1. Articles from Donglin Wang

    1-9 of 9
    1. Predictive value of spectral-domain optical coherence tomography features in assessment of visual prognosis in eyes with acute welding arc maculopathy

      Predictive value of spectral-domain optical coherence tomography features in assessment of visual prognosis in eyes with acute welding arc maculopathy

      Objective To observe spectral-domain optical coherence tomography (SD-OCT) features and to determine whether baseline OCT features can be used as predictors of visual acuity outcome in eyes with acute welding arc maculopathy. Methods This retrospective study enrolled twenty-two eyes of eleven subjects with acute welding arc maculopathy. All subjects were evaluated by SD-OCT at baseline and final visit. The involved parameters included best-corrected visual acuity (BCVA), central macular thickness (CMT), the length of ellipsoid zone (EZ) defects, the greatest linear dimension (GLD) of outer retinal lesions, EZ reflectivity and relative EZ reflectivity (defined as the ratio of EZ reflectivity to ...

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    2. Circumferential-scanning endoscopic optical coherence tomography probe based on a circular array of six 2-axis MEMS mirrors

      Circumferential-scanning endoscopic optical coherence tomography probe based on a circular array of six 2-axis MEMS mirrors

      We present a novel circumferential-scan endoscopic optical coherence tomography (OCT) probe by using a circular array of six electrothermal microelectromechanical (MEMS) mirrors and six C-lenses. The MEMS mirrors have a 0.5 mm × 0.5 mm mirror plate and a chip size of 1.5 mm × 1.3 mm. Each MEMS mirror can scan up to 45° at a voltage of less than 12 V. Six of those mirrors have been successfully packaged to a probe head; full circumferential scans have been demonstrated. Furthermore, each scan unit is composed of a MEMS mirror and a C-lens and the six scan ...

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      Mentions: Huikai K. Xie
    3. Common-path optical coherence tomography using a microelectromechanical-system-based endoscopic probe

      Common-path optical coherence tomography using a microelectromechanical-system-based endoscopic probe

      This paper presents a common-path (CP) swept-source optical coherence tomography (SSOCT) system based on a special endoscopic probe design with an in-line internal reflection as the reference and a two-axis electrothermal microelectromechanical system mirror for image scanning. The rear surface of a gradient reflective index (GRIN) lens inside the probe is set as the reference reflection plane. The length of the GRIN lens is optimized to eliminate the artifacts in SSOCT images successfully. Doppler OCT is also demonstrated based on the CP endoscopic probe. The diameter of the probe is only 2.5 mm, so it can be easily inserted ...

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    4. Measuring refractive index and volume of liquid under high pressure with optical coherence tomography and light microscopy

      Measuring refractive index and volume of liquid under high pressure with optical coherence tomography and light microscopy

      Measuring the refractive index and volume of liquid under high pressure simultaneously is a big challenge. This paper proposed an alternative solution by combing optical coherence tomography with microscopy. An experiment for a feasibility study was carried out on polydimethylsiloxane liquid in a diamond anvil cell. The refractive index of the sample increased dramatically with pressure loaded, and the curve of pressure volume was also obtained.

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    5. Swept-source common-path optical coherence tomography with a MEMS endoscopic imaging probe

      Swept-source common-path optical coherence tomography with a MEMS endoscopic imaging probe

      A MEMS-based common-path endoscopic imaging probe for 3D swept-source optical coherence tomography (SSOCT) has been developed. The common path is achieved by setting the reference plane at the rear surface of the GRIN lens inside the probe. MEMS devices have the advantages of low cost, small size and fast speed, which are suitable for miniaturizing endoscopic probes. The aperture size of the two-axis MEMS mirror employed in this endoscopic probe is 1 mm by 1 mm and the footprint of the MEMS chip is 1.55 mm by 1.7 mm. The MEMS mirror achieves large two dimensional optical scan ...

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    6. Feature Of The Week 9/29/13: Utilizing MEMs 2-Axis Mirror Scanners in an Endoscopic OCT Probe

      Feature Of The Week 9/29/13: Utilizing MEMs 2-Axis Mirror Scanners in an Endoscopic OCT Probe

      MEMs scanning technology offers many promising features such as low-cost and small size and seem likely to impact commercial OCT probes in the not too distant future. Recently researchers from the University of Shanghai for Science and Technology, WiO Technology Company, Nanjing Medical University, and University of Florida demonstrated an endoscopic OCT probe based on a 2-axis MEMS mirror. Below is a summary of their recent work. 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 ...

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

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

      A two-axis scanning microelectromechanical (MEMS) mirror enables an optical coherence tomography (OCT) system to perform three-dimensional 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 ...

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

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

      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     mm 2 mirror plate and a 1.6 × 1.4     mm 2 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 ...

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

      Design optimization and implementation of a miniature optical coherence tomography probe based on a MEMS mirror
      Optical coherence tomography (OCT) provides non-invasive cross-sectional imaging capability and high resolution, but it has very limited applications inside human body because of the stringent size requirements for accessing the internal organs. Micro-Electro-Mechanical Systems (MEMS) is an emerging technology that can make devices with small size and fast speed. This paper reports the design optimization of a MEMS mirror-based miniature OCT probe. The probe consists of three main parts: a GRIN lens module (1.3 mm in diameter), a MEMS mirror (1.7 mm x 1.55 mm), and a stainless steel mount. A special assembly holder is designed for ...
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    1-9 of 9
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  2. Topics in the News

    1. (7 articles) Huikai K. Xie
    2. (6 articles) University of Florida
    3. (6 articles) WiO Technology Limited
    4. (2 articles) Boston University
    5. (2 articles) David A. Boas
    6. (1 articles) University of Zurich
    7. (1 articles) Jingjing Sun
    8. (1 articles) Medical University of Vienna
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    Design optimization and implementation of a miniature optical coherence tomography probe based on a MEMS mirror Endoscopic swept-source optical coherence tomography based on a two-axis microelectromechanical system mirror Correction of image distortions in endoscopic optical coherence tomography based on two-axis scanning MEMS mirrors Feature Of The Week 9/29/13: Utilizing MEMs 2-Axis Mirror Scanners in an Endoscopic OCT Probe Swept-source common-path optical coherence tomography with a MEMS endoscopic imaging probe Measuring refractive index and volume of liquid under high pressure with optical coherence tomography and light microscopy Common-path optical coherence tomography using a microelectromechanical-system-based endoscopic probe Circumferential-scanning endoscopic optical coherence tomography probe based on a circular array of six 2-axis MEMS mirrors Predictive value of spectral-domain optical coherence tomography features in assessment of visual prognosis in eyes with acute welding arc maculopathy Comparative study between intravitreal ranibizumab and triamcinolone treatment of diabetic macular edema as regard to optical coherence tomography changes and visual acuity What’s New in Optical Coherence Tomography Angiography for Glaucoma (Book Chapter) Looking into the Future: Optical Coherence Tomography for the Assessment of Cardiac Allograft Vasculopathy