1. Articles from Qi Zhang

    1-4 of 4
    1. Optical Coherence Tomography Angiography Vessel Density Changes after Acute Intraocular Pressure Elevation

      Optical Coherence Tomography Angiography Vessel Density Changes after Acute Intraocular Pressure Elevation

      To investigate changes in retinal vessel density in optic nerve head (ONH) and macula after acute intraocular pressure (IOP) elevation, we conducted a prospective observational study. Eyes with IOP rise ≥5 mmHg after 2-hour dark room prone provocative test (DRPPT) were included. Vasculature of ONH and macula was examined by optical coherence tomography angiography (OCTA) at baseline and after DRPPT. Among the 65 eyes of 42 individuals, 40 eyes with qualified images were enrolled. Mean IOP rise was 9.6 ± 4.2 mmHg (5.0–23.3 mmHg) after DRPPT. Retinal vessel density did not differ after IOP rise for ...

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    2. Comparison of long-term in-stent vascular response between abluminal groove-filled biodegradable polymer sirolimus-eluting stent and durable polymer everolimus-eluting stent: 3-year OCT follow-up from the TARGET I trial

      Comparison of long-term in-stent vascular response between abluminal groove-filled biodegradable polymer sirolimus-eluting stent and durable polymer everolimus-eluting stent: 3-year OCT follow-up from the TARGET I trial

      The study sought to compare long-term optical coherence tomography (OCT)-based in-stent vascular response between the abluminal groove-filled biodegradable polymer sirolimus-eluting stent (SES) and the durable polymer everolimus-eluting stent (EES) in the TARGET I trial. The TARGET I trial was a prospective, multicenter, randomized clinical trial which enrolled 458 patients with single de novo lesions treated by abluminal groove-filled biodegradable polymer SES and EES. A subset of 43 patients underwent angiography and OCT examinations at 3 years. All OCT images were analyzed at 0.4 mm intervals. A similar increase in angiographic late lumen loss was observed in SES and ...

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    3. Gabor-based anisotropic diffusion for speckle noise reduction in medical ultrasonography

      Gabor-based anisotropic diffusion for speckle noise reduction in medical ultrasonography

      In ultrasound (US), optical coherence tomography, synthetic aperture radar, and other coherent imaging systems, images are corrupted by multiplicative speckle noise that obscures image interpretation. An anisotropic diffusion (AD) method based on the Gabor transform, named Gabor-based anisotropic diffusion (GAD), is presented to suppress speckle in medical ultrasonography. First, an edge detector using the Gabor transform is proposed to capture directionality of tissue edges and discriminate edges from noise. Then the edge detector is embedded into the partial differential equation of AD to guide the diffusion process and iteratively denoise images. To enhance GAD’s adaptability, parameters controlling diffusion are ...

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      Mentions: Fudan University
    4. Repeatability, reproducibility, and agreement of central anterior chamber depth measurements in pseudophakic and phakic eyes: Optical coherence tomography versus ultrasound biomicroscopy

      Repeatability, reproducibility, and agreement of central anterior chamber depth measurements in pseudophakic and phakic eyes: Optical coherence tomography versus ultrasound biomicroscopy
      Purpose: To evaluate the intraexaminer repeatability, interexaminer reproducibility, and agreement of central anterior chamber depth (ACD) measurements obtained by anterior segment optical coherence tomography (AS-OCT) and ultrasound biomicroscopy (UBM) in pseudophakic eyes and phakic eyes.Setting: Eye Hospital, Wenzhou Medical College, Wenzhou, Zhejiang, China.Methods: In this prospective study, the central ACD in right pseudophakic eyes and right phakic eyes was measured with the Visante AS-OCT system and the OTI-Scan HF 35-50 UBM system. Intraexaminer repeatability and interexaminer reproducibility were evaluated in a subgroup of eyes from each group. The repeatability and reproducibility of the measurements were evaluated using intraclass ...
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    1-4 of 4
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  2. Topics in the News

    1. (5 articles) National Institutes of Health
    2. (1 articles) Fudan University
    3. (1 articles) Capital Medical University
    4. (1 articles) Columbia University
    5. (1 articles) Wenzhou Medical College
    6. (1 articles) Jost B. Jonas
    7. (1 articles) Martin B. Leon
    8. (1 articles) Carl Zeiss Meditec
    9. (1 articles) Zeiss Visante OCT
    10. (1 articles) University of Houston
    11. (1 articles) University of Minnesota
    12. (1 articles) Indiana University
    13. (1 articles) Yale University
    14. (1 articles) Massachusetts Institute of Technology
    15. (1 articles) James G. Fujimoto
    16. (1 articles) Taner Akkin
    17. (1 articles) Donald T. Miller
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    Repeatability, reproducibility, and agreement of central anterior chamber depth measurements in pseudophakic and phakic eyes: Optical coherence tomography versus ultrasound biomicroscopy Gabor-based anisotropic diffusion for speckle noise reduction in medical ultrasonography Comparison of long-term in-stent vascular response between abluminal groove-filled biodegradable polymer sirolimus-eluting stent and durable polymer everolimus-eluting stent: 3-year OCT follow-up from the TARGET I trial Optical Coherence Tomography Angiography Vessel Density Changes after Acute Intraocular Pressure Elevation Indiana University Receives NIH Grant for Imaging Spatial and Temporal Dynamics of Retinal Ganglion Cells University of Houston Receives NIH Grant for Structural and Molecular Phenotyping of Embryonic Development Through Multi-Modal Optical Imaging. Massachusetts Institute of Technology Receives NIH Grant for Novel Optical Diagnostics with Optical Coherence Tomography Yale University Receives a NIH Grant for Xenopus As A Model System for Hydrocephaly and Ependymal Ciliogenesis University of Minnesota Receives NIH Grant for Optical Imaging of Neural Activity Based on Lorentz Effect Skin Imaging to Inform Laser Treatments Diabetes and Fundus OCT: 1st Edition (Textbook) Wavelength-encoded multi-channel spectral-domain optical coherence tomography (SD-OCT) for spatiotemporally resolved imaging