Linear-wavenumber spectrometer for high-speed spectral-domain optical coherence tomography

Gelikonov, Valentin M.; Gelikonov, Grigory V.; Shilyagin, Pavel A.

doi:10.1134/s0030400x09030242

Cited by 77 publications

(54 citation statements)

References 11 publications

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“…Various approaches have been developed to overcome this issue in the two branches of FD-OCT. These approaches involve hardware modifications: linear-wavenumber spectrometers have been developed [3][4][5] for spectral domain OCT (SD-OCT) and the feasibility of a linearwavenumber swept source has been demonstrated for swept-source OCT (SS-OCT) [6].…”

Section: Introductionmentioning

confidence: 99%

Experimental validation of an optimized signal processing method to handle non-linearity in swept-source optical coherence tomography

Vergnole¹,

Lévesque²,

Lamouche³

2010

Opt. Express

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Section: Introductionmentioning

confidence: 99%

Experimental validation of an optimized signal processing method to handle non-linearity in swept-source optical coherence tomography

Vergnole¹,

Lévesque²,

Lamouche³

2010

Opt. Express

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“…Especially, in the case of figure 6(b) and (d), the noise level was dramatically increased in the PSF when the depth is deeper than 4 mm. In the case of using only sample position shift index, it showed maximum SNR of 55.39 dB in PSF shown in figure (6). And in the case of using both the sample position shift index and intensity compensation array, it showed maximum SNR of 61.08 dB.…”

Section: Experimental Protocolmentioning

confidence: 77%

“…Several attempts have been made to compensate such nonlinearity [5][6][7][8][9][10][11][12]. There are some compensation methods for various OCT systems.…”

Section: Introductionmentioning

confidence: 99%

“…One is a compensation method that inserts the interferometer into the SS-OCT system, receives the linearized interference pattern to the k-domain and uses the pattern as a trigger signal [5]. Another method is that of inserting a prism into the SD-OCT system for compensating nonlinearity [6]. Another method is linearization using software [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simple Spectral Calibration Method and Its Application Using an Index Array for Swept Source Optical Coherence Tomography

Jung¹,

Cho²,

Kim³

et al. 2011

Journal of the Optical Society of Korea

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In this study, we report an effective k-domain linearization method with a pre-calibrated indexed look-up table. The method minimizes k-domain nonlinear characteristics of a swept source optical coherence tomography (SS-OCT) system by using two arrays, a sample position shift index and an intensity compensation array. Two arrays are generated from an interference pattern acquired by connecting a Fabry-Perot interferometer (FPI) and an optical spectrum analyzer (OSA) to the system. At real time imaging, the sample position is modified by location movement and intensity compensation with two arrays for linearity of wavenumber. As a result of evaluating point spread functions (PSFs), the signal to noise ratio (SNR) is increased by 9.7 dB. When applied to infrared (IR) sensing card imaging, the SNR is increased by 1.29 dB and the contrast noise ratio (CNR) value is increased by 1.44. The time required for the linearization and intensity compensation is 30 ms for a multi thread method using a central processing unit (CPU) compared to 0.8 ms for compute unified device architecture (CUDA) processing using a graphics processing unit (GPU). We verified that our linearization method is appropriate for applying real time imaging of SS-OCT.

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“…In this paper, OCT images of a six-layer tape phantom and a human fingernail without a resampling process were successfully demonstrated. Gelikonove et al simulated the spectrum using a BK7 prism and a prism of non-dispersive material at 1300 nm [13,14], and found that the contributions to spectrum linearization came mostly from the geometric factors, i.e. the prism angle and the tilt angle between grating and prism, rather than from the prism material's dispersive properties, when they fixed the pitch of the grating and the detected spectrum range.…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh-Resolution Spectral Domain Optical Coherence Tomography Based on a Linear-Wavenumber Spectrometer

Lee

Kang

Park

et al. 2015

Journal of the Optical Society of Korea

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In this study we demonstrate ultrahigh-resolution spectral domain optical coherence tomography (UHR SD-OCT) with a linear-wavenumber (k) spectrometer, to accelerate signal processing and to display two-dimensional (2-D) images in real time. First, we performed a numerical simulation to find the optimal parameters for the linear-k spectrometer to achieve ultrahigh axial resolution, such as the number of grooves in a grating, the material for a dispersive prism, and the rotational angle between the grating and the dispersive prism. We found that a grating with 1200 grooves and an F2 equilateral prism at a rotational angle of 26.07°, in combination with a lens of focal length 85.1 mm, are suitable for UHR SD-OCT with the imaging depth range (limited by spectrometer resolution) set at 2.0 mm. As guided by the simulation results, we constructed the linear-k spectrometer needed to implement a UHR SD-OCT. The actual imaging depth range was measured to be approximately 2.1 mm, and axial resolution of 3.8 μm in air was achieved, corresponding to 2.8 μm in tissue (n = 1.35). The sensitivity was -91 dB with -10 dB roll-off at 1.5 mm depth. We demonstrated a 128.2 fps acquisition rate for OCT images with 800 lines/frame, by taking advantage of NVIDIA's compute unified device architecture (CUDA) technology, which allowed for real-time signal processing compatible with the speed of the spectrometer's data acquisition.

show abstract

Linear-wavenumber spectrometer for high-speed spectral-domain optical coherence tomography

Cited by 77 publications

References 11 publications

Experimental validation of an optimized signal processing method to handle non-linearity in swept-source optical coherence tomography

Experimental validation of an optimized signal processing method to handle non-linearity in swept-source optical coherence tomography

Simple Spectral Calibration Method and Its Application Using an Index Array for Swept Source Optical Coherence Tomography

Ultrahigh-Resolution Spectral Domain Optical Coherence Tomography Based on a Linear-Wavenumber Spectrometer

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