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在谱域光学相干层析成像系统中,宽带光源的群速度色散会降低系统的轴向分辨率,导致成像分辨率和对比度的下降。分析了色散对谱域光学相干层析成像系统轴向分辨率的影响,提出了一种基于光谱校正的轴向分辨率提高方法,通过三步阈值迭代进行光谱坐标的二阶系数拟合,得到校正后的光谱数据并进行深度位置信息解调。以单层薄玻璃片和西红柿表皮组织为测量样品进行了谱域光学相干层析成像实验,结果表明,该方法与现有方法相比,能够有效补偿色散对系统轴向分辨率的影响,可将轴向分辨率有效提高10μm,得到分辨率更高的二维扫描层析图像,该方法对于不同测量样品具有普遍适用性。
In the spectral optical coherence tomography system, the group velocity dispersion of a broadband light source can reduce the axial resolution of the system, resulting in a decrease in the resolution and contrast of the image. The influence of dispersion on the axial resolution of the optical coherence tomography system was analyzed. A new method of axial resolution enhancement based on spectral correction was proposed. The second-order coefficient fitting of spectral coordinates was achieved by three-step threshold iteration, Corrected spectral data and depth position information demodulation. Spectral-domain optical coherence tomography experiments were carried out using single-layer thin glass and tomato epidermis as measured samples. The results show that this method can effectively compensate for the influence of dispersion on the axial resolution of the system compared with the existing methods By effectively increasing the axial resolution by 10μm, a two-dimensional (2D) tomographic image with higher resolution is obtained. This method is universally applicable to different measurement samples.