基于液晶自适应光学的视网膜校正成像系统

郑贤良 Zheng Xian-liang, 刘瑞雪 Liu Rui-xue, 夏明亮 Xia Mingliang, 曹召良 Cao Zhao-liang, 宣. X. Li
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引用次数: 1

摘要

为了实现高分辨率视网膜成像,研究了液晶自适应光学(LC-AO)技术及其在视网膜成像中的应用。解决了LC-AO系统在视网膜成像中存在的极化能量损失、视场限制和通用性等问题。为了避免闭环系统中极化造成的能量损失,引入了开环自适应光学系统。成像系统的视场是通过一个可变膜片的粘附而扩大的。脉冲光源降低了曝光率。照明是偏振光,以提高能源效率。采用试验透镜和无限远动态先进靶标,增加瞳孔稳定性,减少个体差异对人眼的影响。校正后的图像清晰度和对比度明显提高。视场由200 μm增强到500 μm。曝光比降至1 /2 ~ 1 /3。高清晰度图像是从之前的低分辨率样本中获取的。解决了LC-AO系统用于高分辨率视网膜成像的大部分问题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Retinal correction imaging system based on liquid crystal adaptive optics
In order to realize high resolution retinal imaging,the technique of Liquid Crystal Adaptive Optics( LC-AO) and its utilize in retinal imaging is under investigation. Problems are settled in the research such as energy loss by polarization,limitation on field of view( FOV) and universality of LC-AO system in retinal imaging. Open-loop adaptive optics system is introduced to avoid the energy loss by polarization in closed-loop system. View field of imaging system is expanded by adhibition of an alterable diaphragm. Exposure ratio is reduced by a pulsed light source. Illumination is polarized to increase energy efficiency. Trial lens and dynamic,advanced target at infinite are used to increase the stability of pupil and reduce the impact of individual differences on human-eyes. Definition and contrast of images after correction are remarkably increased. FOV is enhanced from 200 μm to 500 μm. Exposure ratio is reduced to 1 /2 ~ 1 /3. High definition images are taken from samples with low resolution before. Most problems of LC-AO system for high resolution retinal imaging are settled.
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