Articles that mention Fred K. Chen -Optical Coherence Tomography News

Fred K. Chen

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1. Mentioned In 23 Articles
2. Carotid Disease and Retinal Optical Coherence Tomography Angiography Parameters in Type 2 Diabetes: The Fremantle Diabetes Study Phase II
  
  Explore Home | Diabetes Care Oct 20 2020 Ophthalmology
  
  OBJECTIVE To use optical coherence tomography angiography (OCTA) to determine whether retinal microvascular parameters are associated with carotid arterial disease in people with type 2 diabetes. RESEARCH DESIGN AND METHODS Participants (community-based) underwent detailed assessments including carotid ultrasonography and OCTA. Ultrasound images were assessed for mean intima-media thickness (IMT) and the presence of stenosis. OCTA image analysis provided measures of vessel density, foveal avascular zone (FAZ) area, blood flow areas ...
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  Mentions: Fred K. Chen
3. Retinal Boundary Segmentation in Stargardt Disease Optical Coherence Tomography Images Using Automated
  
  Explore TVST Journal Oct 17 2020 Ophthalmology
  
  Purpose : To use a deep learning model to develop a fully automated method (fully semantic network and graph search [FS-GS]) of retinal segmentation for optical coherence tomography (OCT) images from patients with Stargardt disease. Methods : Eighty-seven manually segmented (ground truth) OCT volume scan sets (5171 B-scans) from 22 patients with Stargardt disease were used for training, validation and testing of a novel retinal boundary detection approach (FS-GS) that combines a ...
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  Mentions: University of Queensland University of Western Australia Fred K. Chen
4. RTVue XR AngioVue Optical Coherence Tomography Angiography Software Upgrade Impacts on Retinal Thickness and Vessel Density Measurements
  
  Explore TVST Journal Feb 16 2020 Ophthalmology
  
  Purpose : To determine the impact of an AngioVue software upgrade on total retinal thickness (RT) and inner retinal vessel density (VD) measurements derived from optical coherence tomography angiography (OCTA). Methods : Optovue OCTA images (3 3 mm) from 126 individuals (105 healthy eyes and 72 eyes with retinal disease) were acquired before an upgrade of the AngioVue software, which resulted in an inward shift of the outer boundary of the inner ...
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  Mentions: Optovue University of Western Australia Fred K. Chen
5. Assessing the Use of Incorrectly Scaled Optical Coherence Tomography Angiography Images in Peer-Reviewed Studies
  
  Explore The JAMA Network Dec 3 2019 Ophthalmology
  
  Importance Individual differences in axial length affect the lateral magnification of in vivo retinal images and as a result can affect the accuracy of quantitative measurements made from these images. As measurements from optical coherence tomography angiography (OCTA) images are becoming increasingly used in the diagnosis and monitoring of a wide range of diseases, evaluating which studies use correctly scaled images is crucial to their interpretation. Objective To perform a ...
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  Mentions: University of Wisconsin Joseph Carroll Fred K. Chen
6. Clinical validation of the RTVue optical coherence tomography angiography image quality indicators
  
  Explore Wiley Online Library Nov 14 2019 Ophthalmology
  
  Importance All automated image quality indicators for en face optical coherence tomography angiography (OCTA) images require gold standard validation for determining optimal thresholds. Background A manual grading system (gold standard) for OCTA images was validated and compared to two automated image quality indicators: signal strength index (SSI) and scan quality index (SQI) generated by different software versions of the Optovue OCTA device. Design Retrospective cross‐sectional study. Participants 52 eyes ...
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  Mentions: Optovue University of Western Australia Fred K. Chen
7. Automatic choroidal segmentation in OCT images using supervised deep learning methods
  
  Explore Nature Publishing Group Sep 16 2019 Ophthalmology
  
  The analysis of the choroid in the eye is crucial for our understanding of a range of ocular diseases and physiological processes. Optical coherence tomography (OCT) imaging provides the ability to capture highly detailed cross-sectional images of the choroid yet only a very limited number of commercial OCT instruments provide methods for automatic segmentation of choroidal tissue. Manual annotation of the choroidal boundaries is often performed but this is impractical ...
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  Mentions: Heidelberg Engineering University of Queensland University of Western Australia
8. Posterior Choroidal Stroma Reduces Accuracy of Automated Segmentation of Outer Choroidal Boundary in Swept Source Optical Coherence Tomography
  
  Explore IOVS Journal Sep 8 2018 Ophthalmology
  
  Purpose : To determine the influence of choroidal boundary morphology on the accuracy of automated measurements of subfoveal choroidal thickness (SFCT) in swept source optical coherence tomography (SSOCT). Methods : A retrospective image analysis of foveal-centered horizontal line scans from normal and diseased eyes using the Topcon DRI OCT-1 Atlantis SSOCT was conducted. Subfoveal choroid-scleral junction (CSJ) and retina-choroidal junction (RCJ) morphologies were graded by two observers. Automated SFCT (A-SFCT) was compared ...
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  Mentions: Topcon Medical Systems University of Western Australia University of Sydney
9. Axial Length Variation Impacts on Superficial Retinal Vessel Density and Foveal Avascular Zone Area Measurements Using Optical Coherence Tomography Angiography
  
  Explore IOVS Journal Jun 20 2017 Ophthalmology
  
  Purpose : To evaluate the impact of image magnification correction on superficial retinal vessel density (SRVD) and foveal avascular zone area (FAZA) measurements using optical coherence tomography angiography (OCTA). Methods : Participants with healthy retinas were recruited for ocular biometry, refraction, and RTVue XR Avanti OCTA imaging with the 3 3-mm protocol. The foveal and parafoveal SRVD and FAZA were quantified with custom software before and after correction for magnification error using ...
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  Mentions: David D. Sampson University of Western Australia Fred K. Chen
10. Enhanced Visualization of Subtle Outer Retinal Pathology by En Face Optical Coherence Tomography and Correlation with Multi-Modal Imaging
  
  Explore Journals | PLOS Dec 13 2016 Ophthalmology
  
  Purpose To present en face optical coherence tomography (OCT) images generated by graph-search theory algorithm-based custom software and examine correlation with other imaging modalities. Methods En face OCT images derived from high density OCT volumetric scans of 3 healthy subjects and 4 patients using a custom algorithm (graph-search theory) and commercial software (Heidelberg Eye Explorer software (Heidelberg Engineering)) were compared and correlated with near infrared reflectance, fundus autofluorescence, adaptive optics ...
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  Mentions: Heidelberg Engineering University of Western Australia Imagine Eyes
11. Impact of retinal pigment epithelium pathology on spectral-domain optical coherence tomography-derived macular thickness and volume metrics and their intersession repeatability
  
  Explore Wiley Online Library Nov 7 2016 Ophthalmology
  
  Background To determine the impact of retinal pigment epithelium (RPE) pathology on intersession repeatability of retinal thickness and volume metrics derived from Spectralis spectral-domain optical coherence tomography (SD-OCT). Design Prospective cross-sectional single centre study. Participants 56 eyes of 56 subjects were divided into 3 groups: (A) normal RPE band (25 eyes), (B) RPE elevation: macular soft drusen (13 eyes) and (C) RPE attenuation: geographic atrophy or inherited retinal diseases (18 ...
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  Mentions: Praveen J. Patel Fred K. Chen
12. Classification of image artefacts in optical coherence tomography angiography of the choroid in macular diseases
  
  Explore Wiley Online Library Nov 19 2015 Ophthalmology
  
  Background To evaluate and classify image artefacts in optical coherence tomography (OCT) angiography (OCTA) of the choroid in a group of patients with macular diseases. Design Retrospective observational study. Participants 5 patients with age-related macular degeneration, 3 with central serous retinopathy, 1 with polypoidal choroidal vasculopathy and 1 with multiple evanescent white dot syndrome. Methods OCTA and OCT reflectivity (OCTR) maps were reviewed along with their fluorescein angiography and indocyanine ...
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  Mentions: University of Western Australia Fred K. Chen
13. Repeatability of retinal thickness and volume metrics in neovascular age-related macular degeneration using the topcon 3DOCT-1000
  
  Explore Indian Journal of Ophthalmology (IJO) Nov 6 2014 Ophthalmology
  
  Optical coherence tomography (OCT) is a commonly used imaging modality that provides detailed cross-sectional retinal images. This has revolutionised management of neovascular age-related macular degeneration. The need for repeated anti-vascular endothelial growth factor injections has led to therapy being delivered using OCT-guided retreatment strategies with both qualitative OCT features of disease activity (e.g. macular fluid) and changes in retinal thickness as triggers for retreatment The purpose of this study ...
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  Mentions: Topcon Medical Systems Adnan Tufail Praveen J. Patel
14. Novel optical coherence tomography classification of torpedo maculopathy
  
  Explore Wiley Online Library Oct 1 2014 Ophthalmology
  
  Background Torpedo maculopathy is a rare condition with a twofold clinical significance. Firstly, it is a differential of atypical congenital hypertrophy of the retinal pigment epithelium. Secondly, visual field loss has been reported. We demonstrate the spectrum of structural abnormality of torpedo maculopathy as seen on optical coherence tomography, and correlate this with age of presentation, fundus autofluorescence, retinal sensitivity loss and visual field abnormality. Design A retrospective, observational case ...
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  Mentions: University of Western Australia Macquarie University Fred K. Chen
15. Zero delay switch technique in optical coherence tomography for duo enhanced vitreoretinal and choroidoscleral imaging in highly myopic eyes
  
  Explore Wiley Online Library Jan 27 2013 Ophthalmology
  
  Posterior staphyloma is a concave depression of the posterior shell of the eye globe that is frequently observed in highly myopic eyes. As hallmark lesion, it is seen in 90% of patients with high myopia and increases in prevalence with age.1 Highly myopic eyes with posterior staphylomata have a higher probability of visual disturbances; the stretching of the posterior fundus results in various lesions such as chorioretinal atrophy, choroidal ...
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  Mentions: University of Western Australia Fred K. Chen
16. Use of Spectral-Domain Optical Coherence Tomography to Differentiate Acquired Retinoschisis From Retinal Detachment in Difficult Cases
  
  Explore LWW Online Apr 11 2012 Ophthalmology
  
  Purpose: This study presents a series of 10 patients who posed a diagnostic challenge regarding the diagnosis of acquired retinoschisis (RS) or retinal detachment (RD), where spectral-domain optical coherence tomography (OCT) with the Spectralis HRA and OCT device (Heidelberg Engineering, Heidelberg, Germany) was able to help make a correct diagnosis. Methods: Ten patients (five with acquired RS and five with RD) were referred to a vitreoretinal clinic at Moorfields Eye ...
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  Mentions: Heidelberg Engineering Fred K. Chen
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