1. Articles from Ammar Javaid

    1-2 of 2
    1. Optical rotary junction incorporating a hollow shaft DC motor for high-speed catheter-based optical coherence tomography

      Optical rotary junction incorporating a hollow shaft DC motor for high-speed catheter-based optical coherence tomography

      In intravascular optical coherence tomography (OCT), the optical rotary junction plays an important role in rotating and pulling back the catheter to generate cross-sectional coronary artery images. To meet the requirements of high-speed intravascular OCT in a clinical setting, the rotary junction should generate high torque and low vibration. In this Letter, we demonstrate an ultrahigh speed optical rotary junction incorporating a hollow shaft brushless DC servomotor to remove a pulley belt, or a gear to minimize vibration noise and transfer stable torque. To evaluate the performance of the rotary junction, the vibration noise and variation of rotation were measured ...

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    2. Automated accurate lumen segmentation using L-mode interpolation for three-dimensional intravascular optical coherence tomography

      Automated accurate lumen segmentation using L-mode interpolation for three-dimensional intravascular optical coherence tomography

      Intravascular optical coherence tomography (IVOCT) lumen-based computational flow dynamics (CFD) enables physiologic evaluations such as of the fractional flow reserve (FFR) and wall sheer stress. In this study, we developed an accurate, time-efficient method for extracting lumen contours of the coronary artery. The contours of cross-sectional images containing wide intimal discontinuities due to guide wire shadowing and large bifurcations were delineated by utilizing the natural longitudinal lumen continuity of the arteries. Our algorithm was applied to 5931 pre-intervention OCT images acquired from 40 patients. For a quantitative comparison, the images were also processed through manual segmentation (the reference standard) and ...

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    1-2 of 2
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  2. Topics in the News

    1. (1 articles) Yonsei University
    2. (1 articles) University of Florida
    3. (1 articles) Delft University of Technology
    4. (1 articles) Huikai K. Xie
    5. (1 articles) Eduardo Margallo Balbás
    6. (1 articles) MedLumics
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