Krook P M, Wawrukiewicz A S, Hackethorn J C
Radiology. 1985 Mar;154(3):823-4. doi: 10.1148/radiology.154.3.3881801.
Alterations from the standard conditions under which measurements of fetal femurs are made may alter the estimate of gestational age by up to four weeks. We describe and quantify the errors induced by variations in depth, gain settings, and angle of the femur relative to the US beam. We describe a simple phantom that may be used to help eliminate these sources of possible error.
与测量胎儿股骨时的标准条件存在偏差，可能会使孕周估计值的误差高达四周。我们描述并量化了因深度、增益设置以及股骨相对于超声束的角度变化所导致的误差。我们还描述了一种简单的模型，可用于帮助消除这些可能的误差来源。
