超声生物显微镜对睫状突位置及高度测量重复性研究

目的:为超声生物显微镜(UBM)图像的睫状突位置定量测量设计两个新的指标,并检验新指标与现有的睫状突位置及高度定量测量指标的测量重复性。方法:由同一检查者对21幅经睫状突正中的UBM子午线图像测量新设计的A角,B角以及原有指标TCPD,θ4角,T值这五个指标,观察各指标的观察者内重复性。结果:对21幅图的测量中,A角和T值变异系数均<10％,平均变异系数分别为0.02990和0.02196;TCPD和B角在两幅图中出现变异系数>10％的情况,平均变异数分别为0.04651和0.05146;而θ4角在五幅图中出现变异系数>10％的情况,平均变异系数高达0.06963。结论:原有的睫状突高度测量指标T值及睫状突位置测量指标TCPD具有良好观察者内测量重复性,而θ4角的观察者内测量重复性则较差,新设计的睫状突位置测量指标A角及B角有与TCPD相似的良好观察者内重复性,故认为TCPD,A角,B角及T值是适合临床应用的睫状突位置及高度定量测量指标。眼科学报1999;15:101—106。

Intraobserver Reproducibility Study of Parameters for Measurement of Position and Height of Ciliary Process by Ultrasound Biomicroscopy

Objective: To search for suitable measurement parameters for the study of the position and height of cilliary process by ultrasound biomicroscopy (UBM), to test the in-traobserver measurement reproducibility of the new parameters we designed as well as the old ones.Methods : Five parameters: TCPD, A angle, B angle, 04 angle and T value, are measured in 21 pieces of UBM image by one observer on five separate occasions. The in-traobserver reproducibility is assessed by calculating the coefficient of variation (CV) and the difference among the parameters is tested by grouped T-test. Results: Among 21 images, parameter A angle and T value have no image with CV> 10% , TCPD and B angle have 2 respectively and 64 angle has 5. As to average variation level, A angle is lower than TCPD, 84 angle is higher than TCPD, both differences of which are significant, and B angle and TCPD are about the same level, the difference between them is not significant.Conclusion: Among all the parameters reflecting the position of ciliary process in UBM image, A angle has the best intraobserver reliability, TCPD and B angle are less reliable, 64 angle has the worst reliability. The parameter reflecting the height of ciliary process, T value has very good intraobserver reliability. Eye Science 1999; 15: 103-106.