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Proceedings Paper

Enhancement of Fourier domain optical coherence tomography images using discrete Fourier transform method
Author(s): T. H. Chow; S. Gulam Razul; B. K. Ng; Gideon Ho; C. B. A. Yeo
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Paper Abstract

In this paper, we address the problem of spectral data sampling in Fourier domain optical coherence tomography (FD-OCT). The interferometric information in a Fourier Domain OCT system is retrieved from spectral measurements made using a linear array spectrometer. In such spectrometers, spectral data are available as an array of points equally spaced in the wavelength domain. To obtain the spatial profile, the spectral data have to be converted to the frequency domain before applying the Fourier transform. The inverse relationship between these domains causes an unequal spacing of data points after the spectral data is converted to the frequency domain, resulting in the degradation of the FD-OCT images. The current practice typically utilizes zero-padding and spline interpolation to circumvent this problem. While these algorithms do improve the FD-OCT images, our investigations showed that more can be done to enhance the images. Toward this end, we propose a signal processing algorithm based on non-uniform discrete Fourier transform (NUDFT). The results of our algorithm are compared against the current algorithms on both simulated and experimental results.

Paper Details

Date Published: 18 February 2008
PDF: 8 pages
Proc. SPIE 6847, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine XII, 68472T (18 February 2008); doi: 10.1117/12.764279
Show Author Affiliations
T. H. Chow, Nanyang Technological Univ. (Singapore)
S. Gulam Razul, Nanyang Technological Univ. (Singapore)
B. K. Ng, Nanyang Technological Univ. (Singapore)
Gideon Ho, Institute of Bioengineering and Nanotechnology (Singapore)
C. B. A. Yeo, Nanyang Technological Univ. (Singapore)

Published in SPIE Proceedings Vol. 6847:
Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine XII
Joseph A. Izatt; James G. Fujimoto; Valery V. Tuchin, Editor(s)

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