医用硬性内窥镜畸变的评定基础和方法

建立医用硬性内窥镜畸变的评定基础和方法,用视轴对称的球面Z视场为模型来模拟体腔凹面特征,以建立内窥镜物像共轭的分析基础;运用光学原理并结合ISO9039:1994“光学和光学仪器光学系统质量评价———畸变的测定”的定义原则,并根据理论畸变的临床要求确定畸变定义;采用主光线追迹原理推导不同球面Z形状的畸变换算通式。创立了医用硬性内窥镜以单位相对畸变表述的定义和表达式,并导出变换视场面的畸变换算通用公式和测试方法。本文建立的畸变评定基础和方法适用于医用硬性内窥镜的标准应用。

Evaluation Base and Method of Medical Rigid Endoscope Distortion

To set up the evaluation base and method of medical rigid endoscope distortion, by using optical axis symmetrical spherical Z view field as the model to simulate concave characteristics of body cavity, the analysis base of endoscope object-image conjugation is established. By using optical principle together with the definition principle in ISO 9039:1994 “Optics and optical instruments——Quality evaluation of optical systems——Determination of distortion”, with definition of distortion determined by clinical requirement of theoretical distortion, the distortion conversion formula of different sphere Z shapes is deduced by main ray trace principle. The medical rigid endoscope distortion definition and expression which are expressed as unit relative distortion, and distortion conversion formula and testing method of conversion of view field surface, are all established. The distortion evaluation base and method established are applicable for the medical rigid endoscope standard.