1. Articles from ZIQIANG WU

    1-8 of 8
    1. Error Correction and Quantitative Subanalysis of Optical Coherence Tomography Data Using Computer-Assisted Grading

      Error Correction and Quantitative Subanalysis of Optical Coherence Tomography Data Using Computer-Assisted Grading

      purpose. To demonstrate feature subanalysis and error correction of optical coherence tomography (OCT) data by using computer-assisted grading. methods. The raw exported StratusOCT (Carl Zeiss Meditec, Inc., Dublin, CA) scan data from 20 eyes of 20 patients were analyzed using custom software (termed OCTOR) designed to allow the user to define manually the retinal borders on each radial line scan. Measurements calculated by the software, including thickness of the nine standard macular subfields, foveal center point (FCP), and macular volume, were compared between two graders and with the automated Stratus analysis. Mean and range of differences for each parameter were ...

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    2. Errors in Retinal Thickness Measurements Obtained by Optical Coherence Tomography

      Errors in Retinal Thickness Measurements Obtained by Optical Coherence Tomography

      Objective To report the frequency and severity of optical coherence tomography (OCT) retinal thickness measurement errors and to describe parameters that predict these errors. Design Observational case series. Participants Two hundred consecutive patients undergoing OCT imaging. Methods One eye (primary) from each of 200 consecutive patients undergoing Stratus OCT imaging (Carl Zeiss Meditec, Dublin, CA) with radial lines or fast macular thickness-based acquisition protocols was selected for review by 2 graders. On each of the line scans, graders evaluated the position of the automated retinal boundary lines (inner retinal surface and retinal pigment epithelium band) used by the OCT machine ...

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    3. Image Quality Affects Macular and Retinal Nerve Fiber Layer Thickness Measurements on Fourier-Domain Optical Coherence Tomography

      Image Quality Affects Macular and Retinal Nerve Fiber Layer Thickness Measurements on Fourier-Domain Optical Coherence Tomography
      BACKGROUND AND OBJECTIVE To investigate whether image quality is an important determinant of retinal nerve fiber layer (RNFL) and macular thickness measurements on Fourier-domain optical coherence tomography (OCT). PATIENTS AND METHODS Seventy-five and 56 normal subjects were recruited in RNFL and macular thickness arms of the study, respectively. Each participant was scanned three times using both the 3D OCT-1000 (version 3.01, Mark II; Topcon Corporation, Tokyo, Japan) and the Cirrus OCT (version 3.0, Model 4000; Carl Zeiss Meditec, Inc., Dublin, CA). The scans for each participant were arranged in order of increasing image qualities, which were correlated with ...
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    4. Comparison of full-thickness traumatic macular holes and idiopathic macular holes by optical coherence tomography

      Comparison of full-thickness traumatic macular holes and idiopathic macular holes by optical coherence tomography
      Background The optical coherence tomography (OCT) and clinical characteristics of traumatic macular holes (TMHs) can be compared to those of idiopathic macular holes (IMHs) to gain insights into the pathogenesis of both. Methods The demographic data and visual acuity of 73 consecutive patients with unilateral, full-thickness TMHs and 182 consecutive patients with idiopathic IMHs were recorded. All patients with TMH and 60 patients with IMH underwent OCT scanning and quantitative measurements. The apical and basal diameters and marginal retinal thicknesses were recorded for each hole. The hole areas and eccentricities were calculated. These parameters were compared between the two types ...
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    5. Macular Thickness Measurements in Normal Eyes With Time-Domain and Fourier-Domain Optical Coherence Tomography

      Purpose: To compare macular thickness measurements using time-domain optical coherence tomography (OCT) and Fourier-domain OCT. Methods: Thirty-two eyes from 32 normal patients underwent complete ophthalmic evaluation. Macular scanning using the StratusOCT and the RTVue-100 OCT were performed for a total of three times each on the same visit. The average retinal thicknesses of the nine macular sectors as defined by the Early Treatment Diabetic Retinopathy Study, along with the foveal center point and macular volume, were recorded. The SD, the coefficient of variation, and the intraclass correlation coefficient were calculated for each parameter studied. Comparisons were made between the two ...
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    6. Signal Strength is an Important Determinant of Accuracy of Nerve Fiber Layer Thickness Measurement by Optical Coherence Tomography.

      Purpose: To investigate the effect of signal strength on the measurement of the retinal nerve fiber layer (RNFL) using optical coherence tomography (OCT). Methods: Eyes with known or suspected glaucoma or nonglaucomatous optic atrophy were scanned twice within the same visit using Stratus OCT's Fast Nerve Fiber Layer Thickness protocol. Only those eyes with 2 high-quality scans (signal strengths of at least 5 and different from each other, no error messages, and no obvious segmentation errors) were included in the study. The RNFL thickness measurements from the initial and the repeat scans were compared and then correlated with the ...
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    7. CLASSIFICATION OF FULL-THICKNESS TRAUMATIC MACULAR HOLES BY OPTICAL COHERENCE TOMOGRAPHY.

      Purpose: To describe morphologic features of traumatic macular holes on optical coherence tomography and to correlate them with clinical findings. Methods: Seventy-three consecutive patients diagnosed with full-thickness traumatic macular holes involving the fovea underwent complete ophthalmic evaluation followed by horizontal and vertical li...
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    1-8 of 8
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