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  • Title: Experimental validation of an optimized signal processing method to handle non-linearity in swept-source optical coherence tomography.
    Author: Vergnole S, Lévesque D, Lamouche G.
    Journal: Opt Express; 2010 May 10; 18(10):10446-61. PubMed ID: 20588899.
    Abstract:
    We evaluate various signal processing methods to handle the non-linearity in wavenumber space exhibited by most laser sources for swept-source optical coherence tomography. The following methods are compared for the same set of experimental data: non-uniform discrete Fourier transforms with Vandermonde matrix or with Lomb periodogram, resampling with linear interpolation or spline interpolation prior to fast-Fourier transform (FFT), and resampling with convolution prior to FFT. By selecting an optimized Kaiser-Bessel window to perform the convolution, we show that convolution followed by FFT is the most efficient method. It allows small fractional oversampling factor between 1 and 2, thus a minimal computational time, while retaining an excellent image quality.
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