Ultrathin single-channel fiberscopes for biomedical imaging.
Ultrathin single-channel fiberscopes for biomedical imaging.
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用于生物医学成像的超薄单通道纤维镜。
DOI：
10.1117/1.jbo.18.1.016013
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发表时间：
2013
影响因子：
3.5
通讯作者：
Gmitro,ArthurF
中科院分区：
文献类型：
--
作者：
Kano,Angelique;Rouse,AndrewR;Gmitro,ArthurF
超薄柔性纤维镜通常具有独立的照明和成像通道，直径范围为0.5至2.5毫米。通过将照明和成像路径组合成单个光纤通道，可以潜在地减小直径。单通道光纤镜必须包含一个系统，以尽量减少菲涅耳反射从空气-玻璃界面在普通照明和检测路径。光纤束近端表面的菲涅耳反射尤其成问题。本文介绍并比较了各种减小光纤束近端表面背景信号的方法。评估了三种技术：(1)抗反射（AR）涂层光纤近端，(2)将交叉偏振片合并到光路中，以及(3)一种称为数值孔径共享的新技术，其中图像数值孔径的一部分用于照明，一部分用于检测。
Ultrathin flexible fiberscopes typically have separate illumination and imaging channels and are available in diameters ranging from 0.5 to 2.5 mm. Diameters can potentially be reduced by combining the illumination and imaging paths into a single fiberoptic channel. Single-channel fiberscopes must incorporate a system to minimize Fresnel reflections from air–glass interfaces within the common illumination and detection path. The Fresnel reflection at the proximal surface of the fiber bundle is particularly problematic. This paper describes and compares methods to reduce the background signal from the proximal surface of the fiber bundle. Three techniques are evaluated: (1) antireflective (AR)-coating the proximal face of the fiber, (2) incorporating crossed polarizers into the light path, and (3) a novel technique called numerical aperture sharing, whereby a portion of the image numerical aperture is devoted to illumination and a portion to detection.