中国激光, 2009, 36 (2): 503, 网络出版: 2009-02-23   

20 kHz扫频光学相干层析系统

Development of 20 kHz Swept Source Optical Coherence Tomography System
作者单位
浙江大学现代光学仪器国家重点实验室,浙江 杭州 310027
摘要
研制了扫频光学相干层析技术(SS-OCT)系统。该系统基于快速扫频激光光源,将轴向扫描频率由原来时域光学相干层析技术(OCT)系统的500 Hz提高到20 kHz。采用了基于OCT系统本身的预标定方法,实现了波数空间的线性校正。针对扫频光源光谱的非高斯型分布,对干涉光谱实施了基于窗口函数的光谱整形。对于干涉光谱中的直流项和自相关项,除了采用平衡探测共模抑制外,还运用了减除平均值的软件处理方法。系统纵向分辨率14 μm,横向分辨率12 μm,在空气介质中的成像深度3.9 mm,利用研制的SS-OCT系统,成功实现了手指组织样品的快速OCT成像。
Abstract
The self-developed swept source optical coherence tomography (SS-OCT) system is reported. Based on a high speed scanning laser source, the system realizes high speed A-scan rate of 20 kHz from 500 Hz A-scan rate of time-domain OCT. To realize linear calibration of wave number space, a pre-calibration method based on the SS-OCT system is used. Because of the non-Gaussian spectrum output of the swept source, a method based on window function is used for spectrum reshaping in the spectrum domain. To eliminate the direct current(DC) and auto-correlation term in the interference spectrum, the common-rejection of balanced detection, and a software method of subtract the mean value were used. The axial and lateral resolution of the SS-OCT system achieves 14 μm and 12 μm, respectively. The ranging depth of the SS-OCT achieves 3.9 mm. High speed optical coherence tomography images of finger-pad organism using the SS-OCT system wera obtained.
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吴彤, 丁志华. 20 kHz扫频光学相干层析系统[J]. 中国激光, 2009, 36(2): 503. Wu Tong, Ding Zhihua. Development of 20 kHz Swept Source Optical Coherence Tomography System[J]. Chinese Journal of Lasers, 2009, 36(2): 503.

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