1. Articles from Xin Zhou

    1-5 of 5
    1. Detecting human articular cartilage degeneration in its early stage with polarization-sensitive optical coherence tomography

      Detecting human articular cartilage degeneration in its early stage with polarization-sensitive optical coherence tomography

      Detecting articular cartilage (AC) degeneration in its early stage plays a critical role in the diagnosis and treatment of osteoarthritis (OA). Polarization-sensitive optical coherence tomography (PS-OCT) is sensitive to the alteration and disruption of collagen organization that happens during OA progression. This study proposes an effective OA evaluating method based on PS-OCT imaging. A slope-based analysis is applied on the phase retardation images to segment articular cartilage into three zones along the depth direction. The boundaries and birefringence coefficients (BRCs) of each zone are quantified. Two parameters, namely phase homogeneity index (PHI) and zonal distinguishability ( D z), are further developed ...

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    2. Slope-based segmentation of articular cartilage using polarization-sensitive optical coherence tomography phase retardation image

      Slope-based segmentation of articular cartilage using polarization-sensitive optical coherence tomography phase retardation image

      A segmentation method based on phase retardation measurements from polarization-sensitive optical coherence tomography (PS-OCT) is developed to differentiate the structural zones of articular cartilage. The organization of collagen matrix in articular cartilage varies over the different structural zones, generating different tissue birefringence. Analyzing the slope of the accumulated phase retardation at different depths can detect the variation in tissue birefringence and be used to segment the structural zones. The method is validated on phantoms composed of layers of different materials. Articular cartilage samples from adult swine are segmented with the method. The characteristics in each segmented zone are also examined ...

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    3. Correlation between polarization sensitive optical coherence tomography and SHG microscopy in articular cartilage

      Correlation between polarization sensitive optical coherence tomography and SHG microscopy in articular cartilage

      Polarization-sensitive optical coherence tomography (PS-OCT) and second harmonic generation (SHG) microscopy are two imaging modalities with different resolutions, field-of-views (FOV), and contrasts, while they both have the capability of imaging collagen fibers in biological tissues. PS-OCT can measure the tissue birefringence which is induced by highly organized fibers while SHG can image the collagen fiber organization with high resolution. Articular cartilage, with abundant structural collagen fibers, is a suitable sample to study the correlation between PS-OCT and SHG microscopy. Qualitative conjecture has been made that the phase retardation measured by PS-OCT is affected by the relationship between the collagen fiber ...

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    4. Clinical and optic coherence tomography findings of focal choroidal excavation in Chinese patients

      Clinical and optic coherence tomography findings of focal choroidal excavation in Chinese patients

      Background To describe the clinical and optical coherence tomography (OCT) features of focal choroidal excavation in Chinese patients. Methods Retrospectively, thirty-seven eyes (in 31 patients) that demonstrated focal choroidal excavation on spectral-domain OCT were collected. Their clinical characteristics and other features were also collected and analyzed. Results In total, 42 focal choroidal excavations were identified in 31 patients, including 25 unilateral and 6 bilateral (37 eyes). The abnormal changes in these eyes with choroidal excavation were more prominent at the outer part of the neuro-retina, the retinal pigment epithelium (RPE) and the choroid. The average transverse diameter and depth of ...

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    5. Macular Abnormality Observed by Optical Coherence Tomography in Children with Amblyopia Failing to Achieve Normal Visual Acuity After Long-Term Treatment

      Purpose: To investigate why some children with amblyopia fail to achieve normal visual acuity. Methods: Optical coherence tomography (OCT) was performed to observe the morphology of the macular tissue of children with various types of amblyopia who failed to achieve normal visual acuity (< 20/25). Average thickness of the retinal nerve fiber layer (RNFL) of the foveola and fovea (1-mm diameter range) was then assessed by macular retinal tomography map measurement. The data obtained were compared with those considered normal to detect any abnormality. Results: Fifteen patients (24 eyes) were examined. Images showed abnormality with thickened RNFL in the macular ...
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    1-5 of 5
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  2. Topics in the News

    1. (3 articles) University of British Columbia
    2. (2 articles) Simon Fraser University
    3. (2 articles) Myeong Jin Ju
    4. (1 articles) Fudan University
    5. (1 articles) Chunhui Jiang
    6. (1 articles) Carl Zeiss Meditec
    7. (1 articles) Academic Medical Center at the University of Amsterdam
    8. (1 articles) Nankai University
    9. (1 articles) University of Illinois at Urbana-Champaign
    10. (1 articles) The Ohio State University
    11. (1 articles) Daniƫl M. de Bruin
    12. (1 articles) Dirk J. Faber
    13. (1 articles) Ton G. van Leeuwen
    14. (1 articles) Yanmei Liang
    15. (1 articles) Stephen A. Boppart
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    Clinical and optic coherence tomography findings of focal choroidal excavation in Chinese patients Correlation between polarization sensitive optical coherence tomography and SHG microscopy in articular cartilage Slope-based segmentation of articular cartilage using polarization-sensitive optical coherence tomography phase retardation image Detecting human articular cartilage degeneration in its early stage with polarization-sensitive optical coherence tomography High-resolution polarization-sensitive optical coherence tomography for zebrafish muscle imaging Very Late Stent Thrombosis 89 Months after Implantation of Durable Polymer Everolimus-Eluting Stent due to Late Acquired Stent Malapposition and Uncovered Struts Observed by Optical Coherence Tomography, Near-Infrared Spectroscopy and Coronary Angioscopy Optical Coherence Tomography Angiography Analysis of Retinal and Choroidal Vascular Networks during Acute, Relapsing, and Quiescent Stages of Macular Toxoplasma Retinochoroiditis 3D co-registration algorithm for catheter-based optical coherence tomography The feasibility and utility of optical coherence tomography directed histopathology for surgical margin assessment of canine mast cell tumors Woven Coronary Artery Anomaly: Optical Coherence Tomography Versus Intravascular Ultrasound Optical microangiography reveals temporal and depth-resolved hemodynamic change in mouse barrel cortex during whisker stimulation Optical coherence tomography for fast bedside imaging, assessment and monitoring of autoimmune inflammatory skin diseases?