Optimization of galvanometer scanning for optical coherence tomography
Optimization of galvanometer scanning for optical coherence tomography
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DOI：
10.1364/ao.54.005495
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发表时间：
2015-06-10
期刊：
影响因子：
1.9
通讯作者：
Rolland, Jannick P.
中科院分区：
文献类型：
--
作者：
Duma, Virgil-Florin;Tankam, Patrice;Rolland, Jannick P.
我们实验研究的有效占空比的振镜为基础的扫描仪（GS）的扫描过程中的三个主要参数：理论/强加的占空比（输入信号），扫描频率和扫描幅度。锯齿波和三角波输入信号的设备被认为是。GS的振荡元件的机械惯性的影响进行了分析，并讨论了其后果的背景下，光学相干断层扫描（OCT）成像。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，在扫描频率的有用范围内证明了器件的饱和。对大样本的OCT成像的研究也验证了这种饱和，如在高扫描频率下使用三角扫描和双三角扫描时在相邻图像之间获得的间隙/模糊部分所示。对于后一个方面，关于扫描过程的相同参数来评估和实现相邻B扫描之间的必要重叠，并且因此评估和实现样本的对应体积重建之间的必要重叠。因此获得了没有这些伪影的OCT图像。(C)2015美国光学学会
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