Measuring crackles.
Measuring crackles.
复制标题
测量裂纹。
作者：
J. Hoevers;R. Loudon
听诊时听到的爆裂声可以用相关波形的时间-幅度图来表示。为了评估可能被考虑用于诊断仪器中的机器实施的几种措施的相对优点，我们比较了基于初始电压偏转的那些的再现性，所述初始电压偏转开始裂纹，所述初始电压偏转基于最大偏转。当两个观察者测量两次相同的爆裂音时，后一组显示出较少的观察者间和观察者内变异性。在这项研究中使用了来自教学磁带的裂纹，分为细和粗。评估了测试的各种措施在个体基础上区分细裂纹和粗裂纹的能力，发现有利于基于最大挠度的措施。他们显示出平均9.96%的错误分类的裂纹，而19.53%的两个措施的基础上的初始偏转。
Crackles heard on auscultation can be represented graphically as a time-amplitude plot of the associated waveform. To assess the relative merits of several measures which might be considered for machine implementation in diagnostic instruments, we compared the reproducibility of those based on the initial voltage deflection which begins a crackle with those based on the largest deflection. The latter group showed less interobserver and less intraobserver variability when the same crackles were measured twice by each of two observers. Crackles from a teaching tape, categorized as fine and coarse, were used in this study. The ability of the various measures tested to distinguish between fine and coarse crackles on an individual basis was assessed and found to favor the measures based on the largest deflection. They showed an average of 9.96 percent incorrectly classified crackles, as opposed to 19.53 percent for the two measures based on the initial deflection.