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光学相干层析成像(光学相干层析成像术)的轴向分辨力由光源带宽和探测光束的聚焦条件共同决定。提高光学相干层析成像术轴向分辨力的方法主要基于带宽光源技术。提出了一种将变迹术与光学相干层析成像术相干门有机结合的方法来提高其轴向分辨力。通过适当形式的光瞳滤波器,使光学相干层析成像术系统轴向响应的主瓣宽度缩小到相干门之内,而其旁瓣则处于相干门之外,不对相干成像产生有效贡献。这样,就能在光源带宽不变的条件下,有效提高光学相干层析成像术的轴向分辨力,避免了采用宽带光源所带来的费用昂贵和系统复杂等缺陷。
The axial resolution of optical coherence tomography (optical coherence tomography) is determined by the source bandwidth and the focusing conditions of the probe beam. Methods to improve the axial resolution of optical coherence tomography are mainly based on bandwidth light sources. A method of combining apodization with coherence tomography of optical coherence tomography is proposed to improve its axial resolving power. With the appropriate form of pupil filter, the mainlobe width of the axial response of the optical coherence tomography system is reduced to coherence gates, while its side lobe is outside the coherence gate, making no contribution to coherent imaging. In this way, the axial resolution of the optical coherence tomography can be effectively improved under the condition of the same light source bandwidth, and the defects of high cost and complicated system caused by adopting the broadband light source are avoided.