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

Krishnan, Sunder Ram and Seelamantula, Chandra Sekhar and Bouwens, Arno and Leutenegger, Marcel and Lasser, Theo (2012) Zero-crossing approach to high-resolution reconstruction in frequency-domain optical-coherence tomography. In: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION, 29 (10). pp. 2080-2091.

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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. (c) 2012 Optical Society of America

Item Type:	Journal Article
Publication:	JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
Publisher:	OPTICAL SOC AMER
Additional Information:	Copyright for this article belongs to the OPTICAL SOCIETY of AMERERICA
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	09 Jan 2013 12:28
Last Modified:	09 Jan 2013 12:28
URI:	http://eprints.iisc.ac.in/id/eprint/45260

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