Greenfield D S, Williams R C, Goldhaber P
J Clin Periodontol. 1981 Dec;8(6):474-80. doi: 10.1111/j.1600-051x.1981.tb00896.x.
In the present study, radiographs of a model simulating several degrees of alveolar bone height were taken at different vertical projection angles. Bone height was measured by three examiners utilizing a projection technique similar to that originally employed by Björn et al. (1966, 1969). Correlation coefficients of inter- and intra-examiner readings were found to be statistically significant. The 95% confidence interval of the mean deviation between the observed bone height and the true bone height was less than 5.5%. Further investigations are planned to determine whether this method of quantitating the information on radiographs exposed under various conditions is applicable in clinical practice.
在本研究中，对模拟不同程度牙槽骨高度的模型在不同垂直投影角度下进行了X线片拍摄。三位检查者采用与比约恩等人（1966年、1969年）最初使用的类似投影技术测量骨高度。发现检查者之间和检查者内部读数的相关系数具有统计学意义。观察到的骨高度与真实骨高度之间平均偏差的95%置信区间小于5.5%。计划进一步开展研究，以确定这种量化在各种条件下拍摄的X线片信息的方法是否适用于临床实践。
