1. Articles from Elena Garcia-Martin

    1-24 of 27 1 2 »
    1. Swept source optical coherence tomography to early detect multiple sclerosis disease. The use of machine learning techniques

      Swept source optical coherence tomography to early detect multiple sclerosis disease. The use of machine learning techniques

      Objective To compare axonal loss in ganglion cells detected with swept-source optical coherence tomography (SS-OCT) in eyes of patients with multiple sclerosis (MS) versus healthy controls using different machine learning techniques. To analyze the capability of machine learning techniques to improve the detection of retinal nerve fiber layer (RNFL) and the complex Ganglion Cell Layer–Inner plexiform layer (GCL+) damage in patients with multiple sclerosis and to use the SS-OCT as a biomarker to early predict this disease. Methods Patients with relapsing-remitting MS (n = 80) and age-matched healthy controls (n = 180) were enrolled. Different protocols from the DRI SS-OCT Triton ...

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    2. Ability of Swept-Source Optical Coherence Tomography to Detect Retinal and Choroidal Changes in Patients with Multiple Sclerosis

      Ability of Swept-Source Optical Coherence Tomography to Detect Retinal and Choroidal Changes in Patients with Multiple Sclerosis

      Purpose . To evaluate the ability of new swept-source (SS) optical coherence tomography (OCT) technology to detect changes in retinal and choroidal thickness in patients with multiple sclerosis (MS). Methods . A total of 101 healthy and 97 MS eyes underwent retinal and choroidal assessment using SS Triton OCT (Topcon). Macular thickness and peripapillary data (retinal, ganglion cell layer (GCL+, GCL++) and retinal nerve fiber layer (RNFL) thickness) were analyzed, including choroidal thickness evaluation. Results . Significant macular thinning was observed in all ETDRS areas ( ) in MS patients. Peripapillary retinal, RNFL, and GCL ++ thickness showed a significant reduction in patients in all sectors ...

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    3. Ability of swept source OCT to detect retinal changes in patients with bipolar disorder

      Ability of swept source OCT to detect retinal changes in patients with bipolar disorder

      Purpose To evaluate the ability of swept source optical coherence tomography (SS-OCT) to detect retinal changes in patients with bipolar disorder (BD). Methods Twenty-three patients with BD and 23 controls underwent retinal evaluation using SS deep range imaging (DRI) Triton OCT. Full retinal thickness, the ganglion cell layer (GCL), the retinal nerve fiber layer (RNFL), and choroidal thickness were evaluated with automated segmentation software. Results Patients with BD were shown to have significant thinning of the macular full retinal thickness in the center ( p  = 0.049), inner temporal ( p  = 0.045), inner nasal ( p  = 0.016), and inner inferior ( p ...

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    4. Retinal thickness measured with optical coherence tomography and risk of disability worsening in multiple sclerosis: a cohort study

      Retinal thickness measured with optical coherence tomography and risk of disability worsening in multiple sclerosis: a cohort study

      Background Most patients with multiple sclerosis without previous optic neuritis have thinner retinal layers than healthy controls. We assessed the role of peripapillary retinal nerve fibre layer (pRNFL) thickness and macular volume in eyes with no history of optic neuritis as a biomarker of disability worsening in a cohort of patients with multiple sclerosis who had at least one eye without optic neuritis available. Methods In this multicentre, cohort study, we collected data about patients (age ≥16 years old) with clinically isolated syndrome, relapsing-remitting multiple sclerosis, and progressive multiple sclerosis. Patients were recruited from centres in Spain, Italy, France, Germany ...

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    5. Retinal and Choroidal Changes in Patients with Parkinson’s Disease Detected by Swept-Source Optical Coherence Tomography

      Retinal and Choroidal Changes in Patients with Parkinson’s Disease Detected by Swept-Source Optical Coherence Tomography

      Purpose : To evaluate the ability of new Swept source (SS) optical coherence tomography (OCT) technology to detect changes in retinal and choroidal thickness in patients with Parkinson’s disease (PD). Design : Observational case–control cross sectional study, developed from January to May 2016. Methods : In total, 50 eyes from 50 patients diagnosed with PD and 54 eyes of 54 healthy controls underwent retinal and choroidal assessment using SS DRI Triton OCT (Topcon), using the 3D Wide protocol. Total macular thickness and peripapillary data (retinal, ganglion cell layer [GCL+, GCL++] and retinal nerve fiber layer [RNFL] thickness) were analyzed. Macular and ...

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    6. Optical Coherence Tomography as a Biomarker for Diagnosis, Progression, and Prognosis of Neurodegenerative Diseases

      Optical Coherence Tomography as a Biomarker for Diagnosis, Progression, and Prognosis of Neurodegenerative Diseases

      Neurodegenerative diseases present a current challenge for accurate diagnosis and for providing precise prognostic information. Developing imaging biomarkers for multiple sclerosis (MS), Parkinson disease (PD), and Alzheimer’s disease (AD) will improve the clinical management of these patients and may be useful for monitoring treatment effectiveness. Recent research using optical coherence tomography (OCT) has demonstrated that parameters provided by this technology may be used as potential biomarkers for MS, PD, and AD. Retinal thinning has been observed in these patients and new segmentation software for the analysis of the different retinal layers may provide accurate information on disease progression and ...

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    7. Evaluation of Early Graft Detachment After Descemet Membrane Endothelial Keratoplasty Using New Swept-Source Optical Coherence Tomography

      Evaluation of Early Graft Detachment After Descemet Membrane Endothelial Keratoplasty Using New Swept-Source Optical Coherence Tomography

      Purpose: To evaluate the ability of Swept-source optical coherence tomography (SS-OCT) in detecting early endothelial graft detachment after Descemet membrane endothelial keratoplasty (DMEK) and to determine the possible causes of graft detachment using 2 different protocols for anterior segment (AS) imaging. Methods: Eight eyes from 8 consecutive DMEK surgeries were evaluated. High-resolution images were captured with SS-OCT using 2 different radial protocols for AS imaging (16- and 6-mm radial protocols). Central and peripheral corneal changes were evaluated. Results: All eyes developed early graft detachment detectable with the SS-OCT. The 16-mm radial protocol scanned the cornea detecting early graft detachment in ...

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    8. Retinal thickness measured with optical coherence tomography and risk of disability worsening in multiple sclerosis: a cohort study

      Retinal thickness measured with optical coherence tomography and risk of disability worsening in multiple sclerosis: a cohort study

      Background Most patients with multiple sclerosis without previous optic neuritis have thinner retinal layers than healthy controls. We assessed the role of peripapillary retinal nerve fibre layer (pRNFL) thickness and macular volume in eyes with no history of optic neuritis as a biomarker of disability worsening in a cohort of patients with multiple sclerosis who had at least one eye without optic neuritis available. Methods In this multicentre, cohort study, we collected data about patients (age ≥16 years old) with clinically isolated syndrome, relapsing-remitting multiple sclerosis, and progressive multiple sclerosis. Patients were recruited from centres in Spain, Italy, France, Germany ...

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    9. Neural Network Analysis of Different Segmentation Strategies of Nerve Fiber Layer Assessment for Glaucoma Diagnosis

      Neural Network Analysis of Different Segmentation Strategies of Nerve Fiber Layer Assessment for Glaucoma Diagnosis

      Purpose: To compare the diagnostic performance of different segmentations of the nerve fiber layer (NFL) thickness measurements using an artificial neural network and to define the optimal number of sectors with best diagnostic ability for glaucoma diagnosis. Methods: A total of 117 glaucoma patients and 123 normal subjects were included in the study. NFL thickness measurements were performed using the Spectralis-OCT (Heidelberg Engineering) to obtain the NFL thickness average; measurements from 2 semicircles, 4 quadrants, and 6, 8, 12, 16, 24, 32, and 64 sectors; and 768 uniformly divided locations around the peripapillary NFL. An artificial neural network evaluation was ...

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    10. Potential new diagnostic tool for Alzheimer's disease using a linear discriminant function for Fourier domain optical coherence tomography

      Potential new diagnostic tool for Alzheimer's disease using a linear discriminant function for Fourier domain optical coherence tomography

      Purpose: To calculate and validate a linear discriminant function (LDF) for Fourier domain optical coherence tomography (OCT) to improve the diagnostic ability of retinal and retinal nerve fiber layer (RNFL) thickness parameters in the detection of Alzheimer's disease (AD). Method: AD patients (n=151) and age-matched, healthy subjects (n=61) were enrolled. The Cirrus and Spectralis OCT systems were used to obtain retinal measurements and circumpapillary RNFL thickness for each participant. A LDF was calculated using all retinal and RNFL OCT measurements. Receiver operating characteristic (ROC) curves were plotted and compared among the LDF and the standard parameters provided ...

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    11. Electrophysiology and optical coherence tomography to evaluate Parkinson disease severity

      Electrophysiology and optical coherence tomography to evaluate Parkinson disease severity

      Objective: To evaluate correlations between visual evoked potentials (VEP), pattern electroretinogram (PERG), and macular and retinal nerve fiber layer (RNFL) thickness measured by optical coherence tomography (OCT) and the severity of Parkinson disease (PD). Methods: Forty-six PD patients and 33 age and sex-matched healthy controls were enrolled, and underwent VEP, PERG, and Cirrus and Spectralis OCT measurements of macular and RNFL thicknesses, and evaluation of PD severity using the Hoehn & Yahr scale to measure PD symptom progression, the Schwab and England Activities of Daily Living Scale (SE-ADL) to evaluate patient quality of life (QOL), and disease duration. Logistical regression was ...

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    12. Retinal Layer Segmentation in Patients with Multiple Sclerosis Using Spectral Domain Optical Coherence Tomography

      Retinal Layer Segmentation in Patients with Multiple Sclerosis Using Spectral Domain Optical Coherence Tomography

      Purpose To evaluate the thickness of the 10 retinal layers in the paramacular area of patients with multiple sclerosis (MS) compared with healthy subjects using the new segmentation technology of spectral domain optical coherence tomography (OCT). To examine which layer has better sensitivity for detecting neurodegeneration in patients with MS. Design Observational, cross-sectional study. Participants Patients with MS (n = 204) and age-matched healthy subjects (n = 138). Methods The Spectralis OCT system (Heidelberg Engineering, Inc., Heidelberg, Germany) was used to obtain automated segmentation of all retinal layers in a parafoveal scan in 1 randomly selected eye of each participant, using the ...

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    13. Influence of cataract surgery on repeatability and measurements of spectral domain optical coherence tomography

      Influence of cataract surgery on repeatability and measurements of spectral domain optical coherence tomography

      Backgrounds/aims To evaluate the effect of uncomplicated cataract phacoemulsification on the measurements of macular and retinal nerve fibre layer (RNFL) in healthy subjects using two spectral domain (SD) optical coherence tomography (OCT) instruments—Cirrus OCT (Zeiss) and Spectralis OCT (Heidelberg)—and to assess the reliability of the measurements obtained with these two devices before and after cataract surgery. Methods The study included 60 eyes of 60 healthy subjects (22 men and 38 women, 54–88 years of age) who underwent cataract phacoemulsification. One month before and one month after surgery, three repetitions of scans were performed using the RNFL ...

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    14. Artificial Neural Network Techniques to Improve the Ability of Optical Coherence Tomography to Detect Optic Neuritis

      Artificial Neural Network Techniques to Improve the Ability of Optical Coherence Tomography to Detect Optic Neuritis

      Purpose : To analyze the ability of Spectralis optical coherence tomography (OCT) to detect multiple sclerosis (MS) and to distinguish MS eyes with antecedent optic neuritis (ON). To analyze the capability of artificial neural network (ANN) techniques to improve the diagnostic precision. Methods : MS patients and controls were enrolled ( n  = 217). OCT was used to determine the 768 retinal nerve fiber layer thicknesses. Sensitivity and specificity were evaluated to test the ability of OCT to discriminate between MS and healthy eyes, and between MS with and without antecedent ON using ANN. Results : Using ANN technique multilayer perceptrons, OCT could detect MS ...

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    15. Effect of cataract surgery on optical coherence tomography measurements and repeatability in patients with noninsulin-dependent diabetes mellitus

      Effect of cataract surgery on optical coherence tomography measurements and repeatability in patients with noninsulin-dependent diabetes mellitus

      Purpose: To evaluate the effect of uncomplicated cataract phacoemulsification on macular and retinal nerve fiber layer (RNFL) thickness using two spectral-domain optical coherence tomography (OCT) instruments, Cirrus OCT (Zeiss) and Spectralis OCT (Heidelberg), in patients having non-insulin dependent diabetes mellitus (NIDDM) without retinopathy, and to assess the reliability of the OCT measurements before and after cataract surgery. Methods: The study included 35 eyes of 35 patients having NIDDM without retinopathy (20 men and 15 women, mean age 69.8 years, range 48-80 years) who underwent cataract phacoemulsification. One month before and 1 month after surgery, visual acuity and three repetitions ...

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    16. Neuro-ophthalmologic evaluation, quality of life, and functional disability in patients with MS

      Neuro-ophthalmologic evaluation, quality of life, and functional disability in patients with MS

      OBJECTIVE: To evaluate correlations between longitudinal changes in neuro-ophthalmologic measures and quality of life (QOL) and disability in patients with multiple sclerosis (MS), using optical coherence tomography (OCT), visual evoked potentials (VEP), and visual field examination. METHODS: Fifty-four patients with relapsing-remitting MS were enrolled in this study and underwent Multiple Sclerosis Quality of Life questionnaire (54 items) (MSQOL-54) and Expanded Disability Status Scale (EDSS) evaluation, as well as complete neuro-ophthalmologic examination including visual field testing and retinal nerve fiber layer (RNFL) measurements using Cirrus and Spectralis OCT and VEP. All patients were re-evaluated at 12, 24, and 36 months. Logistical ...

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    17. Influence of Cataract Surgery on Optical Coherence Tomography and Neurophysiology Measurements in Patients With Retinitis Pigmentosa

      Influence of Cataract Surgery on Optical Coherence Tomography and Neurophysiology Measurements in Patients With Retinitis Pigmentosa

      Purpose To evaluate the effect of uncomplicated cataract phacoemulsification on the measurements of visual evoked potentials (VEP), pattern electroretinogram (PERG), and macular and retinal nerve fiber layer (RNFL) using 2 spectral-domain optical coherence tomography (OCT) instruments, the Cirrus OCT (Carl Zeiss Meditech) and Spectralis OCT (Heidelberg Engineering), in patients with retinitis pigmentosa (RP), and to assess the reliability of the OCT measurements before and after cataract surgery. Design Observational cross-sectional study. Methods Thirty-five eyes of 35 patients with RP (20 men and 15 women, 45-66 years) who underwent cataract phacoemulsification were studied. At 1 month before and 1 month after ...

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    18. Neural networks to identify multiple sclerosis with optical coherence tomography

      Neural networks to identify multiple sclerosis with optical coherence tomography

      Purpose: To compare axonal loss in ganglion cells detected with spectral-domain optical coherence tomography (OCT) in eyes of patients with multiple sclerosis (MS) versus healthy control subjects using an artificial neural network (ANN). To analyse the capability of the ANN technique to improve the detection of retinal nerve fibre layer (RNFL) damage in patients with multiple sclerosis. Methods: Patients with multiple sclerosis (n = 106) and age-matched healthy subjects (n = 115) were enrolled. The Spectralis OCT system was used to obtain the circumpapillary RNFL thickness in both eyes. The 768 RNFL thickness measurements provided by the Spectralis OCT were performed to ...

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    19. Reproducibility and Repeatability of Cirrus and Spectralis Fourier-Domain Optical Coherence Tomography of Healthy and Epiretinal Membrane Eyes

      Reproducibility and Repeatability of Cirrus and Spectralis Fourier-Domain Optical Coherence Tomography of Healthy and Epiretinal Membrane Eyes

      Purpose: To evaluate the accuracy and reproducibility of retinal thickness measurements in healthy and epiretinal membranes (ERM) eyes by Cirrus and Spectralis Fourier-domain optical coherence tomography devices. Methods: Eighty-seven ERM and 122 healthy subjects underwent 3 macular scans using both optical coherence tomography instruments. Mean thickness measurements in the nine Early Treatment Diabetic Retinopathy Study areas were compared, evaluating the repeatability and the relationship between devices. Results: Macular thickness increase was detected in ERM eyes for all optical coherence tomography parameters (P < 0.001). Mean foveal thickness was 423.5 +/- 81.4 and 438.0 +/- 54.2 [mu]m for ...

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    20. Ability and Reproducibility of Fourier-Domain Optical Coherence Tomography to Detect Retinal Nerve Fiber Layer Atrophy in Parkinson's Disease

      Ability and Reproducibility of Fourier-Domain Optical Coherence Tomography to Detect Retinal Nerve Fiber Layer Atrophy in Parkinson's Disease

      Purpose To evaluate and compare the ability of 3 protocols of Fourier-domain optical coherence tomography (OCT) to detect retinal thinning and retinal nerve fiber layer (RNFL) atrophy in patients with Parkinson's disease (PD) compared with healthy subjects. To test the intrasession reproducibility of RNFL thickness measurements in patients with PD and healthy subjects using the Cirrus (Carl Zeiss Meditec Inc., Dublin, CA) and Spectralis (Heidelberg Engineering, Inc., Heidelberg, Germany) OCT devices. Design Observational, cross-sectional study. Participants Patients with PD (n = 75) and age-matched healthy subjects (n = 75) were enrolled. Methods All subjects underwent three 360-degree circular scans centered on ...

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    21. Comparison of Retinal Nerve Fiber Layer Thickness Measurements in Healthy Subjects Using Fourier and Time Domain Optical Coherence Tomography

      Comparison of Retinal Nerve Fiber Layer Thickness Measurements in Healthy Subjects Using Fourier and Time Domain Optical Coherence Tomography

      Purpose. To compare the retinal nerve fiber layer (RNFL) measurements using two different ocular coherence tomography (OCT) devices: Cirrus Fourier domain OCT and Stratus time domain OCT. To analyze reproducibility of Fourier domain measurements in healthy subjects. Methods. One hundred and thirty-two eyes of 132 healthy subjects were scaned on the same day with both instruments, separated by 10 minutes from each other. Thickness of quadrant, average and the 12 different areas around the optic nerve were compared between Cirrus and Stratus. Repeatability, intraclass correlation coefficients (ICCs), and coefficients of variation (COVs) were calculated in RNFL measurements provided by Fourier ...

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    22. OPTICAL COHERENCE TOMOGRAPHY IN RETINITIS PIGMENTOSA: Reproducibility and Capacity to Detect Macular and Retinal Nerve Fiber Layer Thickness Alterations

      OPTICAL COHERENCE TOMOGRAPHY IN RETINITIS PIGMENTOSA: Reproducibility and Capacity to Detect Macular and Retinal Nerve Fiber Layer Thickness Alterations

      Purpose: To evaluate the ability of time-domain and Fourier-domain optical coherence tomographies (OCTs) to detect macular and retinal nerve fiber layer atrophies in retinitis pigmentosa (RP). To test the intrasession reproducibility using three OCT instruments (Stratus, Cirrus, and Spectralis). Methods: Eighty eyes of 80 subjects (40 RP patients and 40 healthy subjects) underwent a visual field examination, together with 3 macular scans and 3 optic disk evaluations by the same experienced examiner using 3 OCT instruments. Differences between healthy and RP eyes were compared. The relationship between measurements with each OCT instrument was evaluated. Repeatability was studied by intraclass correlation ...

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    23. Diagnostic Ability of a Linear Discriminant Function for Spectral-Domain Optical Coherence Tomography in Patients with Multiple Sclerosis

      Diagnostic Ability of a Linear Discriminant Function for Spectral-Domain Optical Coherence Tomography in Patients with Multiple Sclerosis

      Purpose To calculate and validate a linear discriminant function (LDF) for spectral-domain optical coherence tomography (OCT) to improve the diagnostic ability of retinal nerve fiber layer (RNFL) thickness parameters for the detection of multiple sclerosis (MS). Design Observational cross-sectional study. Participants Patients with multiple sclerosis (n = 115) and age-matched healthy subjects (n = 115) were enrolled in the study. Methods The Spectralis OCT system (Heidelberg Engineering, Heidelberg, Germany) was used to obtain the circumpapillary RNFL thickness in both eyes of each participant. Main Outcome Measures A validating set including 60% of the study subjects (69 healthy individuals and 69 patients with ...

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    1-24 of 27 1 2 »
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    Intra and interoperator reproducibility of retinal nerve fibre and macular thickness measurements using Cirrus Fourier-domain OCT Fourier-Domain OCT in multiple sclerosis patients: Reproducibility and ability to detect retinal nerve fiber layer atrophy Diagnostic Ability of a Linear Discriminant Function for Spectral-Domain Optical Coherence Tomography in Patients with Multiple Sclerosis OPTICAL COHERENCE TOMOGRAPHY IN RETINITIS PIGMENTOSA: Reproducibility and Capacity to Detect Macular and Retinal Nerve Fiber Layer Thickness Alterations Comparison of Retinal Nerve Fiber Layer Thickness Measurements in Healthy Subjects Using Fourier and Time Domain Optical Coherence Tomography Ability and Reproducibility of Fourier-Domain Optical Coherence Tomography to Detect Retinal Nerve Fiber Layer Atrophy in Parkinson's Disease Reproducibility and Repeatability of Cirrus and Spectralis Fourier-Domain Optical Coherence Tomography of Healthy and Epiretinal Membrane Eyes Neural networks to identify multiple sclerosis with optical coherence tomography Artificial Neural Network Techniques to Improve the Ability of Optical Coherence Tomography to Detect Optic Neuritis Image contrast correction method in full-field optical coherence tomography Evaluation of posterior vitreous detachment using ultrasonography and optical coherence tomography Optical coherence tomography angiography characteristics of acute retinal arterial occlusion