提出了一种基于波长编码的扫频光学相干层析(SS-OCT)内窥成像方法,详细分析了该方法的工作原理,从理论分析上证明了其可行性。从系统时间脉冲响应和传递函数推导出系统干涉信号的数学表达式;模拟了简单样品的干涉信号,并给出Morlet小波分析的解码结果;讨论了系统的一些关键性能参数,如横向成像点数、成像分辨率、成像范围、成像速度等,指出系统横向分辨率和纵向分辨率相互制约,提高扫频光源的扫频范围是优化系统分辨率的有效方法。

A scheme for swept-source optical coherence tomography (SS-OCT) based on wavelength-encoded endoscopic imaging is presented and demonstrated in theory. The main principles involved in the imaging scheme are analyzed in detail. The mathematical analysis of the interference signal pattern in terms of ‘temporal impulse response’ and ‘spectral response’ is conducted. The simulated interferograms of simple samples and the decode results by Morlet wavelet are presented. The system key parameters such as transverse imaging resolvable points,imaging ranges,resolutions are detailed discussed. It is found that the transverse resolution and depth resolution are affected by each other,and an effective method to improve the system resolutions is to enlarge the swept range of the swept source.