光学相干层析成像随深度变化的色散补偿方法  

Depth-Dependent Dispersion Compensation for Optical Coherence Tomography

作　　者：潘柳华[1,2] 李中梁[1,2] 王向朝[1,2] 张向阳[3] 南楠[1] 陈艳[1,2] 王瑄[1,2] 卢宇[1,2] 

机构地区：[1]中国科学院上海光学精密机械研究所信息光学与光电技术实验室,上海201800 [2]中国科学院大学,北京100049 [3]江南大学理学院,江苏无锡214122

出　　处：《光学学报》2017年第5期102-109,共8页Acta Optica Sinica

基　　金：上海市科学技术委员会创新行动计划(15441905600);广西高校光电信息处理重点实验室开放基金资助项目(KFJJ2016-04)

摘　　要：提出一种随深度变化的色散补偿方法,用以提升频域光学相干层析成像系统的纵向分辨率。该方法利用迭代算法计算出不同成像深度处的色散补偿系数,通过数值计算,得到色散补偿系数与成像深度的关系表达式,计算出各成像深度处的色散补偿系数,利用这些色散补偿系数消除相应深度位置处信号的高阶色散相位,从而有针对性地对系统中参考臂与样品臂的色散失配进行补偿,消除色散的展宽效应。理论推导和实验结果表明,光学相干层析成像系统中,随深度变化的色散补偿方法对各成像深度位置处的信号,包括成像深度较深位置处的弱信号,均可以进行有效的色散补偿,进而得到更多的样品结构信息。A depth-dependent dispersion compensation method is presented to enhance the axial resolution in Fourier-domain optical coherence tomography. The dispersion compensation coefficients at different depths are calculated by an iterative algorithm, and a mathematical expression between the dispersion compensation coefficient and depth is obtained through numerical calculation. From the mathematical expression, the dispersion compensation coefficients at different depths are calculated to eliminate the high-order dispersion phase at different depths. The dispersion mismatch between the reference arm and sample arm is compensated and the broadening effect of dispersion is avoided. Theoretical derivation and experimental results in the optical coherence tomography systems show that the dispersion at different depths, including the deeper positions which have weaker signals, is effectively compensated by the depth-dependent dispersion compensation method and thus more structure informations of the sample are obtained.

关 键 词：成像系统 医用光学 光学相干层析成像 图像处理 色散补偿 

分 类 号：TN247[电子电信—物理电子学]