Scanning system design for large scan depth anterior segment optical coherence tomography.
Scanning system design for large scan depth anterior segment optical coherence tomography.
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DOI：
10.1364/ol.35.001774
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发表时间：
2010-06
期刊：
影响因子：
3.6
通讯作者：
R. Yadav;Kamran Ahmad;G. Yoon
中科院分区：
文献类型：
--
作者：
R. Yadav;Kamran Ahmad;G. Yoon
在远心扫描中，大的横向扫描区域导致四个前眼表面（两个用于角膜，两个用于晶状体透镜）中的每一个上的入射角的增加，从而导致从远离光轴的区域获得的信号的显著减小。我们提出了一种光学相干断层扫描系统，它实现了近垂直入射的横向位置的四个眼睛表面。这提供了散射回系统的光量的增加，从而导致更高的信噪比（SNR）。将该扫描方法和传统远心扫描方法获得的模型眼图像进行了比较。观察到透镜前表面和后表面的SNR分别改善了5dB和12dB。对于角膜后表面，观察到SNR改善4dB，而角膜前表面的SNR改善为0.7dB。
In telecentric scanning a large lateral scan area leads to an increase in the angle of incidence on each of the four anterior ocular surfaces (two for the cornea and two for the crystalline lens), causing significant reduction in the signal obtained from regions farther from the optical axis. We propose an optical coherence tomography scanning system, which achieves nearly normal incidences across the lateral locations of the four ocular surfaces. This provides an increase in the amount of light scattered back to the system, resulting in a higher signal-to-noise ratio (SNR). The images of a model eye obtained with the proposed scan and conventional telecentric scan were compared. SNR improvement of 5dB and 12dB was observed for the anterior and the posterior lens surfaces, respectively. For the posterior corneal surface SNR improvement of 4dB was observed, while the SNR improvement for the anterior corneal surface was 0.7dB.