Yang Xiao Hong, Chen Min, Leung Tak Yeung, Wong Sau Mei, Lau Tze Kin
Fetal Medicine Unit, Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China.
J Matern Fetal Neonatal Med. 2011 Feb;24(2):297-300. doi: 10.3109/14767058.2010.487139. Epub 2010 May 26.
To study the angle of the deviation of a presumed midsagittal plane of the fetal spine from the true midsagittal planes by three-dimensional (3D) ultrasound and to investigate whether the experience of operators has an effect on the degree of this deviation.
Eight sonographers, four were trained to perform routine anomaly scan (Trained Group) and four were trained to perform fetal biometric measurement only (Non-trained Group), were asked to use a 3D transducer to obtain a 2D image which they thought to represent the true midsagittal plane of the fetal spine. A 3D volume was then acquired. Stored volumes were analyzed using the multiplanar mode. In the transverse plane, the angle of the deviation of presumed midsagittal planes from the true midsagittal planes was measured.
The mean angle of deviation of the trained group was significantly lower than that of the non-trained group (7.9 vs. 21.1, p < 0.001). There were no significant variations among the four operators within each group. However, even among the Trained Group, the angle of deviation could be as large as 27.2°.
Training improved the ability to obtain a midsagittal plane of the fetal spine. 3D ultrasound might provide potential useful information to guide the acquisition of standard image planes.
通过三维超声研究胎儿脊柱假定矢状中平面与真正矢状中平面的偏差角度，并调查操作者的经验是否会对这种偏差程度产生影响。
八名超声检查人员，四名接受过常规异常扫描培训（培训组），四名仅接受过胎儿生物测量培训（未培训组），被要求使用三维探头获取他们认为代表胎儿脊柱真正矢状中平面的二维图像。然后采集三维容积数据。使用多平面模式分析存储的容积数据。在横断面上，测量假定矢状中平面与真正矢状中平面的偏差角度。
培训组的平均偏差角度显著低于未培训组（7.9对21.1，p<0.001）。每组内的四名操作者之间无显著差异。然而，即使在培训组中，偏差角度也可能高达27.2°。
培训提高了获取胎儿脊柱矢状中平面的能力。三维超声可能为指导获取标准图像平面提供潜在有用信息。
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