Design optimization and implementation of a miniature optical coherence tomography probe based on a MEMS mirror

Wang, Donglin; Fu, Linlai; Sun, Jingjing; Jia, Hongzhi; Xie, Huikai

doi:10.1117/12.899645

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…An alternative way is adding an antiastigmatism cylindrical lens [24,25]. More mechanically stable methods are to add a refractive index matching medium to fill in the air gap between the optical components and the inner surface of the probe sheath [15], or to use a flat optical window [26].…”

Section: Effect Of the Fep Tubingmentioning

confidence: 99%

Probe alignment and design issues of microelectromechanical system based optical coherence tomography endoscopic imaging

et al. 2013

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Endoscopic optical coherence tomography (OCT) imaging has been demonstrated using microelectromechanical system (MEMS) technology by several research groups. The focus of this work is to study how the OCT imaging performance is affected by the radius of curvature of MEMS mirrors as well as the optical alignment accuracy inside small imaging probes. The goal of this study is to provide guidance for assembly tolerance and design optimization of OCT endoscopic probes. Gaussian beam propagation is used for theoretical analysis which is confirmed by optical simulation and verified experimentally with a time-domain OCT system as well. It has been found that the OCT imaging is very sensitive to the distance from the fiber end to the gradient-index (GRIN) lens, which needs to be controlled within 0.1 mm to achieve working distance (WD) longer than 3.5 mm and lateral resolution around 25 μm. The impact on image quality of the MEMS mirror is negligible if the radius of curvature of the mirror surface is greater than 200 mm. In addition, we studied the astigmatism introduced by cylindrical plastic tubing; the maximum astigmatism ratio is 1.1 when the WD is around 2.5 mm.

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Section: Effect Of the Fep Tubingmentioning

confidence: 99%

Probe alignment and design issues of microelectromechanical system based optical coherence tomography endoscopic imaging

et al. 2013

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“…A glass window is used to allow the light to pass, and the distance between the MEMS mirror center and the glass window is 1.8 mm, resulting in a 2mm working distance out of the optical window. It has been shown that a flat optical window leads to much smaller light spot distortion and significantly reduced astigmatism, compared to a cylindrical tube which inevitably stretches the light spot in the transverse direction of the tube [16]. An example OCT image obtained by using this probe is shown in Fig.…”

Section: Endoscopic Oct Based On 2-axis Scanning Mems Mirrorsmentioning

confidence: 99%

Correction of image distortions in endoscopic optical coherence tomography based on two-axis scanning MEMS mirrors

Wang

Peng²,

Samuelson

et al. 2013

Biomed. Opt. Express

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A two-axis scanning microelectromechanical (MEMS) mirror enables an optical coherence tomography (OCT) system to perform threedimensional endoscopic imaging due to its fast scan speed and small size. However, the radial scan from the MEMS mirror causes various distortions in OCT images, namely spherical, fan-shaped and keystone distortions. In this paper, a new method is proposed to correct all of three distortions presented in OCT systems based on two-axis MEMS scanning mirrors. The spherical distortion is corrected first by directly manipulating the original spectral interferograms in the phase domain, followed by Fourier transform and three-dimensional geometrical transformation for correcting the other two types of distortions. OCT imaging experiments on a paper with square ink printed arrays and a glass tube filled with milk have been used to validate the proposed method. Distortions in OCT images of flat or curved surfaces can all be effectively removed.

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Endoscopic swept-source optical coherence tomography based on a two-axis microelectromechanical system mirror

Wang

et al. 2013

J. Biomed. Opt

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A microelectromechanical system (MEMS) mirror based endoscopic swept-source optical coherence tomography (SS-OCT) system that can perform three-dimensional (3-D) imaging at high speed is reported. The key component enabling 3-D endoscopic imaging is a two-axis MEMS scanning mirror which has a 0.8×0.8 mm2 mirror plate and a 1.6×1.4 mm2 device footprint. The diameter of the endoscopic probe is only 3.5 mm. The imaging rate of the SS-OCT system is 50 frames/s. OCT images of both human suspicious oral leukoplakia tissue and normal buccal mucosa were taken in vivo and compared. The OCT imaging result agrees well with the histopathological analysis.

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Design optimization and implementation of a miniature optical coherence tomography probe based on a MEMS mirror

Cited by 3 publications

References 7 publications

Probe alignment and design issues of microelectromechanical system based optical coherence tomography endoscopic imaging

Probe alignment and design issues of microelectromechanical system based optical coherence tomography endoscopic imaging

Correction of image distortions in endoscopic optical coherence tomography based on two-axis scanning MEMS mirrors

Endoscopic swept-source optical coherence tomography based on a two-axis microelectromechanical system mirror

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