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在扫频光学相干层析(SS-OCT)仪器中,由于光谱标定信号k-clock与OCT信号之间存在不确定的延时,导致光谱标定结果不准确,成像分辨率降低。延时自动校正算法能够准确地自动校正k-clock信号与OCT信号之间的延时。该算法基于提出的平均峰值法和平均半峰全宽(FWHM)法,对OCT信号进行处理分析,分粗调、微调和精调三步对延时点进行自动查找,根据查找结果完成对延时的校正。延时校正后,通过光谱标定得到波数(k)空间均匀分布的OCT信号,可以实现高分辨率图像的重建。实验结果显示,经过自动延时校正,成像分辨率可提高60%,证实了该算法的有效性。
In the swept-frequency optical coherence tomography (SS-OCT) instrument, the spectral resolution is not accurate due to the indefinite delay between the spectral calibration signal k-clock and the OCT signal, and the imaging resolution is reduced. The automatic delay correction algorithm accurately and automatically corrects the delay between the k-clock signal and the OCT signal. Based on the proposed average peak value method and the average FWHM method, the algorithm analyzes and processes the OCT signal, finds the delay point automatically by three steps: coarse tuning, fine tuning and fine tuning. According to the search result, When the correction. After the delay correction, the OCT signal with uniform wave number (k) space can be obtained through spectral calibration, which can reconstruct the high resolution image. Experimental results show that after automatic delay correction, the imaging resolution can be increased by 60%, which proves the effectiveness of the algorithm.