CAJ | 학술논문

在频域光学相干层析成像（SD-OCT）中，数据通常通过波数域的非均匀采样得到。在进行快速傅里叶变换得到图像之前需要进行一个数据重采样过程。数据重采样会造成额外的计算负担，而且会带来一定的数据误差。采用一种逆成像算法得到 SD-OCT 图像，将 SD-OCT 系统建模为一系列线性方程组，通过求解一个逆问题以实现 SD-OCT 系统的成像。利用全变差（TV）作为限制条件以保留图像的边缘信息，然后由 SD-OCT 测量数据直接估计样本的二维互相关。仿真结果表明，和传统方法相比，该算法所得到的噪声残余量更低。同时还验证了利用 TV 限制条件以抑制 SD-OCT 中对衰落的敏感性的可能性。
재빈역광학상간층석성상（SD-OCT）중，수거통상통과파수역적비균균채양득도。재진행쾌속부리협변환득도도상지전수요진행일개수거중채양과정。수거중채양회조성액외적계산부담，이차회대래일정적수거오차。채용일충역성상산법득도 SD-OCT 도상，장 SD-OCT 계통건모위일계렬선성방정조，통과구해일개역문제이실현 SD-OCT 계통적성상。이용전변차（TV）작위한제조건이보류도상적변연신식，연후유 SD-OCT 측량수거직접고계양본적이유호상관。방진결과표명，화전통방법상비，해산법소득도적조성잔여량경저。동시환험증료이용 TV 한제조건이억제 SD-OCT 중대쇠락적민감성적가능성。
In spectral-domain optical coherence tomography (SD-OCT),the data are usually collected by nonuniform sampling in wave number domain.There has the need of data re-sampling process before the conventional fast Fourier transform being applied to reconstruct an image.Data re-sampling will cause extra computation burden and often introduces certain errors to data.Instead,we develop an inverse imaging approach to reconstruct an SD-OCT image,model the SD-OCT as a series of linear equations,and implement SD-OCT system imaging by finding the solution of the inverse problem.We make use of total variation (TV)as a constraint to preserve image’s edge information,and estimate the two-dimensional cross-correlation of a sample directly from SD-OCT measurements.Simulation results indicate that compared with conventional method,our technique gives a smaller noise residual.The potential of using the TV constraint to suppress the sensitivity falloff in SD-OCT is also demonstrated with experiment data in the paper.