采用频域快速延迟线的光学相干层析系统的研制

Optical coherence tomography by adopting frequency-domain optical delay line

建立了一套单模光纤型光学相干层析(OCT)成像系统。系统采用了不同于国内其他组的新型频域快速扫描延迟线(FD-ODL)和外差平衡接受技术,采取了一系列提高系统信噪比的方法,成功地实现高信噪比(113dB)、高分辨率、大成像深度的层析图像的提取,获得了纵向分辨率9μm、横向分辨率10μm、深度2.88μm的清晰的皮肤OCT图像。该系统比传统的采用时域延迟线的OCT在信噪比上高出了一个量级。

In this paper, we report a developed single-mode fiber-designed Optical Coherence Tomography （OCT） system based on Michelson interferometer. The system adopted a newly optical delay line （frequency-domain optical delay line） and balanced heterodyne reception, achieved high Signal-to-Noise （SNR） （113dB）, high resolution and large image depth, obtained skin＇s OCT image with 9μm axial resolution, 10μm transverse resolution, 2.88mm depth and have an order-of-magnitude improvement in SNR compared with previous OCT adopted time domain optical delay line.