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Optimization of galvanometer scanning for optical coherence tomography

机译：光学相干断层扫描的振镜扫描优化

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We study experimentally the effective duty cycle of galvanometer-based scanners (GSs) with regard to three main parameters of the scanning process: theoretical/imposed duty cycle (of the input signal), scan frequency, and scan amplitude. Sawtooth and triangular input signals for the device are considered. The effects of the mechanical inertia of the oscillatory element of the GS are analyzed and their consequences are discussed in the context of optical coherence tomography (OCT) imaging. When the theoretical duty cycle and the scan amplitude are increased to the limit, the saturation of the device is demonstrated for a useful range of scan frequencies by direct measurement of the position of the galvomirror. Investigations of OCT imaging of large samples also validate this saturation, as examplified by the gaps/blurred portions obtained between neighboring images when using both triangular and sawtooth scanning at high scan frequencies. For this latter aspect, the necessary overlap between neighboring B-scans, and therefore between the corresponding volumetric reconstructions of the sample, are evaluated and implemented with regard to the same parameters of the scanning process. OCT images that are free of these artifacts are thus obtained. (C) 2015 Optical Society of America
机译：我们针对扫描过程的三个主要参数，通过实验研究了基于电流计的扫描仪（GSs）的有效占空比：理论/施加的占空比（输入信号的占空比），扫描频率和扫描幅度。考虑设备的锯齿和三角形输入信号。分析了GS振荡元件的机械惯性的影响，并在光学相干断层扫描（OCT）成像的背景下讨论了其后果。当理论占空比和扫描幅度增加到极限时，通过直接测量振镜的位置，可以在有用的扫描频率范围内显示器件的饱和度。对大样本进行OCT成像的研究也验证了这种饱和度，例如在高扫描频率下同时使用三角扫描和锯齿扫描时，相邻图像之间获得的间隙/模糊部分便证明了这一点。对于后一个方面，关于扫描过程的相同参数，评估并实施相邻的B扫描之间的必要重叠，并因此评估样品的相应体积重建之间的重叠。由此获得没有这些伪像的OCT图像。 （C）2015年美国眼镜学会

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