大脑视网膜调制传递函数曲线特性分析  

Characteristic Analysis of Modulation Transfer Function Curve of Retina-Brain System

作　　者：曾碧新[1] 陈式苏[1] 

机构地区：[1]温州医学院物理教研室,温州325000

出　　处：《生物医学工程学杂志》2001年第3期400-402,共3页Journal of Biomedical Engineering

摘　　要：探索视网膜对比敏感传递函数曲线特性 ,寻找表征疾病特征和鉴别诊断各种眼疾的方法。用最小二乘法对 MTF曲线 (对数坐标下 )进行二、三次项拟合 ,求得拟合参数。对正常眼和一些眼疾的 MTF数据进行二、三次项拟合 ,得出回归曲线和反映回归曲线特性的参数。对于对称型 MTF曲线 (对数坐标下 )用 k1 、k2 、k3及偏差表征每一种疾病并鉴别之 ,对于非对称型 MTF(对数坐标下 )曲线增加一个非对称参数 k4。This study was aimed to find some parameters for characterizing the modulation transfer function(MTF) specific to diagnosing eye diseases.Least square regression method was used for MTF curve (at logarithmic axis) fitting with quadratic equation so as or cubic equation to obtain the desired parameters. The data of normal and some eye diseases were fitted by quadratic and cubic equations. Three or four parameters were obtained from the curve fitting. The fitting curves were also expressed with figures along with the original data.For symmetric MTF,parameters k 1, k 2 and k 3 were used to characterize the eye diseases. For asymmetric MTF, an additional parameter k 4 was used to show the different injures of frequency channels.

关 键 词：MTF 拟合曲线 特异性 视网膜 调制传递函数 

分 类 号：R311[医药卫生—基础医学]