Spectral domain optical coherence tomography with dual-balanced detection

En Bo; Xinyu Liu; Si Chen; Yuemei Luo; Nanshuo Wang; Xianghong Wang; Linbo Liu

doi:10.1117/12.2208436

18 March 2016 Spectral domain optical coherence tomography with dual-balanced detection

En Bo, Xinyu Liu, Si Chen, Yuemei Luo, Nanshuo Wang, Xianghong Wang, Linbo Liu

Proceedings Volume 9700, Design and Quality for Biomedical Technologies IX; 970013 (2016) https://doi.org/10.1117/12.2208436
Event: SPIE BiOS, 2016, San Francisco, California, United States

Abstract

We developed a spectral domain optical coherence tomography (SD-OCT) system employing dual-balanced detection (DBD) for direct current term suppression and SNR enhancement, especially for auto-autocorrelation artifacts reduction. The DBD was achieved by using a beam splitter to building a free-space Michelson interferometer, which generated two interferometric spectra with a phase difference of π. These two phase-opposed spectra were guided to the spectrometer through two single mode fibers of the 8 fiber v-groove array and acquired by ultizing the upper two lines of a three-line CCD camera. We rotated this fiber v-groove array by 1.35 degrees to focus two spectra onto the first and second line of the CCD camera. Two spectra were aligned by optimum spectrum matching algorithm. By subtracting one spectrum from the other, this dual-balanced detection system achieved a direct current term suppression of ~30 dB, SNR enhancement of ~3 dB, and auto-autocorrelation artifacts reduction of ~10 dB experimentally. Finally we respectively validated the feasibility and performance of dual-balanced detection by imaging a glass plate and swine corneal tissue ex vivo. The quality of images obtained using dual-balanced detection was significantly improved with regard to the conventional single-detection (SD) images.

Citation Download Citation

En Bo, Xinyu Liu, Si Chen, Yuemei Luo, Nanshuo Wang, Xianghong Wang, and Linbo Liu "Spectral domain optical coherence tomography with dual-balanced detection", Proc. SPIE 9700, Design and Quality for Biomedical Technologies IX, 970013 (18 March 2016); https://doi.org/10.1117/12.2208436

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