Sánchez Pérez A, Honrubia López F M, Larrosa Poves J M, Polo Llorens V, Melcon Sánchez-Frieras B
Servicio de Oftalmología, Hospital Miguel Servet, INSALUD, Zaragoza.
Arch Soc Esp Oftalmol. 2001 Sep;76(9):551-8.
To develop a lens planimetry technique for the optic disc using AutoCAD. To determine variability magnitude of the optic disc morphological measurements.
We employed AutoCAD R.14.0 Autodesk: image acquisition, contour delimitation by multiple lines fitting or ellipse adjustment, image sectorialization and measurements quantification (optic disc and excavation, vertical diameters, optic disc area, excavation area, neuroretinal sector area and Beta atrophy area). Intraimage or operator and interimage o total reproducibility was studied by coefficient of variability (CV) (n=10) in normal and myopic optic discs.
This technique allows to obtain optic disc measurement in 5 to 10 minutes time. Total or interimage variability of measurements introduced by one observer presents CV range from 1.18-4.42. Operator or intraimage measurement presents CV range from 0.30-4.21. Optic disc contour delimitation by ellipse adjustment achieved better reproducibility results than multiple lines adjustment in all measurements.
Computer assisted AutoCAD planimetry is an interactive method to analyse the optic disc, feasible to incorporate to clinical practice. Reproducibility results are comparable to other analyzers in quantification optic disc morphology. Ellipse adjustment improves results in optic disc contours delimitation.
利用AutoCAD开发一种用于视盘的晶状体平面测量技术。确定视盘形态测量的变异性大小。
我们使用了AutoCAD R.14.0（欧特克公司）：图像采集、通过多条线拟合或椭圆调整进行轮廓划定、图像扇形划分和测量量化（视盘和凹陷、垂直直径、视盘面积、凹陷面积、神经视网膜扇形面积和β萎缩面积）。通过变异系数（CV）（n = 10）研究正常和近视视盘中的图像内或操作者以及图像间的总重复性。
该技术能够在5到10分钟内获得视盘测量结果。由一名观察者进行的测量的总或图像间变异性的CV范围为1.18 - 4.42。操作者或图像内测量的CV范围为0.30 - 4.21。在所有测量中，通过椭圆调整对视盘轮廓进行划定比通过多条线调整获得了更好的重复性结果。
计算机辅助的AutoCAD平面测量法是一种分析视盘的交互式方法，可纳入临床实践。在对视盘形态进行量化时，重复性结果与其他分析仪相当。椭圆调整改善了视盘轮廓划定的结果。
