Beranek I, Moore R, Kim S, Formanek A, Amplatz K
Radiology. 1976 Sep;120(3):553-6. doi: 10.1148/120.3.553.
Single plane right anterior oblinque ventriculography was performed on 25 patients with normal left ventricular contraction and on 25 with left ventricular akinesia or dyskinesia. The value of the left ventricular ejection fraction (EF) was calculated by 9 different methods, including a new one utilizing the mathematical model of a cone. All methods tested were appropriate for inter-group comparisons of EF. For inter-individual comparisons, however, only those methods described by Davila, Chapman, Dodge, Beranek, and our new method, are appropriate.
对25例左心室收缩正常的患者和25例左心室运动不能或运动障碍的患者进行了单平面右前斜位心室造影。通过9种不同方法计算左心室射血分数（EF）值，包括一种利用圆锥数学模型的新方法。所测试的所有方法都适用于EF的组间比较。然而，对于个体间比较，只有达维拉、查普曼、道奇、贝雷克描述的方法以及我们的新方法是合适的。
