Estimation and compensation of dispersion for a high-resolution optical coherence tomography system
Estimation and compensation of dispersion for a high-resolution optical coherence tomography system
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DOI：
10.1088/2040-8986/aaa2c0
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发表时间：
2018-02-01
影响因子：
2.1
通讯作者：
Tearney, Guillermo J.
中科院分区：
文献类型：
--
作者：
Singh, Kanwarpal;Sharma, Gargi;Tearney, Guillermo J.
在光学相干层析成像系统中，平衡参考样品臂的色散是获得最高轴向分辨率图像的关键。本文提出了一种用于光学相干层析成像系统色散估计和校正的实验方法。系统色散是通过对称放置在零延迟点周围的两个参考镜的光学相干层析图像来计算的。该方法使用宽带光谱域光学相干层析成像系统进行了测试，补偿了放置在样品臂中的3 mm厚的熔融二氧化硅平板引起的色散。利用该方法实现了色散补偿，将空气中的轴向分辨率从10.6微米提高到1.9微米。结果表明，在高分辨率光学相干层析成像系统中，该技术是消除由于色散失配引起的轴向分辨率下降的一种简单而有效的方法。
Balanced reference-sample arm dispersion is critical in optical coherence tomography systems in order to attain images with the highest axial resolution. Here, an experimental method for the estimation and correction of dispersion in an optical coherence tomography system is presented. The system dispersion was computed from two optical coherence tomography images of the reference mirror that were symmetrically placed around the zero delay point. The method was tested using a broad bandwidth spectral domain optical coherence tomography system, compensating for the dispersion caused by a 3 mm thick fused silica flat placed in the sample arm. Using our method, dispersion compensation was achieved and the axial resolution was improved from 10.6 mu m to 1.9 mu m in air. Results suggest that this technique can be a simple and effective method for eliminating axial resolution degradation due to dispersion mismatch between the sample and reference arm in high-resolution optical coherence tomography systems.