频域光学相干层析成像中复共轭模糊抑制的理论分析

C. Seelamantula, R. Michaely, R. Leitgeb, M. Unser
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引用次数: 6

摘要

近年来,人们提出了一种新的移相技术来抑制频域光学相干层析成像中的复共轭模糊。通过在扫描镜处合并一个小的光束偏移,以一种优雅的方式引入了相移。然后使用希尔伯特变换和傅里叶变换的组合来计算层析图。这与传统方法明显不同,传统方法中每个a扫描都是独立重建的。本文在信号处理框架中对该问题进行了表述,并给出了最大和部分抑制复共轭模糊的理论证明。为了补充理论推导,我们提供了人体指甲体内测量的实验结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Theoretical analysis of complex-conjugate-ambiguity suppression in frequency-domain optical-coherence tomography
New phase-shifting techniques have recently been proposed to suppress the complex-conjugate ambiguity in frequency- domain optical-coherence tomography. A phase shift is introduced, in an elegant fashion, by incorporating a small beam offset at the scanning mirror. The tomogram is then computed by using a combination of Hilbert and Fourier transforms. This is a marked deviation from the conventional approaches, wherein each A-scan is reconstructed independently of the others. In this paper, we formulate the problem in a signal processing framework and provide theoretical proofs for maximal and partial suppression of complex-conjugate ambiguity. To supplement the theoretical derivations, we provide experimental results on in vivo measurements of a human finger nail.
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