In this paper, an angular compounding method to achieve speckle contrast reduction in optical coherence tomography (OCT) imaging is explored in detail. The angular compounding approach involves collecting multiple images at different angles of incidence, registering the images to correct for induced distortions, and then incoherently summing the images to reduce speckle. The method was experimentally demonstrated with a spectrometer-based Master-Slave enhanced OCT instrument capable of directly generating en-face images. We have investigated the impact of the angular range and number of averaged frames on the degree of speckle artefact reduction, as well as the effect on image resolution and sharpness. The minimum angular step necessary to secure a sufficiently small speckle pattern correlation between the images has also been determined, and the method has subsequently been validated on a biological sample (potato cells).

中文翻译：

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使用角度复合的主从光学相干断层扫描直接面对、减少斑点的图像

在本文中，详细探讨了在光学相干断层扫描 (OCT) 成像中实现散斑对比度降低的角度复合方法。角度复合方法包括收集不同入射角的多幅图像，配准图像以校正诱发的失真，然后对图像进行不连贯的求和以减少散斑。该方法通过基于光谱仪的主从增强 OCT 仪器进行实验证明，该仪器能够直接生成正面图像。我们研究了角度范围和平均帧数对散斑伪影减少程度的影响，以及对图像分辨率和锐度的影响。还确定了确保图像之间足够小的散斑图案相关性所需的最小角度步长，