All Articles from Takuhei Shoji -Optical Coherence Tomography News

Articles from Takuhei Shoji

1-18 of 18
1. OCT angiography measured changes in the foveal avascular zone area after glaucoma surgery
  
  Explore BJO Online Nov 12 2020 Ophthalmology
  
  Background/aims: To evaluate quantitative changes in the foveal avascular zone (FAZ) area after glaucoma surgery using swept-source optical coherence tomography angiography (SS-OCTA). Methods: Fifty-four consecutive patients with primary open-angle glaucoma (POAG) who met the inclusion criteria and underwent unilateral glaucoma surgery to reduce intraocular pressure (IOP) between April 2018 and July 2019.Eyes underwent IOP-lowering glaucoma surgery and their fellow (non-surgical) eyes were included. OCTA of the macula was performed in both eyes before glaucoma surgery and 3 months postoperatively. Two blinded examiners reviewed the image quality. Within- and between-group comparisons of the FAZ area and correlation of the ...
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  Mentions: UCSD Robert N. Weinreb
2. Glaucomatous vertical vessel density asymmetry of the temporal raphe detected with optical coherence tomography angiography
  
  Explore Nature Publishing Group Apr 26 2020 Ophthalmology
  
  Changes in retinal vasculature and ocular circulation may play an important role in the glaucoma development and progression. We evaluated the vertical asymmetry across the temporal raphe of the deep retinal layer vessel density, using swept-source optical coherence tomography angiography (SS-OCTA), and its relationship with the central visual field (VF) loss. Thirty-four eyes of 27 patients with open-angle glaucoma were included. SS-OCTA macular scanning was performed within a 3 × 3 mm (300 × 300 pixels) volume, centred on the fovea. The relationships between the vertical asymmetrical deep retinal vessel density reduction (ADRVD) across the temporal raphe and various ocular parameters were ...
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  Mentions: UCSD Robert N. Weinreb Makoto Araie
3. Association between axial length and in vivo human crystalline lens biometry during accommodation: a swept-source optical coherence tomography study
  
  Explore Home - Springer Nov 26 2019 Ophthalmology
  
  Purpose To evaluate the association between axial length and crystalline lens biometry with and without accommodation using the CASIA2 swept-source (SS) optical coherence tomography (OCT) system on the anterior segment. Study design Intervention study. Methods Individuals aged 20 to 39 years were enrolled for SS-OCT imaging at 2 separate visits within 1 week. Each eye was imaged under accommodation stimuli with different amplitudes (0 D, -1 D, -3 D, -5 D, and -7 D). The anterior and posterior lens curvature radii and lens thicknesses were measured. The participants were divided into 4 groups according to axial length. Results Forty-eight participants ...
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4. Automated Measurement of the Foveal Avascular Zone in Swept-Source Optical Coherence Tomography Angiography Images
  
  Explore TVST Journal Jun 4 2019 Ophthalmology
  
  Purpose : The purpose of this study was to evaluate automated measurement of the foveal avascular zone (FAZ) area using the Kanno-Saitama macro (KSM) software in Image J with swept-source optical coherence tomography angiography (SS-OCTA) images. Methods : In this cross-sectional study, one photographer scanned the macular area (3 × 3 mm) of healthy volunteers twice on the same day, at the same time. The FAZ area was measured from the en face image of the superficial retinal layer by two masked examiners, using the KSM and the Advanced Retina Imaging (ARI)-network method in Carl Zeiss online analysis. Intra- and interscan reproducibility ...
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  Mentions: Carl Zeiss Meditec
5. Association of Macular and Circumpapillary Microvasculature with Visual Field Sensitivity in Advanced Glaucoma
  
  Explore American Journal of Ophthalmology Mar 13 2019 Ophthalmology
  
  Purpose To evaluate the association between optical coherence tomography angiography (OCTA) macular and circumpapillary vessel density and visual field mean deviation (MD) in advanced primary open angle glaucoma (POAG). Design Cross-sectional study. Methods Macula (superficial layer) and optic nerve head [ONH, with (capillary density :CD) and without (vessel density: VD) automated removal of large vessels] OCTA of 34 eyes (34 patients, MD < -10 dB) were investigated as macula whole image VD (wiVD), parafoveal VD (pfVD), ONH wiVD, wiCD, circumpapillary VD (cpVD), and cpCD. Spectral domain OCT circumpapillary retinal nerve fiber layer (cpRNFL), macular ganglion cell complex (GCC) and ganglion cell ...
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  Mentions: UCSD Robert N. Weinreb Christopher Bowd
6. Reproducibility of Macular Vessel Density Calculations Via Imaging With Two Different Swept-Source Optical Coherence Tomography Angiography Systems
  
  Explore TVST Journal Dec 26 2018 Ophthalmology
  
  Purpose : To evaluate the reproducibility of vessel density calculations using different binarization methods obtained via two commercially available swept-source optical coherence tomography angiography (SS-OCTA) systems. Methods : Healthy volunteers were imaged using two swept-source optical coherence tomography angiography (SS-OCTA) devices, PLEXElite and Triton. SS-OCTA examinations were performed using a 3 × 3-mm volume scan pattern centered on the fovea. A total of six methods were used for binarization in ImageJ, two global thresholding and four local adaptive thresholding methods. Resultant vessel density values were compared between the instruments and binarization methods. Images for 60 eyes from 30 healthy subjects were assessed by ...
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  Mentions: Topcon Medical Systems Carl Zeiss Meditec
7. Evaluation of microvascular changes in the macular area of eyes with rhegmatogenous retinal detachment without macular involvement using swept-source optical coherence tomography angiography
  
  Explore Medical Journals Publisher Oct 14 2018 Ophthalmology
  
  Purpose: To evaluate microvascular changes in the macular area of eyes with rhegmatogenous retinal detachment (RRD) without macular involvement (macula-on RRD) using swept-source optical coherence tomography angiography (SS-OCTA). Patients and methods: Five patients with macula-on RRD were eligible for analysis. All patients underwent SS-OCTA examination (Triton) for the macular area. The healthy fellow eyes were included as controls. The vessel density (VD) was calculated using binarization, and the foveal avascular zone (FAZ) was measured. The VD and FAZ area were compared between the eyes with RRD and the fellow eyes using the Wilcoxon signed rank test. Results: The patients’ clinical ...
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8. Optic disc microvasculature dropout in primary open-angle glaucoma measured with optical coherence tomography angiography
  
  Explore Journals | PLOS Aug 7 2018 Ophthalmology
  
  Purpose To evaluate microvasculature dropout in the optic disc (Mvd-D) using optical coherence tomography angiography (OCTA) and investigate factors associated with Mvd-D in primary open-angle glaucoma (POAG) eyes. Methods One hundred twenty-three eyes of 123 POAG patients were included from the Diagnostic Innovations in Glaucoma Study. The 3.0×3.0-mm optic nerve head OCTA scans were acquired using a spectral-domain OCT instrument. Images with whole-signal-mode were evaluated. Eyes were classified into 3 categories (Mvd-D, pseudo-Mvd-D, and no Mvd-D). Mvd-D and pseudo-Mvd-D had complete loss of OCTA signals on the temporal side of the optic disc on the en face ...
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  Mentions: National Institutes of Health Optovue Topcon Medical Systems
9. Optic disc vessel density in nonglaucomatous and glaucomatous eyes: an enhanced-depth imaging optical coherence tomography angiography study
  
  Explore Medical Journals Publisher Jun 19 2018 Ophthalmology
  
  Purpose: To evaluate the ability of enhanced-depth imaging (EDI) optical coherence tomography angiography (OCTA) to detect vascular signals inside the glaucomatous optic disc. Patients and methods: Ten glaucomatous eyes of 8 subjects and 11 nonglaucomatous eyes of 7 subjects underwent EDI and conventional OCTA for optic disc analysis. The optic disc vessel density (VD) at maximum scan depth (2 mm) was compared between the 2 methods and between glaucomatous and nonglaucomatous eyes. Regression analysis was used to determine the factors affecting disc VD. Results: The median (25th, 75th percentile) of the visual field mean deviation was –20.5 (–25.1 ...
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  Mentions: Masanori Hangai
10. Optical Coherence Tomography Angiography Macular Vascular Density Measurements and the Central 10-2 Visual Field in Glaucoma
  
  Explore LWW Online Apr 26 2018 Ophthalmology
  
  Purpose: To evaluate the association between macula vascular density assessed by optical coherence tomography angiography (OCT-A) and central visual field (VF) threshold sensitivities in healthy, glaucoma suspect and glaucoma patients. Methods: A total of 185 eyes from 38 healthy participants, 31 glaucoma suspects, 72 mild glaucoma patients, and 44 moderate/severe glaucoma patients from the Diagnostic Innovations in Glaucoma Study who underwent OCT-A images of the macula and 10-2 VF testing were enrolled in this observational cross-sectional study. The relationship between central VF mean sensitivity and superficial macula whole-image vessel density (wiVD), and the relationship between the MS of the ...
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  Mentions: UCSD Robert N. Weinreb Linda M. Zangwill
11. Inter-eye Asymmetry of Optical Coherence Tomography Angiography Vessel Density in Bilateral Glaucoma, Glaucoma Suspect, and Healthy Eyes
  
  Explore American Journal of Ophthalmology Mar 26 2018 Ophthalmology
  
  Purpose To investigate inter-eye retinal vessel density asymmetry in healthy, glaucoma suspect, and mild to moderate glaucoma subjects, and its potential utility for early detection of glaucomatous damage. Design Cross-sectional study. Methods 153 subjects including 55 healthy, 32 glaucoma suspect, and 66 glaucoma subjects enrolled in the Diagnostic Innovations in Glaucoma Study(DIGS). Vessel density was obtained from optical coherence tomography angiography (OCT-A) macular and optic nerve head scans. Thickness of peripapillary retinal nerve fiber layer (RNFL) and macular ganglion cell complex (mGCC) was measured with spectral-domain optical coherence tomography (SD-OCT) scans. Inter-eye asymmetry was calculated by taking the absolute ...
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  Mentions: UCSD Robert N. Weinreb Linda M. Zangwill
12. The Association between Macula and ONH Optical Coherence Tomography Angiography (OCT-A) Vessel Densities in Glaucoma, Glaucoma Suspect and Healthy Eyes
  
  Explore LWW Online Jan 9 2018 Ophthalmology
  
  Purpose: To evaluate strength of associations between Optical Coherence Tomography-Angiography (OCT-A) vessel density (VD) measurements in the macula and peripapillary region of the optic nerve head (ONH) with standard structural OCT thickness measures. Methods: This cross-sectional study included 333 eyes of 219 primary open angle glaucoma patients, 41 glaucoma suspects, and 73 healthy participants from the Diagnostics Innovations in Glaucoma Study (DIGS) with good quality OCT-A images. The strength of associations between microvasculature measures in the ONH retinal nerve fiber layer (RNFL) and superficial macula layer was assessed using linear regression models. Associations between ONH and macula VD, and circumpapillary ...
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  Mentions: UCSD Robert N. Weinreb Felipe A. Medeiros
13. Glaucomatous changes in lamina pores shape within the lamina cribrosa using wide bandwidth, femtosecond mode-locked laser OCT
  
  Explore Journals | PLOS Jul 25 2017 Ophthalmology
  
  Purpose The lamina cribrosa (LC) is known to play a critical role in the pathogenesis of glaucoma. Although it has been reported that striae-shaped or slit-shaped lamina pores are more frequent in eyes with primary open angle glaucoma (POAG), this observation is based only on fundus photography. The primary object of this study is to perform layer-by-layer comparisons of the shape of lamina pores within the LC in vivo. Design Cross-sectional study. Methods Optic nerve head B-scans were obtained using custom-made broad-wavelength optical coherence tomography with a mode-locked laser. A total of 300 single B-scans per eye were obtained and ...
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  Mentions: National Institutes of Health Heidelberg Engineering Topcon Medical Systems
14. In vivo crystalline lens measurements with novel swept-source optical coherent tomography: an investigation on variability of measurement
  
  Explore Home | BMJ Open Ophthalmology Mar 7 2017 Ophthalmology
  
  Objective To evaluate the reproducibility of in vivo crystalline lens measurements obtained by novel commercially available swept-source (SS) optical coherence tomography (OCT) specifically designed for anterior segment imaging. Methods and analysis One eye from each of 30 healthy subjects was randomly selected using the CASIA2 (Tomey, Nagoya, Japan) in two separate visits within a week. Each eye was imaged twice. After image scanning, the anterior and posterior lens curvatures and lens thickness were calculated automatically by the CASIA2 built-in program at 0 dioptre (D) (static), −1 D, −3 D and −5 D accommodative stress. The intraobserver and intervisit reproducibility coefficient ...
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  Mentions: Tomey Corporation
15. Correlation between Lamina Cribrosa Tilt Angles, Myopia and Glaucoma Using OCT with a Wide Bandwidth Femtosecond Mode-Locked Laser
  
  Explore PLoS ONE Jan 1 2015 Ophthalmology
  
  Purpose To measure horizontal and vertical lamina cribrosa (LC) tilt angles and investigate associated factors using prototype optical coherence tomography (OCT) with a broad wavelength laser light source. Design Cross sectional study. Methods Twenty-eight no glaucoma eyes (from 15 subjects) and 25 glaucoma eyes (from 14 patients) were enrolled. A total of 300 optic nerve head B-scans were obtained in 10 µm steps and the inner edge of Bruch's membrane opening (BMO) was identified as the reference plane. The vertical and horizontal angles between BMO line and approximate the best-fitting line for the surface of the LC were measured ...
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  Mentions: Masanori Hangai Makoto Araie
16. Three-dimensional optic nerve head images using optical coherence tomography with a broad bandwidth, femtosecond, and mode-locked laser
  
  Explore Home - Springer Dec 16 2014 Ophthalmology
  
  Purpose The aim of this study was to demonstrate the fine laminar structure of the optic nerve head (ONH), in vivo, using a broad wavelength, ultra-high resolution, and optically coherent tomography (OCT) system. Methods This high-resolution OCT system, based on a 200 nm bandwidth spectrometer and an 8 femtosecond ultra-short, mode-locked, coherent laser light source, enabled in vivo cross-sectional ONH imaging with 2.0 μm axial resolution. A total of 300 optic disc B-scans, which consisted of 300 × 2048 pixels, were obtained in 10 μm steps. Three-dimensional images were rendered from these images to obtain n face images of the ...
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  Mentions: Jost B. Jonas Makoto Araie
17. Impact of high myopia on the performance of SD-OCT parameters to detect glaucoma
  
  Explore SpringerLink Home May 4 2012 Ophthalmology
  
  Abstract Background The aim was to evaluate the effects of high myopia on spectral-domain optical coherence tomography (SD-OCT) parameters, as well as on their ability to detect glaucoma. Methods Ninety-three glaucoma and 86 non-glaucoma patients were divided into highly myopic group (HMG; 90 subjects, ≤ −5 diopters [D]) and emmetropic (EG; 89 subjects, spherical equivalent ≤1 D and ≥ −1D) groups in this cross-sectional comparative study. Macular ganglion cell complex (GCC) and circumpapillary retinal nerve fiber layer (cpRNFL) measurements obtained from the algorithms of the SD-OCT system were compared. The effects of refractive errors and glaucoma were assessed using a generalized linear ...
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18. Assessment of glaucomatous changes in subjects with high myopia using spectral domain optical coherence tomography
  
  Explore iovs.org Nov 6 2010 Ophthalmology
  
  Purpose: To evaluate the diagnostic ability to detect glaucoma in highly myopic eyes using RTvue-100 spectral domain-optical coherence tomography (SD-OCT) parameters (RTVue-100; Optovue Inc., CA). Design: Cross-sectional comparative study Methods: A total of 82 patients with high myopia (≤ -5 D) presented between April 2008 and August 2009. Subjects comprised 31 participants with high myopia but not perimetric glaucoma (no glaucoma group, NGG) and 51 patients with high myopia and concomitant perimetric glaucoma (glaucoma group, GG). Ganglion cell complex (GCC), circumpapillary retinal nerve fiber layer (p-RNFL) and disc configuration parameters were obtained from algorithms of the RTVue-100 system and subsequently compared ...
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  Mentions: Optovue
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