Non-uniform non-harmonic analysis method development and verification of applicability to swept source optical coherence tomography

Tetsuya Uchida; Shigeki Hirobayashi; Tadanobu Misawa; Toshio Yoshizawa; Xu Cao; Changho Chong; Atsushi Morosawa; Koki Totsuka; Takuya Suzuki

doi:10.1587/nolta.4.172

Special issue on Advances and Applications in Nonlinear Time Series Methods

Non-uniform non-harmonic analysis method development and verification of applicability to swept source optical coherence tomography

Tetsuya Uchida, Shigeki Hirobayashi, Tadanobu Misawa, Toshio Yoshizawa, Xu Cao, Changho Chong, Atsushi Morosawa, Koki Totsuka, Takuya Suzuki

Author information

Tetsuya Uchida
Graduate School of Science and Engineering for Education, University of Toyama
Shigeki Hirobayashi
Department of Intellectual Information Systems Engineering Faculty of Technology, University of Toyama
Tadanobu Misawa
Department of Intellectual Information Systems Engineering Faculty of Technology, University of Toyama
Toshio Yoshizawa
Department of Intellectual Information Systems Engineering Faculty of Technology, University of Toyama
Xu Cao
SANTEC Corporation
Changho Chong
SANTEC Corporation
Atsushi Morosawa
SANTEC Corporation
Koki Totsuka
SANTEC Corporation
Takuya Suzuki
SANTEC Corporation

Keywords: optical coherence tomography, swept-sorce OCT, signal processing, non-harmonic analysis

JOURNAL FREE ACCESS

2013 Volume 4 Issue 2 Pages 172-182

DOI https://doi.org/10.1587/nolta.4.172

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Abstract

We generally analyze data measured at equal time intervals using fast Fourier transforms (FFTs). However, when for some reason we can only obtain unequally spaced measurement points, then the data become non-uniform and cannot be analyzed directly using FFTs. In this paper, the non-uniform trapezoidal integral discrete Fourier transform (TINUDFT) is proposed to replace the FFT, and is implemented in non-harmonic analysis (NHA) to develop non-uniform NHA (NUNHA) for non-uniform data. NUNHA improved the SNR by over 70 dB compared with the simple non-uniform sinusoidal signal frequency. NUNHA's effectiveness for swept source optical coherence tomography (SS-OCT) is shown by simulation.

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