Simon N V, Deter R L, Levisky J S, Stefos T, Shearer D M
Department of Obstetrics and Gynecology, York Hospital, Pennsylvania 17405.
J Clin Ultrasound. 1989 May;17(4):245-50. doi: 10.1002/jcu.1870170403.
We studied the influence of the interval between the two scans used before 26 weeks' menstrual age to generate individual fetal growth curve standards utilizing the Rossavik growth model: P = c(t) kappa + s(t) (model specification functions previously reported). Intervals of 3 weeks to 12 weeks were suitable for predicting the growth of the abdominal and head circumferences and femur diaphysis length in individual fetuses. However, large systematic and random errors were found with intervals less than 5 weeks for three-dimensional parameters such as the head and abdominal cubes and estimated fetal weight. In addition, the data suggest that the systematic errors for these latter parameters may increase with intervals of 10 weeks or more. Overall, optimal individual fetal growth curve standards were best generated from two scans before 26 weeks' menstrual age separated by 5 weeks to 9 weeks.
我们利用罗萨维克生长模型研究了孕龄26周前进行的两次扫描之间的间隔对生成个体胎儿生长曲线标准的影响：P = c(t) κ + s(t)（先前报道的模型规范函数）。3周至12周的间隔适用于预测个体胎儿的腹围、头围和股骨干长度的生长。然而，对于三维参数，如头部和腹部容积以及估计胎儿体重，间隔小于5周时会出现较大的系统误差和随机误差。此外，数据表明，对于后述这些参数，系统误差可能会随着间隔10周或更长时间而增加。总体而言，最佳的个体胎儿生长曲线标准最好由孕龄26周前间隔5至9周的两次扫描生成。
