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基于标定臂的低噪声光学相干层析成像技术

Low Noise Optical Coherence Tomography Imaging Technology Based on Demarcating Arm

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摘要

针对光学相干层析(OCT)技术受散斑噪声影响严重的问题,研究了低噪声OCT成像技术。在系统中加入标定臂,利用标定信号对纵向扫描位置进行精确定位,降低检测过程中样品微位移所引入的误差;并在此基础上对各次纵向扫描信号进行曲波(curvelet)变换,采用自适应阈值法滤除图像散斑噪声,最后通过对多次纵向扫描信号的curvelet系数进行权重滤波和均值处理进一步降低散斑噪声。实验结果证明,与未经curvelet滤波的多次纵向扫描平均图像相比,低噪声OCT成像技术可以提高信噪比18.35%。

Abstract

This paper describes a low noise optical coherence tomography (OCT) technology based on curvelet algorithm and a demarcating arm to decrease the speckle noise in OCT. The demarcating arm in the Michelson interferometer makes the precise positioning of A-scans possible and diminishes the displacement error caused by tissue moving. Besides, each A-scan is curvelet transformed and adaptive filtered, the curvelet coefficients are weighted, averaged and reconstructed to reduce speckle noise. Compared with traditional A-scans average method, the application of curvelet algorithm and demarcating arm in low noise OCT provides 18.35% increase in signal to noise ratio.

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中图分类号:R318

DOI:10.3788/cjl201340.1104001

所属栏目:生物医学光子学与激光医学

责任编辑:韩峰  信息反馈

基金项目:国家自然基金青年科学基金(30800245)

收稿日期:2013-05-02

修改稿日期:2013-07-02

网络出版日期:--

作者单位    点击查看

汪毅:天津大学教育部光电信息与技术重点实验室, 天津 300072
陈晓冬:天津大学教育部光电信息与技术重点实验室, 天津 300072
王婷:天津大学教育部光电信息与技术重点实验室, 天津 300072
冷吉:天津大学教育部光电信息与技术重点实验室, 天津 300072
郁道银:天津大学教育部光电信息与技术重点实验室, 天津 300072

联系人作者:汪毅(koala_wy@tju.edu.cn)

备注:汪毅(1981—),女,博士,讲师,主要从事光学相干层析方面的研究。

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引用该论文

Wang Yi,Chen Xiaodong,Wang Ting,Leng Ji,Yu Daoyin. Low Noise Optical Coherence Tomography Imaging Technology Based on Demarcating Arm[J]. Chinese Journal of Lasers, 2013, 40(11): 1104001

汪毅,陈晓冬,王婷,冷吉,郁道银. 基于标定臂的低噪声光学相干层析成像技术[J]. 中国激光, 2013, 40(11): 1104001

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