.463）。偏转角的四分位间距在经认证和未经认证的操作人员之间也相似。虽然非经认证的操作人员获取图像的时间较长（中位数，45.5 秒比 32.0 秒），但这一差异无统计学意义（P=0.107）。
Live xPlane 成像可以提供一种工具，帮助获取真正的正中矢状面，并确定“正中矢状面”的真实程度。
