Fibre imaging bundles for full-field optical coherence tomography
Fibre imaging bundles for full-field optical coherence tomography
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DOI：
10.1088/0957-0233/18/9/027
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发表时间：
2007-09-01
影响因子：
2.4
通讯作者：
Tatam, R. P.
中科院分区：
文献类型：
--
作者：
Ford, H. D.;Tatam, R. P.
将成像光纤束并入全视场成像光学相干断层扫描系统中，目的是消除内窥镜系统中探针尖端处当前所需的机械扫描。成像束内的每个光纤寻址在束端和样品之间形成的斐索干涉仪，该配置确保探针光纤的引线不敏感性，防止由于数千个组成光纤中的偏振变化而引起的灵敏度变化。该技术允许以使用数字CCD相机检测的2D图像的形式，利用单次测量来获取跨平面区域的信息。深度扫描组件现在被限制在完全无源内窥镜探头外部的处理干涉仪内。该技术已在我们的实验室测试样品进行了评估，并使用基于束的系统获得的图像。数据显示为正面扫描，平行于样品表面，或通过样品的深度切片，空间分辨率约为30 μ m。目前可测的最小反射率估计约为10（-3），这对许多无机样品来说是令人满意的。讨论了提高低反射率样品成像信噪比的方法.
An imaging fibre bundle is incorporated into a full- field imaging optical coherence tomography system, with the aim of eliminating the mechanical scanning currently required at the probe tip in endoscopic systems. Each fibre within the imaging bundle addresses a Fizeau interferometer formed between the bundle end and the sample, a configuration which ensures down- lead insensitivity of the probe fibres, preventing variations in sensitivity due to polarization changes in the many thousand constituent fibres. The technique allows acquisition of information across a planar region with single- shot measurement, in the form of a 2D image detected using a digital CCD camera. Depth scanning components are now confined within a processing interferometer external to the completely passive endoscopic probe. The technique has been evaluated in our laboratory for test samples, and images acquired using the bundle- based system are presented. Data are displayed either as en- face scans, parallel to the sample surface, or as slices through the depth of the sample, with a spatial resolution of about 30 mu m. The minimum detectable reflectivity at present is estimated to be about 10(-3), which is satisfactory for many inorganic samples. Methods of improving the signal- to- noise ratio for imaging of lower reflectivity samples are discussed.