Optical modeling of a line-scan optical coherence tomography system for high-speed three-dimensional endoscopic imaging

Kamal, Mohammad Mostafa; Sivakumar, N.R.; Packirisamy, Muthukumaran

doi:10.1117/12.839593

Cited by 5 publications

(9 citation statements)

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“…The initial values for the distance between the optical components are considered as follows: the distance between the fold mirror and the grating is 18 mm, the distance between the grating and the focusing mirror is 15 mm, and the radius of the focusing mirror is 50 mm. After that, Merit functions were used to optimize the angles and distances to minimize the aberration on the image plane [ 26 ].…”

Section: The Optical Design Of the Spectrometer Based On Transmission Gratingmentioning

confidence: 99%

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Design and Optimization of a Linear Wavenumber Spectrometer with Cylindrical Optics for Line Scanning Optical Coherence Tomography

Samadi

Dargahi

Narayanswamy

2021

Sensors

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We report the design of a high-efficiency spectral-domain spectrometer with cylindrical optics for line scanning optical coherence tomography (OCT). The spectral nonlinearity in k space (wavenumber) lowers the depth-dependent signal sensitivity of the spectrometers. For linearizing, in this design, grating and prism have been introduced. For line scanning, a cylindrical mirror is utilized in the scanning part. Line scanning improves the speed of imaging compared to fly-spot scanning. Line scanning OCT requires a spectrometer that utilizes cylindrical optics. In this work, an optical design of a linear wavenumber spectrometer with cylindrical optics is introduced. While there are many works using grating and prism to linearize the K space spectrometer design, there is no work on linearizing the k-space spectrometer with cylindrical optics for line scanning that provides high sensitivity and high-speed imaging without the need for resampling. The design of the spectrometer was achieved through MATLAB and ZEMAX simulations. The spectrometer design is optimized for the broadband light source with a center wavelength of 830 ± 100 nm (8.607 μm−1− 6.756 μm−1 in k-space). The variation in the output angle with respect to the wavenumber can be mentioned as a nonlinearity error. From our design results, it is observed that the nonlinearity error reduced from 147.0115 to 0.0149 Δθ*μm within the wavenumber range considered. The use of the proposed reflective optics for focusing reduces the chromatic aberration and increases image quality (measured by the Strehl ratio (SR)). The complete system will provide clinicians a powerful tool for real-time diagnosis, treatment, and guidance in surgery with high image quality for in-vivo applications.

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Section: The Optical Design Of the Spectrometer Based On Transmission Gratingmentioning

confidence: 99%

“…It makes 3D imaging possible by integrating a single-axis scanner. In our earlier articles [ 9 , 23 , 24 , 25 , 26 ], the optical design of a cylindrical mirror-based scanning system has been reported. A cylindrical mirror is used for focusing, and a flat mirror is used for the scanning part.…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of a Linear Wavenumber Spectrometer with Cylindrical Optics for Line Scanning Optical Coherence Tomography

Samadi

Dargahi

Narayanswamy

2021

Sensors

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“…where λ 0 is the central wavelength of the source, with a full width at half-maximum (FWHM) of Δλ, and n is the refractive index of the sample [14,37]. Figure 4 shows the influence of spectral bandwidth and central wavelength of the source for different target values of the axial resolution.…”

Section: Impact Of Miniaturization On Oct Resolutionmentioning

confidence: 99%

“…As the lateral resolution is independent of the axial resolution, the optical design can be optimized for the best lateral scanning with no effect on the axial resolution. The lateral resolution (or transverse resolution) is determined by the optics of the sample arm [37].…”

Section: Impact Of Miniaturization On Oct Resolutionmentioning

confidence: 99%

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Optical coherence tomography within a single microsystem

Maciel¹,

Rosa²,

Wolffenbuttel³

et al. 2018

J. Phys. D: Appl. Phys.

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Optical coherence tomography (OCT) systems have huge potential for applications beyond the traditional ophthalmology as a general-purpose medical instrument for optical biopsy. The widening of the range of applications is expected to significantly increase production volume and, consequently, puts pressure on unit cost. This trend calls for a flexible and miniaturized system fabricated in a batch process. In this paper, the different OCT configurations are compared for suitability in such an implementation. The required flexibility favors operation in the spectral domain, using a broadband light source in combination with a spectrometer, while the miniaturization and low unit-cost in batch fabrication can be achieved using silicon micro-system technologies. The feasibility of miniaturizing OCT components has already been demonstrated, amongst others a beam splitter using 45° saw dicing of a glass substrate and appropriate thin-film coating the integration of the essential components into a single OCT microsystem remains a challenge. In this paper, the wafer-level fabrication of a Michelson interferometer for a miniaturized OCT system is presented, using an improved 45° saw dicing process, which is suitable for wafer-level co-integration of also the other components of the OCT microsystem.

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An off-axis cylindrical mirror focused line scanning system with high imaging quality for broad spectral band

Kamal¹,

Narayanswamy²,

Packirisamy³

2011

J. Opt.

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An ultra-broad bandwidth light source is utilized in optical coherence tomography (OCT) for an ultra-high axial resolution. A lens focused scanning system is commonly used in the OCT imaging. The effective focal length of the lens varies as a function of the wavelength and hence it focuses a broadband spectrum in different focal planes. This variation eventually reduces the axial resolution of the OCT imaging. These variations become even more significant at a higher transverse resolution. In the present paper, a cylindrical mirror focused line scanning system for high quality imaging is presented. The imaging quality of the developed system was evaluated using optical design software and tested experimentally with 50.8 and 25.4 mm focal length cylindrical mirrors. A broadband light source with a center wavelength of 843 nm and a spectral bandwidth of 53 nm was used. The scanning system meets the Marechal criterion by providing a high Strehl ratio (SR) within the 2 mm target scan range. Moreover, the developed cylindrical mirror focused scanning is robust and insensitive to minor beam path variations, and this was proved experimentally.

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Optical modeling of a line-scan optical coherence tomography system for high-speed three-dimensional endoscopic imaging

Cited by 5 publications

References 0 publications

Design and Optimization of a Linear Wavenumber Spectrometer with Cylindrical Optics for Line Scanning Optical Coherence Tomography

Design and Optimization of a Linear Wavenumber Spectrometer with Cylindrical Optics for Line Scanning Optical Coherence Tomography

Optical coherence tomography within a single microsystem

An off-axis cylindrical mirror focused line scanning system with high imaging quality for broad spectral band

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