Spectral interferogram prediction in high resolution dual- and multiple-band fourier domain optical coherence tomography

Abstract

Using dual-band in Fourier domain optical coherence tomography (FD−OCT) aims at improving resolution. Previous work showed that direct application of Fourier transform to the spectral interferogram with gap between the two bands leads in many cases to resolution poorer than using a single band. In this work we propose an algorithm to fill in the gap in the spectral interferogram based on the linear prediction technique. The results showed that in dual-band FD−OCT we can get resolution equivalent to a continuous band whose width is the sum of the widths of the two bands and plus the width of the spectral gap. We got improved resolutions from 20.6 μm and 9.9 μm to less than 5 micrpmeter in air. Then we generalized our proposed algorithm to general multiple-band FD−OCT systems.