Opt Lett. 2021 Jul 15;46(14):3392-3395. doi: 10.1364/OL.428538.
We present an automated method for measuring the lineal density of red blood cells (RBCs) in human retinal capillaries using adaptive optics near-confocal ophthalmoscopy (AONCO). The spatiotemporal traces of RBCs flowing in retinal capillaries were extracted from AONCO images, enhanced using the Gabor filter, the vesselness filter, and the Hough transform. A total of 43 capillary segments (each 50 µm long) were analyzed in 12 eyes of 12 subjects, and the measurement error of the automated method was 0.09 cell over 50 µm compared with results obtained by manual counting. Our method provides a tool for assessing RBC spatial distribution in retinal capillaries.
我们提出了一种使用自适应光学近共焦检眼镜(AONCO)测量人视网膜毛细血管内红细胞(RBC)线密度的自动化方法。从 AONCO 图像中提取了在视网膜毛细血管中流动的 RBC 的时空轨迹,使用 Gabor 滤波器、血管滤波器和 Hough 变换进行增强。对 12 名受试者的 12 只眼中的 43 个毛细血管段(每个 50 µm 长)进行了分析,与手动计数相比,自动化方法的测量误差为 0.09 个细胞/50 µm。我们的方法为评估视网膜毛细血管内 RBC 的空间分布提供了一种工具。