We present a high speed polarization sensitive spectral domain optical coherence tomography system based on polarization maintaining fibers and two high speed CMOS line scan cameras capable of retinal imaging with up to 128 k A-lines/s. This high imaging speed strongly reduces motion artifacts and therefore averaging of several B-scans is possible, which strongly reduces speckle noise and improves image quality. We present several methods for averaging retardation and optic axis orientation, the best one providing a 5 fold noise reduction. Furthermore, a novel scheme of calculating images of degree of polarization uniformity is presented. We quantitatively compare the noise reduction depending on the number of averaged frames and discuss the limits of frame numbers that can usefully be averaged.
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机译:我们提出了一种基于偏振保持光纤的高速偏振敏感光谱域光学相干层析成像系统和两个能够以高达128 k A线/秒的速度进行视网膜成像的高速CMOS线扫描相机。如此高的成像速度极大地减少了运动伪影,因此可以对多个B扫描进行平均,从而大大减少了斑点噪声并提高了图像质量。我们介绍了几种平均延迟和光轴方向的方法,最好的方法是将噪音降低5倍。此外,提出了一种计算偏振均匀度图像的新颖方案。我们根据平均帧数定量地比较降噪,并讨论可以有效平均的帧数限制。
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