1. Articles from Dawei Li

    1-2 of 2
    1. Ultra-sensitive optical coherence elastography using a high-dynamic-range force loading scheme for cervical rigidity assessment

      Ultra-sensitive optical coherence elastography using a high-dynamic-range force loading scheme for cervical rigidity assessment

      An ultra-sensitive, wide-range force loading scheme is proposed for compression optical coherence elastography (OCE) that allows for the quantitative analysis of cervical tissue elasticity ex vivo . We designed a force loading apparatus featuring a water sink for minuscule incremental loading through a volume-controlled water droplet, from which the Young’s modulus can be calculated by fitting the stress-strain curve. We validated the performance of the proposed OCE system on homogenous agar phantoms, showing the Young’s modulus can be accurately estimated using this scheme. We then measured the Young’s modulus of rodent cervical tissues acquired at different gestational ages ...

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    2. Super‐achromatic Optical Coherence Tomography Capsule for Ultrahigh‐resolution Imaging of Esophagus

      Super‐achromatic Optical Coherence Tomography Capsule for Ultrahigh‐resolution Imaging of Esophagus

      Endoscopic optical coherence tomography (OCT) is a noninvasive technology allowing for imaging of tissue microanatomies of luminal organs in real time. Conventional endoscopic OCT operates at 1,300 nm wavelength region with a sub‐optimal axial resolution limited to 8‐20 μm. In this paper we present the first ultrahigh‐resolution tethered OCT capsule operating at 800 nm and offering about 3‐4 fold improvement of axial resolution (plus enhanced imaging contrast). The capsule uses diffractive optics to manage chromatic aberration over a full ~200 nm spectral bandwidth centering around 830 nm, enabling to achieve super‐achromaticity and an axial ...

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    1-2 of 2
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  2. Topics in the News

    1. (2 articles) Johns Hopkins University
    2. (2 articles) Xingde Li
    3. (2 articles) Topcon Medical Systems
    4. (1 articles) Tohoku University
    5. (1 articles) Duke University
    6. (1 articles) Massachusetts Institute of Technology
    7. (1 articles) Hiroshi Mashimo
    8. (1 articles) James G. Fujimoto
    9. (1 articles) Oscar Carrasco-Zevallos
    10. (1 articles) Joseph A. Izatt
    11. (1 articles) Thorlabs
    12. (1 articles) Topcon 3D OCT-2000
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