Liu Gangjun, Tan Ou, Gao Simon S, Pechauer Alex D, Lee ByungKun, Lu Chen D, Fujimoto James G, Huang David
Opt Express. 2015 Apr 20;23(8):9824-34. doi: 10.1364/OE.23.009824.
We propose methods to align interferograms affected by trigger jitter to a reference interferogram based on the information (amplitude/phase) at a fixed-pattern noise location to reduce residual fixed-pattern noise and improve the phase stability of swept source optical coherence tomography (SS-OCT) systems. One proposed method achieved this by introducing a wavenumber shift (k-shift) in the interferograms of interest and searching for the k-shift that minimized the fixed-pattern noise amplitude. The other method calculated the relative k-shift using the phase information at the residual fixed-pattern noise location. Repeating this wavenumber alignment procedure for all A-lines of interest produced fixed-pattern noise free and phase stable OCT images. A system incorporating these correction routines was used for human retina OCT and Doppler OCT imaging. The results from the two methods were compared, and it was found that the intensity-based method provided better results.
我们提出了基于固定模式噪声位置处的信息（幅度/相位），将受触发抖动影响的干涉图与参考干涉图对齐的方法，以减少残留的固定模式噪声，并提高扫频源光学相干断层扫描（SS-OCT）系统的相位稳定性。一种提出的方法是通过在感兴趣的干涉图中引入波数偏移（k偏移），并搜索使固定模式噪声幅度最小化的k偏移来实现这一点。另一种方法是使用残留固定模式噪声位置处的相位信息来计算相对k偏移。对所有感兴趣的A线重复此波数对齐过程，可生成无固定模式噪声且相位稳定的OCT图像。一个包含这些校正程序的系统被用于人体视网膜OCT和多普勒OCT成像。比较了两种方法的结果，发现基于强度的方法提供了更好的结果。
