眼后节光学相干断层扫描仪轴向分辨率的检测装置研制和测量不确定度分析

Development of Axial Resolution Testing Device for Optical Coherence Tomograph for the Posterior Segment of the Human Eye and Measurement Uncertainty Analysis

通过分析眼后节光学相干断层扫描仪的轴向分辨率理论计算模型,设计并研制了一套用于测量其轴向分辨率的检测装置。针对一台商业化的眼后节光学相干断层扫描仪,理论计算其轴向分辨率为5.07μm,实际测量值为5.45μm。对检测装置进行不确定度评定,结果为(5.45±0.10)μm,检测装置所引入的测量误差很小;同时,利用该检测装置测得的轴向分辨率满足设备的指标要求(≤6μm)。

Based on the analysis of the theoretical calculation model of axial resolution of optical coherence tomograph for the posterior segment of the human eye, a set of testing device for measuring its axial resolution is designed and developed. In view of a commercial ophthalmic optical coherence tomograph in clinical use, its axial resolution is calculated to be 5.07 μm theoretically, and the actual measurement value is 5.45 μm. The uncertainty of the detection device is evaluated and the result is(5.45±0.10) μm. The measurement error introduced by the testing device is very small. Meanwhile, the axial resolution measured by the testing device meets the requirements of the instrument(≤6 μm).