All Articles from Mincheol Seong -Optical Coherence Tomography News

Articles from Mincheol Seong

1-20 of 20
1. Retinal Changes before and after Silicone Oil Removal in Eyes with Rhegmatogenous Retinal Detachment Using Swept-Source Optical Coherence Tomography
  
  Explore MDPI Open Access Journals Platform Nov 21 2021 Ophthalmology
  
  This study aimed to evaluate and compare the retinal and choroidal thickness and vessel density (VD) changes between silicone oil (SO) tamponade and after SO removal using swept-source optical coherence tomography (SS-OCT) and OCT angiography (OCTA). Thirty patients who underwent pars plana vitrectomy for retinal detachment (RD) with SO tamponade were included. SS-OCT and OCTA were conducted before RD surgery, during SO tamponade, and after SO removal. A 3-dimensional volumetric wide scan protocol was used for the analysis. The segmented retina, choroidal thickness map, and peripapillary thickness were then measured. For the OCTA analysis, 4.5 × 4.5 mm scans ...
  Read Full Article
  
  Comment
  
  Mentions: Hanyang University
2. Combined wide-field optical coherence tomography angiography density map for high myopic glaucoma detection
  
  Explore Nature Publishing Group Nov 15 2021 Ophthalmology
  
  The present study aimed to evaluate the diagnostic ability of wide-field optical coherence tomography angiography (OCTA) density map for detection of glaucomatous damage in high myopic (HM) eyes and to further compare the diagnostic ability of OCTA with that of conventional imaging approaches including red-free photography and swept-source OCT (SS-OCT) wide-field maps. A total of 77 healthy HM eyes and 72 HM eyes with open angle glaucoma (OAG) participated in this retrospective observational study. Patients underwent a comprehensive ocular examination, including wide-field SS-OCT scan and peripapillary area and macular OCTA scans. An integrated OCTA density map thereafter was merged by ...
  Read Full Article
  
  Comment
  
  Mentions: Hanyang University
3. Wide-field optical coherence tomography deviation map for early glaucoma detection
  
  Explore BJO Online Jul 25 2021 Ophthalmology
  
  Background/aims: This study aimed to establish a wide-field optical coherence tomography (OCT) deviation map obtained from swept-source OCT (SS-OCT) scans. Moreover, it also aimed to compare the diagnostic ability of this wide-field deviation map with that of the peripapillary and macular deviation maps currently being used for the detection of early glaucoma (EG). Methods: Four hundred eyes, including 200 healthy eyes and 200 eyes with EG were enrolled in this retrospective observational study. Patients underwent a comprehensive ocular examination, including wide-field SS-OCT (DRI-OCT Triton; Topcon, Tokyo, Japan). The individual wide-field scan was converted into a uniform template using the ...
  Read Full Article
  
  Comment
  
  Mentions: Topcon Medical Systems Hanyang University
4. Deep Learning-based Diagnosis of Glaucoma Using Wide-field Optical Coherence Tomography Images
  
  Explore LWW Online May 15 2021 Ophthalmology
  
  Purpose: (1) To evaluate the performance of a deep learning (DL) classifier in detecting glaucoma, based on wide-field swept-source optical coherence tomography (SS-OCT) images. (2) To assess the performance of DL-based fusion methods in diagnosing glaucoma using a variety of wide-field SS-OCT images and compare their diagnostic abilities with that of conventional parameter-based methods. Methods: Overall, 675 eyes, including 258 healthy eyes and 417 eyes with glaucoma were enrolled in this retrospective observational study. Each single-page wide-field report (12×9 mm) of wide-field SS-OCT imaging provides different types of images that reflect the state of the eyes. A DL-based automated ...
  Read Full Article
  
  Comment
  
  Mentions: Hanyang University
5. A Wide-Field Optical Coherence Tomography Normative Database Considering the Fovea-Disc Relationship for Glaucoma Detection
  
  Explore TVST Journal Feb 15 2021 Ophthalmology
  
  Purpose : One purpose of this study was to collect wide-field swept-source optical coherence tomography (SS-OCT) data from healthy eyes and build a wide-filed normative database. Another purpose was to compare the glaucoma diagnostic ability of new parameters based on this normative database to the parameters that are currently in use, such as the peripapillary retinal nerve fiber layer (RNFL), macular ganglion cell-inner plexiform layer, and ganglion cell complex (GCC) thickness. Methods : This study had 220 healthy eyes and 292 eyes with early-stage glaucoma (EG) and moderate-stage glaucoma (MG) enrolled. Using the wide-field SS-OCT images (12 × 9 mm) of healthy eyes ...
  Read Full Article
  
  Comment
  
  Mentions: Hanyang University
6. Effect of Hemodialysis on Peripapillary Choroidal Thickness Measured by Swept-Source Optical Coherence Tomography
  
  Explore LWW Online Dec 22 2020 Ophthalmology
  
  Purpose: To investigate the effects of hemodialysis (HD) on peripapillary choroidal thickness (PCT) by swept-source optical coherence tomography (SS-OCT) and on other ophthalmologic parameters in patients with end-stage kidney disease (ESKD). Methods: This was a prospective observational study. We evaluated 29 patients who underwent HD for ESKD. Detailed ophthalmologic examinations and SS-OCT were performed immediately before and after HD. PCT was measured using the modification tool in the built-in OCT image viewer program. Changes in PCT before and after HD were statistically analyzed. Results: The average PCT significantly decreased from 127.3±49.2▒μm before HD to 117.1 ...
  Read Full Article
  
  Comment
  
  Mentions: Hanyang University
7. Vulnerability Zone of Glaucoma Progression in Combined Wide-field Optical Coherence Tomography Event-based Progression Analysis
  
  Explore IOVS Journal May 28 2020 Ophthalmology
  
  Purpose : To investigate the spatial characteristics and patterns of structural progression using the combined retinal nerve fiber layer (RNFL) and ganglion cell–inner plexiform layer event-based progression analysis feature provided by the Guided Progression Analysis (GPA) software of spectral-domain optical coherence tomography. Methods : In this retrospective observational study, we evaluated 89 patients with open-angle glaucoma showing clinically confirmed structural progression within a minimum follow-up period of 3 years. For each eye, the RNFL and ganglion cell–inner plexiform layer GPA data were extracted from serial spectral-domain optical coherence tomography (HD-OCT 4000, Carl Zeiss Meditec, Inc., Dublin, CA) data from 2012 ...
  Read Full Article
  
  Comment
  
  Mentions: Seoul National University Carl Zeiss Meditec
8. Changes in the Retinal Microvasculature Measured Using Optical Coherence Tomography Angiography According to Age
  
  Explore MDPI Open Access Journals Platform Mar 28 2020 Ophthalmology
  
  In this cross-sectional study, we examined age-related changes in the retinal vessels of 100 healthy participants, aged from 5 to 80 years, and divided into four groups (G1, under 20 years of age; G2, from 20 to 39 years of age; G3, from 40 to 59 years of age; G4, age 60 years or older). All subjects underwent swept-source optical coherence tomography (SS-OCT) and OCT angiography (OCTA). The vascular density (VD) of the superficial (SCP) and deep capillary plexus (DCP), and choriocapillaris (CCP) were measured using OCTA. The vascular density of each capillary layer, foveal avascular zone (FAZ) area, ganglion ...
  Read Full Article
  
  Comment
  
  Mentions: Hanyang University
9. Effect of Hemodialysis on Anterior Chamber Angle Measured by Anterior Segment Optical Coherence Tomography
  
  Explore Hindawi Publishing Corporation Aug 20 2019 Ophthalmology
  
  Purpose . To investigate the effect of hemodialysis (HD) on the anterior chamber angle by anterior segment optical coherence tomography (ASOCT) and other ophthalmologic parameters in patients with end-stage kidney disease (ESKD). Methods . A prospective observational study was performed on 20 patients who underwent HD for ESKD. Anterior chamber angle images were obtained by 16 mm line scan of ASOCT. The angle opening distance (AOD) and the trabecular-iris space area (TISA) were determined using the ImageJ program. Additional 12 mm horizontal and 9 mm vertical wide-field scans centered on the posterior pole were performed for the measurement of peripapillary retinal nerve ...
  Read Full Article
  
  Comment
  
  Mentions: Hanyang University
10. Comparison of repeatability of swept-source and spectral-domain optical coherence tomography for measuring inner retinal thickness in retinal disease
  
  Explore Journals | PLOS Jan 17 2019 Ophthalmology
  
  Purpose To compare repeatability between SS-OCT and SD-OCT for measurement of macular, macular retinal nerve fiber (mRNFL), and ganglion cell-inner plexiform layer (GC-IPL) thickness in various retinal diseases. Methods One hundred and fourteen eyes of 114 subjects were investigated. Seventy-eight eyes with retinal disease and 36 normal eyes underwent two consecutive measurements of macular, mRNFL, and GC-IPL thickness using SS-OCT and SD-OCT. The data were obtained using the Early Treatment Diabetic Retinopathy Study (ETDRS) protocol. The eyes with retinal diseases were divided into three subgroups according to central macular thickness (CMT) for analysis. The intraclass correlation coefficient (ICC) was calculated ...
  Read Full Article
  
  Comment
  
  Mentions: Hanyang University
11. Optical coherence tomography angiography analysis of changes in the retina and the choroid after haemodialysis
  
  Explore Nature Publishing Group Nov 24 2018 Ophthalmology
  
  The purpose of this study is to evaluate the effect of haemodialysis on perfused vessel density, choroidal thickness (CT), and retinal thickness in end-stage renal disease (ESRD) using swept-source optical coherence tomography angiography (SS-OCTA). We studied twenty-nine eyes of 29 ESRD patients by ophthalmologic examination and SS-OCTA before and after haemodialysis. The colour-coded perfusion density maps were generated and perfused vessel density was calculated. Changes in systemic and other ocular parameters such as retinal and choroidal thickness were measured and analysed. Total perfused vessel density decreased significantly after haemodialysis in the choriocapillaris; it was not significantly different in the superficial ...
  Read Full Article
  
  Comment
  
  Mentions: Seoul National University Hanyang University
12. Wide scan imaging with swept-source optical coherent tomography for glaucoma diagnosis
  
  Explore Journals | PLOS Apr 16 2018 Ophthalmology
  
  Purpose To determine glaucoma-discriminating abilities of macular and circumpapillary retinal nerve fiber layer (cpRNFL) thickness measurements of wide scan (12X9mm) using swept-source optical coherence tomography (SS-OCT) compared to measurements of standard macula and disc scans (6 X 6 mm). Methods This retrospective chart review study included 60 glaucomatous and 62 healthy eyes of total 122 subjects who visited a glaucoma clinic and were examined with wide, standard macula, and standard disc scans of SS-OCT (DRI-OCT-1 Atlantis; Topcon Inc., Tokyo, Japan) on the same day. Thickness measurements of the ganglion cell layer plus inner plexiform layer (mGCIPL), mGCIPL plus nerve fiber ...
  Read Full Article
  
  Comment
  
  Mentions: Topcon Medical Systems Hanyang University
13. Optical coherence tomography angiography vessel density mapping at various retinal layers in healthy and normal tension glaucoma eyes
  
  Explore Home - Springer Apr 29 2017 Ophthalmology
  
  Purpose To investigate peripapillary vessel density at various spatial locations and layers in healthy and normal tension glaucoma eyes using optical coherence tomography angiography (OCTA). Methods A commercial OCTA device (AngioPlex; Carl Zeiss Meditec) was used to image microvasculature in a 6 × 6-mm optic disc region. Vessel densities of superficial and deep retinal layers were calculated using an automatic thresholding algorithm. Vessel density maps were plotted by averaging individual angiogram images. The spatial characteristics of vessel densities were analyzed at clock-hour sectors and in five 0.7-mm-thick concentric circles from a diameter of 2.0 to 5.5 mm. Areas ...
  Read Full Article
  
  Comment
  
  Mentions: Carl Zeiss Meditec
14. The Effect of Optic Disc Center Displacement on Retinal Nerve Fiber Layer Measurement Determined by Spectral Domain Optical Coherence Tomography
  
  Explore Journals | PLOS Oct 26 2016 Ophthalmology
  
  Purpose To investigate the effect of optic disc center displacement on retinal nerve fiber layer (RNFL) measurement determined by spectral domain optical coherence tomography (SD-OCT). Methods The optic disc center was manipulated at 1-pixel intervals in horizontal, vertical, and diagonal directions. According to the manipulated optic disc center location, the RNFL thickness data were resampled: (1) at a 3.46-mm diameter circle; and (2) between a 2.5-mm diameter circle and 5.4-mm square. Error was calculated between the original and resampled RNFL measurements. The tolerable error threshold of the optic disc center displacement was determined by considering test-retest variability ...
  Read Full Article
  
  Comment
  
  Mentions: Carl Zeiss Meditec
15. Retinal Nerve Fiber Layer Defect Volume Deviation Analysis Using Spectral Domain Optical Coherence Tomography
  
  Explore iovs.org Dec 13 2014 Ophthalmology
  
  Purpose: To report the retinal nerve fiber layer (RNFL) defect volume deviation according to structural RNFL loss in RNFL thickness maps Methods: RNFL defect is defined in RNFL thickness maps by the degree of RNFL loss. A 20% to 70% degree of RNFL loss was set with a 1% interval as the reference level for determining the boundary of RNFL defects. Each individual RNFL thickness map was compared to a normative database map and the region below the reference level was identified as an RNFL defect. The RNFL defect volume was calculated by summing the volumes of each pixel inside ...
  Read Full Article
  
  Comment
  
  Mentions: Hanyang University
16. Comparative study of macular ganglion cell complex thickness measured by spectral-domain optical coherence tomography in healthy eyes, eyes with preperimetric glaucoma, and eyes with early glaucoma
  
  Explore Home - Springer Mar 14 2014 Ophthalmology
  
  Purpose To evaluate the diagnostic accuracy of Topcon 3D spectral-domain optical coherence tomography (SD-OCT) for measuring the macular inner retinal layers and the circumpapillary retinal nerve fiber layer (cpRNFL) in order to detect preperimetric glaucoma. Methods Two hundred four eyes, including 64 healthy eyes, 68 eyes with preperimetric glaucoma, and 72 eyes with early glaucoma were analyzed. Patients had a comprehensive ocular examination including visual field testing and SD-OCT imaging (3D OCT-2000; Topcon Corporation, Tokyo, Japan) in the macular and peripapillary regions. OCT macular scans were segmented into the macular nerve fiber layer (mNFL), ganglion cell layer with the inner ...
  Read Full Article
  
  Comment
  
  Mentions: Topcon Medical Systems Hanyang University
17. Retinal Nerve Fiber Layer Volume Measurements in Healthy Subjects Using Spectral Domain Optical Coherence Tomography
  
  Explore LWW Online Aug 24 2013 Ophthalmology
  
  Purpose: To report retinal nerve fiber layer (RNFL) volume measurement using spectral domain optical coherence tomography (SD-OCT). We determined the characteristics and effecting factors of the RNFL volume in healthy eyes. Methods: Eighty-six eyes from 86 healthy volunteers were included. All participants underwent 3D-disc scanning using SD-OCT. We developed a computer program using Matlab software to extract RNFL thickness values from colored topographic RNFL thickness map. Total average, quadrant, and clock-hour RNFL volume were automatically calculated between 2.5 and 5 mm diameter circles using the length, width, and height of each pixel derived from the RNFL thickness map. Results ...
  Read Full Article
  
  Comment
  
  Mentions: Hanyang University
18. Macular and Peripapillary Retinal Nerve Fiber Layer Measurements by Spectral Domain Optical Coherence Tomography in Normal-Tension Glaucoma
  
  Explore iovs.org Feb 26 2010 Ophthalmology
  
  Purpose. To evaluate and compare the glaucoma discrimination ability of macular inner retinal layer (MIRL) thickness with that of peripapillary retinal nerve fiber layer (pRNFL) thickness measured by spectral-domain optical coherence tomography (RTVue-100; Optovue Inc, Fremont, CA) in patients with normal-tension glaucoma (NTG). Methods. Sixty-five healthy subjects and 102 with NTG were enrolled. MIRL thickness provided by a ganglion cell complex (GCC) scan and two RNFL thicknesses measured by the NHM4 (RNFL1) and RNFL 3.45 (RNFL2) modes of the RTVue-100 system were analyzed. The areas under the receiver operating characteristic curves (AUCs) of MIRL and pRNFL thicknesses for discriminating ...
  Read Full Article
  
  Comment
  
  Mentions: Visionix University of Ulsan Hanyang University
19. Diagnostic Comparison between Macular and Peripapillary Retinal Nerve Fiber Layer Measurements by Spectral Domain Optical Coherence Tomography in Normal-Tension Glaucoma
  
  Explore iovs.org Oct 16 2009 Ophthalmology
  
  Purpose: To evaluate and compare the glaucoma discrimination ability of macular inner retinal layer (MIRL) thickness with that of peripapillary retinal nerve fiber layer (pRNFL) thickness measured by spectral-domain optical coherence tomography (RTVue-100) in normal-tension glaucoma (NTG) patients. Methods: Sixty-five healthy and 102 NTG subjects were enrolled. MIRL thickness provided by Ganglion Cell Complex (GCC) scan and two RNFL thickness measured by the NHM4 (RNFL1) and RNFL 3.45 (RNFL2) modes were analyzed. The areas under the receiver operating characteristic curves (AUCs) of MIRL and pRNFL thicknesses, for discriminating NTG patients from controls, were determined. The AUCs were compared between ...
  Read Full Article
  
  Comment
  
  Mentions: University of Ulsan Hanyang University
20. Ability of Stratus OCT to Detect Progressive Retinal Never Fiber Layer Atrophy in Glaucoma
  
  Explore iovs.org Dec 7 2008 Ophthalmology
  
  PURPOSE. To evaluate the ability of Stratus optical coherence tomography (OCT) to detect progressive glaucomatous retinal nerve fiber layer (RNFL) atrophy observed using red-free RNFL photography. METHODS. Intersession test-retest variability of each clock hour, quadrant, and average RNFL thickness was determined using 53 control subjects. The sensitivity and specificity of OCT for identification of progressive RNFL atrophy were tested on subjects in whom this condition was clearly observed in red-free RNFL photographs (n=27) and in another control group (n=62) using criteria derived from test-retest variability. RESULTS. The sensitivity of Stratus OCT RNFL measurement ranged from 14.8% (for ...
  Read Full Article
  
  Comment
  
  Mentions: Seoul National University Carl Zeiss Meditec Yonsei University
1-20 of 20