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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 29, Iss. 10 — Oct. 1, 2012
  • pp: 2080–2091

Zero-crossing approach to high-resolution reconstruction in frequency-domain optical-coherence tomography

Sunder Ram Krishnan, Chandra Sekhar Seelamantula, Arno Bouwens, Marcel Leutenegger, and Theo Lasser  »View Author Affiliations


JOSA A, Vol. 29, Issue 10, pp. 2080-2091 (2012)
http://dx.doi.org/10.1364/JOSAA.29.002080


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Abstract

We address the problem of high-resolution reconstruction in frequency-domain optical-coherence tomography (FDOCT). The traditional method employed uses the inverse discrete Fourier transform, which is limited in resolution due to the Heisenberg uncertainty principle. We propose a reconstruction technique based on zero-crossing (ZC) interval analysis. The motivation for our approach lies in the observation that, for a multilayered specimen, the backscattered signal may be expressed as a sum of sinusoids, and each sinusoid manifests as a peak in the FDOCT reconstruction. The successive ZC intervals of a sinusoid exhibit high consistency, with the intervals being inversely related to the frequency of the sinusoid. The statistics of the ZC intervals are used for detecting the frequencies present in the input signal. The noise robustness of the proposed technique is improved by using a cosine-modulated filter bank for separating the input into different frequency bands, and the ZC analysis is carried out on each band separately. The design of the filter bank requires the design of a prototype, which we accomplish using a Kaiser window approach. We show that the proposed method gives good results on synthesized and experimental data. The resolution is enhanced, and noise robustness is higher compared with the standard Fourier reconstruction.

© 2012 Optical Society of America

OCIS Codes
(070.4340) Fourier optics and signal processing : Nonlinear optical signal processing
(070.4790) Fourier optics and signal processing : Spectrum analysis
(110.4500) Imaging systems : Optical coherence tomography
(070.2025) Fourier optics and signal processing : Discrete optical signal processing

ToC Category:
Imaging Systems

History
Original Manuscript: April 11, 2012
Manuscript Accepted: July 9, 2012
Published: September 11, 2012

Citation
Sunder Ram Krishnan, Chandra Sekhar Seelamantula, Arno Bouwens, Marcel Leutenegger, and Theo Lasser, "Zero-crossing approach to high-resolution reconstruction in frequency-domain optical-coherence tomography," J. Opt. Soc. Am. A 29, 2080-2091 (2012)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-29-10-2080

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