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Estimation of longitudinal resolution in optical coherence imaging

机译：光学相干成像中的纵向分辨率估计

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摘要

The spectral shape of a source is of prime importance in optical coherence imaging because it determines several aspects of image quality, especially longitudinal resolution. Wide spectral bandwidth, which provides short coherence length, is sought to obtain high-resolution imaging. To estimate longitudinal resolution, the spectral shape of a source is usually assumed to be Gaussian, although the spectra of real sources are typically non-Gaussian. We discuss the limit of this assumption regarding the estimation of longitudinal resolution. To this end, we also investigate how coherence length is related to longitudinal resolution through the evaluation of different definitions of the coherence length. To demonstrate our purpose, the coherence length for several theoretical and real spectral shapes of sources having the same spectral bandwidth and central wavelength is computed. The reliability of coherence length computations toward the estimation of longitudinal resolution is discussed.
机译：源的光谱形状在光学相干成像中至关重要，因为它决定了图像质量的多个方面，尤其是纵向分辨率。寻求提供短相干长度的宽光谱带宽以获得高分辨率成像。为了估计纵向分辨率，通常将光源的光谱形状假定为高斯，尽管实际光源的光谱通常是非高斯的。我们讨论有关纵向分辨率估计的这一假设的局限性。为此，我们还通过评估相干长度的不同定义来研究相干长度与纵向分辨率之间的关系。为了证明我们的目的，计算了具有相同光谱带宽和中心波长的光源的几种理论和实际光谱形状的相干长度。讨论了相干长度计算对纵向分辨率估计的可靠性。

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