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Retinal image analysis

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https://www.readbyqxmd.com/read/29346239/factors-associated-with-development-of-dissociated-optic-nerve-fiber-layer-appearance-in-the-pioneer-intraoperative-optical-coherence-tomography-study
#1
Anne P Runkle, Sunil K Srivastava, Alex Yuan, Peter K Kaiser, Rishi P Singh, Jamie L Reese, Justis P Ehlers
PURPOSE: To assess the relationship of dissociated optic nerve fiber layer (DONFL) and intraoperative membrane-peeling dynamics as visualized using intraoperative optical coherence tomography (OCT), and to evaluate the functional implications of DONFL. METHODS: This was a post hoc analysis of eyes undergoing membrane peeling for vitreomacular interface disorders in the prospective PIONEER intraoperative OCT study. Retinal layer measurements in preincision and postpeel intraoperative OCT images were obtained...
January 16, 2018: Retina
https://www.readbyqxmd.com/read/29340075/extracting-microtentacle-dynamics-of-tumor-cells-in-a-non-adherent-environment
#2
Eleanor C Ory, Desu Chen, Kristi R Chakrabarti, Peipei Zhang, James I Andorko, Christopher M Jewell, Wolfgang Losert, Stuart S Martin
During metastasis, tumor cells dynamically change their cytoskeleton to traverse through a variety of non-adherent microenvironments, including the vasculature or lymphatics. Due to the challenges of imaging drift in non-adhered tumor cells, the dynamic cytoskeletal phenotypes are poorly understood. We present a new approach to analyze the dynamic cytoskeletal phenotypes of non-adhered cells that support microtentacles (McTNs), which are cell surface projections implicated in metastatic reattachment. Combining a recently-developed cell tethering method with a novel image analysis framework allowed McTN attribute extraction...
December 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/29339646/automated-screening-for-diabetic-retinopathy-a-systematic-review
#3
Mads Fonager Nørgaard, Jakob Grauslund
PURPOSE: Worldwide ophthalmologists are challenged by the rapid rise in the prevalence of diabetes. Diabetic retinopathy (DR) is the most common complication in diabetes, and possible consequences range from mild visual impairment to blindness. Repetitive screening for DR is cost-effective, but it is also a costly and strenuous affair. Several studies have examined the application of automated image analysis to solve this problem. Large populations are needed to assess the efficacy of such programs, and a standardized and rigorous methodology is important to give an indication of system performance in actual clinical settings...
January 16, 2018: Ophthalmic Research
https://www.readbyqxmd.com/read/29339120/symmetry-of-peripheral-retinal-nonperfusion-in-diabetic-retinopathy-by-ischemic-index
#4
Ashley M Speilburg, Bruce Teitelbaum, Yi Pang, Shaun Ittiara
PURPOSE: Diabetic retinopathy is the leading cause of blindness among working-age adults in most developed countries. It affects eyes bilaterally and is generally believed to be symmetrical, yet there are few studies evaluating the symmetry of diabetic retinopathy. The purpose of the present study was to evaluate the symmetry of the amount of peripheral retinal ischemia in patients with diabetic retinopathy. METHODS: Ultra-widefield fluorescein angiography images were obtained on both eyes of 54 subjects, mean age 56...
January 12, 2018: Journal of Optometry
https://www.readbyqxmd.com/read/29334156/the-retinal-ganglion-cell-layer-predicts-normal-appearing-white-matter-tract-integrity-in-multiple-sclerosis-a-combined-diffusion-tensor-imaging-and-optical-coherence-tomography-approach
#5
Carolina Alves, Sónia Batista, Otília C d'Almeida, Lívia Sousa, Luís Cunha, Rui Bernardes, Miguel Castelo-Branco
We investigated the relationship between retinal layers and normal-appearing white matter (WM) integrity in the brain of patients with relapsing-remitting multiple sclerosis (MS), using a combined diffusion tensor imaging and high resolution optical coherence tomography approach. Fifty patients and 62 controls were recruited. The patients were divided into two groups according to presence (n = 18) or absence (n = 32) of optic neuritis. Diffusion tensor data were analyzed with a voxel-wise whole brain analysis of diffusion metrics in WM with tract-based spatial statistics...
January 15, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29327028/transition-metals-and-trace-elements-in-the-retinal-pigment-epithelium-and-choroid-correlative-ultrastructural-and-chemical-analysis-by-analytical-electron-microscopy-and-nano-secondary-ion-mass-spectrometry
#6
Antje Biesemeier, Oliver Eibl, Santhana Eswara, Jean-Nicolas Audinot, Tom Wirtz, Ulrich Schraermeyer
Understanding the localisation and abundance of structural elements, trace elements and especially transition metals like Cu and Zn in ocular tissue sections is important for physiology, and also for the characterisation of diseases related to oxidative stress like age-related macular degeneration. Transition metal abundances were investigated in an aged donor eye by nano-secondary ion mass spectrometry (nano-SIMS) elemental mapping using Cs+ and O- primary ions, respectively, and correlated to their respective mole fractions investigated by analytical electron microscopy (AEM)...
January 12, 2018: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/29324593/incidence-and-long-term-visual-acuity-outcomes-of-retinal-pigment-epithelium-tears-after-intravitreal-anti-vascular-endothelial-growth-factor-treatment-of-neovascular-age-related-macular-degeneration
#7
Clara Vazquez-Alfageme, Luke Nicholson, Robin D Hamilton, Praveen J Patel
PURPOSE: To report the incidence of retinal pigment epithelium tears in eyes treated with aflibercept for neovascular age-related macular degeneration and compare it with ranibizumab, and to describe long-term visual outcomes of retinal pigment epithelium tears after intensive anti-vascular endothelial growth factor treatment. METHODS: Retrospective analysis of clinical charts, spectral domain optical coherence tomography and fundus fluorescein angiography imaging of consecutive naive patients treated with intravitreal aflibercept or ranibizumab for neovascular age-related macular degeneration...
January 10, 2018: Retina
https://www.readbyqxmd.com/read/29320503/pattern-of-peripapillary-capillary-density-loss-in-ischemic-optic-neuropathy-compared-to-that-in-primary-open-angle-glaucoma
#8
Masoud Aghsaei Fard, Yanin Suwan, Sasan Moghimi, Lawrence S Geyman, Toco Y Chui, Richard B Rosen, Robert Ritch
PURPOSE: Both non-arteritic anterior ischemic optic neuropathy (NAION) and primary open-angle glaucoma (POAG) damage retinal ganglion cell axons, which are perfused by the radial peripapillary capillaries. To evaluate the pattern of ischemia, we compared peripapillary capillary density (PCD) in NAION eyes to POAG eyes matched for visual field mean deviation and retinal nerve fiber layer thickness. METHODS: 31 chronic NAION (>6 months after the acute event) and unaffected fellow eyes (31 subjects), 42 moderate and severe POAG eyes (27 subjects), and 77 control eyes (46 healthy subjects) were imaged with a commercial optical coherence tomography angiography system (AngioVue, Avanti RTVue-XR, Optovue, CA) at two academic institutions...
2018: PloS One
https://www.readbyqxmd.com/read/29318448/elevated-serum-igf-1-level-enhances-retinal-and-choroidal-thickness-in-untreated-acromegaly-patients
#9
Xia Zhang, Jin Ma, Yuhan Wang, Lüe Li, Lu Gao, Xiaopeng Guo, Bing Xing, Yong Zhong
PURPOSE: 1) To compare the retinal, choroidal, Haller's layer, and Sattler's/choriocapillaris thicknesses of untreated acromegaly patients without chiasm compression or diabetes mellitus and healthy controls. 2) To evaluate the correlations of retinal and choroidal thicknesses with serum growth hormone (GH) and insulin-like growth factor 1 (IGF) burden. METHODS: This prospective, case-control study included 27 untreated acromegaly patients and 27 sex-matched and age-matched controls...
January 10, 2018: Endocrine
https://www.readbyqxmd.com/read/29318383/optical-coherence-tomography-angiography-a-review-of-current-and-future-clinical-applications
#10
REVIEW
Marcus Ang, Anna C S Tan, Chui Ming Gemmy Cheung, Pearse A Keane, Rosa Dolz-Marco, Chelvin C A Sng, Leopold Schmetterer
Optical coherence tomography angiography is a non-invasive imaging technique that now allows for simultaneous in vivo imaging of the morphology as well as the vasculature in the eye. In this review, we provide an update on the existing clinical applications of optical coherence tomography angiography technology from the anterior to posterior segment of the eye. We also discuss the limitations of optical coherence tomography angiography technology, as well as the caveats to the interpretation of images. As current optical coherence tomography angiography systems are optimized for the retina, most studies have focused on interpreting images from conditions such as age related macular degeneration and retinal vascular diseases...
January 9, 2018: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/29315318/correlative-light-and-immuno-electron-microscopy-of-retinal-tissue-cryostat-sections
#11
Thomas Burgoyne, Amelia Lane, William E Laughlin, Michael E Cheetham, Clare E Futter
Correlative light-electron microscopy (CLEM) is a powerful technique allowing localisation of specific macromolecules within fluorescence microscopy (FM) images to be mapped onto corresponding high-resolution electron microscopy (EM) images. Existing methods are applicable to limited sample types and are technically challenging. Here we describe novel methods to perform CLEM and immuno-electron microscopy (iEM) on cryostat sections utilising the popular FM embedding solution, optimal cutting temperature (OCT) compound...
2018: PloS One
https://www.readbyqxmd.com/read/29305715/long-term-clinical-course-of-2-japanese-patients-with-prpf31-related-retinitis-pigmentosa
#12
Kentaro Kurata, Katsuhiro Hosono, Yoshihiro Hotta
PURPOSE: To assess the long-term clinical course of 2 patients with PRPF31-related retinitis pigmentosa (RP). PATIENTS AND METHODS: We clinically examined 2 unrelated patients with RP and collected peripheral blood samples from them. Ophthalmic examinations, including best-corrected visual acuity measurements, Goldmann perimetry, full-field electroretinography, fundus autofluorescence imaging, and optical coherence tomography, were also performed. The visual acuity and visual field were continuously monitored...
January 5, 2018: Japanese Journal of Ophthalmology
https://www.readbyqxmd.com/read/29304265/segmental-analysis-of-macular-layers-in-patients-with-rhegmatogenous-retinal-detachment-treated-with-perfluoropropane-or-silicon-oil
#13
Yasin Sakir Goker, Kemal Yuksel, Miray Faiz Turan, Kenan Sonmez, Kemal Tekin, Pelin Yilmazbas
BACKGROUND AND OBJECTIVE: To determine possible changes in thickness profiles of retinal layers in patients with rhegmatogenous retinal detachment (RRD) treated with perfluoropropane (C3F8) or silicon oil (SiO). PATIENTS AND METHODS: Seventy-two eyes of 36 patients were enrolled in this retrospective comparative study. Patients were divided into two groups according to intraocular tamponade: C3F8 or SiO. All study eyes were compared with fellow eyes via spectral-domain optical coherence tomography segment analysis at 6 months postoperatively...
January 1, 2018: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/29299741/functional-and-structural-outcomes-of-ilm-peeling-in-uncomplicated-macula-off-rrd-using-microperimetry-en-face-oct
#14
Mohamed Gaber Ahmed Mohamed Eissa, Mohamad Amr Salah Eddin Abdelhakim, Tamer Ahmed Macky, Mohamed Mahmoud Khafagy, Hassan Aly Mortada
PURPOSE: To investigate functional and structural outcomes of internal limiting membrane (ILM) peeling during primary vitrectomy for uncomplicated macula-off rhegmatogenous retinal detachment (RRD). METHODS: In this prospective interventional randomized comparative study, 43 eyes (43 patients) were randomly divided into group A (20), and group B (23), with and without ILM peeling respectively. Patients were evaluated clinically, and by spectral-domain optical coherence tomography (SD-OCT) and microperimetry (MP) following silicone oil removal...
January 3, 2018: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/29283911/dynamic-retina-vessel-color-change-during-ocular-compression-in-severe-lipemia-retinalis
#15
Maria Benson, Robert W Wong, Ryan C Young, James B Gibson, Yuxin Fan, Clio Armitage Harper
PURPOSE: The aim of this study was to describe dynamic color change in retinal vessels from white to coral pink due to externally applied ocular pressure in a 6-week-old infant with lipemia retinalis secondary to type 1b familial hyperlipoproteinemia. METHODS: Fundus images and fluorescein angiogram were taken with RetCam3 camera. Color photographs of pooled blood were taken during phlebotomy. RESULTS: Genetic analysis revealed a rare genetic mutation in the APOC2 gene, a lipoprotein lipase activator...
December 27, 2017: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/29281690/sensitivity-and-specificity-of-automated-analysis-of-single-field-non-mydriatic-fundus-photographs-by-bosch-dr-algorithm-comparison-with-mydriatic-fundus-photography-etdrs-for-screening-in-undiagnosed-diabetic-retinopathy
#16
Pritam Bawankar, Nita Shanbhag, S Smitha K, Bodhraj Dhawan, Aratee Palsule, Devesh Kumar, Shailja Chandel, Suneet Sood
Diabetic retinopathy (DR) is a leading cause of blindness among working-age adults. Early diagnosis through effective screening programs is likely to improve vision outcomes. The ETDRS seven-standard-field 35-mm stereoscopic color retinal imaging (ETDRS) of the dilated eye is elaborate and requires mydriasis, and is unsuitable for screening. We evaluated an image analysis application for the automated diagnosis of DR from non-mydriatic single-field images. Patients suffering from diabetes for at least 5 years were included if they were 18 years or older...
2017: PloS One
https://www.readbyqxmd.com/read/29276052/nonsyndromic-retinitis-pigmentosa-in-the-ashkenazi-jewish-population-genetic-and-clinical-aspects
#17
Adva Kimchi, Samer Khateb, Rong Wen, Ziqiang Guan, Alexey Obolensky, Avigail Beryozkin, Shoshi Kurtzman, Anat Blumenfeld, Eran Pras, Samuel G Jacobson, Tamar Ben-Yosef, Hadas Newman, Dror Sharon, Eyal Banin
PURPOSE: To analyze the genetic and clinical findings in retinitis pigmentosa (RP) patients of Ashkenazi Jewish (AJ) descent, aiming to identify genotype-phenotype correlations. DESIGN: Cohort study. PARTICIPANTS: Retinitis pigmentosa patients from 230 families of AJ origin. METHODS: Sanger sequencing was performed to detect specific founder mutations known to be prevalent in the AJ population. Ophthalmologic analysis included a comprehensive clinical examination, visual acuity (VA), visual fields, electroretinography, color vision testing, and retinal imaging by OCT, pseudocolor, and autofluorescence fundus photography...
December 22, 2017: Ophthalmology
https://www.readbyqxmd.com/read/29258454/atypical-acute-retinal-necrosis-accompanied-by-terson-s-syndrome-a-case-report
#18
Jong Young Lee, Dong Yoon Kim, Hye Jin Lee, Jin Ho Jeong, Sung Pyo Park, Jin Young Kim
BACKGROUND: Acute retinal necrosis (ARN) has characterized by panuveitis, vitritis, severe vaso-occlusive vasculitis, and diffuse necrotizing retinitis. There are no case reports on atypical ARN combined with Terson's syndrome. Herein, we report a case of ARN with atypical clinical features combined with Terson's syndrome that we successfully treated by intravitreal ganciclovir injection. CASE PRESENTATION: A 64-year-old man visited our eye clinic with a complaint of decreased visual acuity in his right eye...
December 19, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/29249973/odorant-receptor-51e2-agonist-%C3%AE-ionone-regulates-rpe-cell-migration-and-proliferation
#19
Nikolina Jovancevic, Soumaya Khalfaoui, Markus Weinrich, Daniel Weidinger, Annika Simon, Benjamin Kalbe, Marcus Kernt, Anselm Kampik, Günter Gisselmann, Lian Gelis, Hanns Hatt
The odorant receptor 51E2 (OR51E2), which is well-characterized in prostate cancer cells and epidermal pigment cells, was identified for the first time as the most highly expressed OR in human fetal and adult retinal pigment epithelial (RPE) cells. Immunofluorescence staining and Western blot analysis revealed OR51E2 localization throughout the cytosol and in the plasma membrane. Additionally, immunohistochemical staining of diverse layers of the eye showed that the expression of OR51E2 is restricted to the pigment cells of the RPE and choroid...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29249337/arteriovenous-ratio-and-papilledema-based-hybrid-decision-support-system-for-detection-and-grading-of-hypertensive-retinopathy
#20
Shahzad Akbar, Muhammad Usman Akram, Muhammad Sharif, Anam Tariq, Ubaid Ullah Yasin
BACKGROUND AND OBJECTIVES: Hypertensive Retinopathy (HR) is a retinal disease which happened due to consistent high blood pressure (hypertension). In this paper, an automated system is presented that detects the HR at various stages using arteriovenous ratio and papilledema signs through fundus retinal images. METHODS: The proposed system consists of two modules i.e. vascular analysis for calculation of arteriovenous ratio and optic nerve head (ONH) region analysis for papilledema...
February 2018: Computer Methods and Programs in Biomedicine
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