In-focus line field Fourier-domain optical coherence tomography by complex numerical method

摘要

A numerical deconvolution method that cancels the blurring due to lateral defocus in line field Fourier domain optical coherence tomography (LF-FDOCT) using imaging optics is proposed. This method employs an inverse filter designed from the point spread function (PSF) that is calculated by Fresnel diffraction. The inverse filter can eliminate the lateral defocus, and consequently, the out-of-focus lateral resolution can be improved to a level comparable with the in-focus resolution over the entire axial measurement range. In this paper, we describe the process of calculating the PSF and the inverse filter designed from it in LF-FDOCT. The effect of deconvolution is also schematically discussed and estimated. A knife-edge method also verifies the effect of in-focus resolution experimentally.