BACKGROUND: In OCT system, the chromatic dispersion of sample
decreases the resolution and increases the depth misplacement. The developed
numerical dispersion compensation techniques usually do not consider the
higher order dispersion and time-consuming.
OBJECTIVE: We proposed a numerical compensation technique for
correcting depth error and resolution deterioration in Fourier domain
optical coherence tomography (FD-OCT).
METHODS: Firstly, the rough depth of each scatter in multilayer
sample is estimated through magnification curve. Then the depth of a scatter
is iterated to minimum the residual of this scatter in the time domain. At
last, the spectrum of the scatter is reconstructed and dispersion can be
compensated with the tracked depth.
RESULTS: The results show that the depth error is corrected to less
than resolution level and the resolution is corrected to nearly ideal.
CONCLUSIONS: The technique proposed can provide precise sample
tomography, thus enhancing the understanding of sample character.
