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20 February 2006 Enhancement of lateral resolution of Fourier domain optical coherence tomography over diffraction-limit by defocus-detection and numerical compensation
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Abstract
A method of lateral superresolution for Fourier domain optical coherence tomography is presented. This method consists of intentional defocus and its numerical compensation using a spatial frequency- phase filter. The designing process of the phase filter is described, and the superresolution effect is discussed theoretically. Experimental results of a knife-edge test prove that the frequency filter enhances the lateral resolution better than a diffraction-limited resolution. This method is applied to the investigation of an in vivo human iris and shows the effect of the cancellation of defocus.
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Yoshiaki Yasuno, Jun-ichiro Sugisaka, Yusuke Sando, Yoshifumi Nakamura, Shuichi Makita, Takashi Endo, Masahide Itoh, and Toyohiko Yatagai "Enhancement of lateral resolution of Fourier domain optical coherence tomography over diffraction-limit by defocus-detection and numerical compensation", Proc. SPIE 6079, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine X, 607918 (20 February 2006); https://doi.org/10.1117/12.648344
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