Shehzad Khalid, Rafique Asifa, Alam Syed Ejaz, Zaidi Shahida
Department of Anatomy, Ziauddin University, Clifton, Karachi.
J Pak Med Assoc. 2007 Jul;57(7):352-5.
To assess the correlation between ultrasonic manual and automatic ellipsoid measurements of foetal head and abdominal circumferences.
This comparative cross-sectional study was conducted at the Ultrasound Clinic, Karachi, from January to July 2004. Seventy two normal pregnant women with gestational ages between 14 to 38 weeks were included. Foetal head and abdominal circumferences were measured by manual method using traditional formulae and by automatic ellipsoid mode incorporated into the real-time ultrasound machines (EcoCee and Power Vision, Toshiba, Japan) using convex probes of 3 and 4.2 MHz frequency. Three readings of each parameter i.e. head circumference (HC) and abdominal circumference (AC) were taken by both methods. Mean values were calculated and compared using paired sample 't' test to assess the correlation between ultrasonic manual and automatic ellipsoid measurements.
The mean HC measured through manual method was found to be 20.11 +/- 7.04 cm and was significantly different from that of 19.46 +/- 6.82 cm measured through ellipsoid automatic technique. There was, however, a perfect positive correlation (r = 0.999) between these measurements. In case of AC, there was no statistical difference between the mean values obtained by the manual technique and those measured automatically (16.79 +/- 6.24 vs. 16.74 +/- 6.11; p < 0.44), correlation between these measurements (r = 0.997) was also significantly positive.
Correlation was found between the mean measurements of the foetal HC and AC by the manual and the automatic method of calculation; and even stronger for the latter. The automatic mode of measurement is a more rapid method than the manual calculation, and its use may be encouraged.
评估胎儿头部和腹围的超声手动测量与自动椭圆测量之间的相关性。
本比较性横断面研究于2004年1月至7月在卡拉奇超声诊所进行。纳入了72例孕周在14至38周之间的正常孕妇。使用传统公式通过手动方法测量胎儿头部和腹围，并使用频率为3和4.2MHz的凸阵探头，通过实时超声仪（日本东芝的EcoCee和Power Vision）中的自动椭圆模式进行测量。两种方法均对每个参数（即头围（HC）和腹围（AC））进行三次测量。计算平均值并使用配对样本“t”检验进行比较，以评估超声手动测量与自动椭圆测量之间的相关性。
通过手动方法测得的平均HC为20.11±7.04cm，与通过椭圆自动技术测得的19.46±6.82cm有显著差异。然而，这些测量之间存在完美的正相关（r = 0.999）。对于AC，手动技术获得的平均值与自动测量的平均值之间无统计学差异（16.79±6.24对16.74±6.11；p < 0.44），这些测量之间的相关性（r = 0.997）也呈显著正相关。
发现胎儿HC和AC的手动计算方法与自动计算方法的平均测量值之间存在相关性；后者的相关性更强。自动测量模式比手动计算更快，可能鼓励使用。
