E Garcia-Martin1, M Ortiz2, L Boquete3, E M Sánchez-Morla4, R Barea5, C Cavaliere5, E Vilades6, E Orduna6, M J Rodrigo7. 1. Department of Ophthalmology, Miguel Servet University Hospital, Zaragoza, Spain; Aragon Institute for Health Research (IIS Aragon). Miguel Servet Ophthalmology Innovation and Research Group (GIMSO), University of Zaragoza, Spain; RETICS: Thematic Networks for Co-operative Research in Health for Ocular Diseases, Spain. 2. School of Physics, University of Melbourne, VIC, 3010, Australia. 3. RETICS: Thematic Networks for Co-operative Research in Health for Ocular Diseases, Spain; Biomedical Engineering Group, Department of Electronics, University of Alcalá, Alcalá de Henares, Spain. 4. Department of Psychiatry, Hospital 12 de Octubre Research Institute (i+12), 28041, Madrid, Spain; Faculty of Medicine, Complutense University of Madrid, 28040, Madrid, Spain; CIBERSAM: Biomedical Research Networking Centre in Mental Health, 28029, Madrid, Spain. 5. Biomedical Engineering Group, Department of Electronics, University of Alcalá, Alcalá de Henares, Spain. 6. Department of Ophthalmology, Miguel Servet University Hospital, Zaragoza, Spain; Aragon Institute for Health Research (IIS Aragon). Miguel Servet Ophthalmology Innovation and Research Group (GIMSO), University of Zaragoza, Spain. 7. Department of Ophthalmology, Miguel Servet University Hospital, Zaragoza, Spain; Aragon Institute for Health Research (IIS Aragon). Miguel Servet Ophthalmology Innovation and Research Group (GIMSO), University of Zaragoza, Spain; RETICS: Thematic Networks for Co-operative Research in Health for Ocular Diseases, Spain. Electronic address: mariajesusrodrigo@hotmail.es.
Abstract
BACKGROUND: The consequences of inflammation, demyelination, axonal degeneration and neuronal loss in the central nervous system, typical of the development of multiple sclerosis (MS), are manifested in thinning of the retina and optic nerve. The purpose of this work is to diagnose early-stage MS patients based on analysis of retinal layer thickness obtained by swept-source optical coherence tomography (SS-OCT). METHOD: OCT (Triton® SS-OCT device -Topcon, Tokyo, Japan-) recordings were obtained from 48 control subjects and 48 recently diagnosed MS patients. The following thicknesses were measured on a 45 × 60 grid: retinal nerve fibre layer (RNFL), ganglion cell layer (GCL+), GCL++, retinal thickness and choroid. Using Cohen's d effect size, it was determined the regions and layers with greatest capacity to discriminate between control subjects and patients. Points exceeding the threshold set were used as inputs for an automatic classifier: support vector machine and feed-forward neural network. RESULTS: In MS at clinical onset the layer with greatest discriminant capacity is GCL++ [AUC = 0.83] which exhibits a horseshoe-like macular topographic distribution. It is followed by retina, GCL+ and RNFL; choroidal thicknesses do not provide discriminatory capacity. Using a neural network as a classifier between controls and MS patients, obtains sensitivity of 0.98 and specificity of 0.98. CONCLUSIONS: This work suggest that OCT may serve as an important complementary role to other clinical tests, particularly regarding neurodegeneration. It is possible to characterise structural alterations in retina and diagnose early-stage MS with high degree of accuracy using OCT and artificial neural networks.
BACKGROUND: The consequences of inflammation, demyelination, axonal degeneration and neuronal loss in the central nervous system, typical of the development of multiple sclerosis (MS), are manifested in thinning of the retina and optic nerve. The purpose of this work is to diagnose early-stage MS patients based on analysis of retinal layer thickness obtained by swept-source optical coherence tomography (SS-OCT). METHOD:OCT (Triton® SS-OCT device -Topcon, Tokyo, Japan-) recordings were obtained from 48 control subjects and 48 recently diagnosed MS patients. The following thicknesses were measured on a 45 × 60 grid: retinal nerve fibre layer (RNFL), ganglion cell layer (GCL+), GCL++, retinal thickness and choroid. Using Cohen's d effect size, it was determined the regions and layers with greatest capacity to discriminate between control subjects and patients. Points exceeding the threshold set were used as inputs for an automatic classifier: support vector machine and feed-forward neural network. RESULTS: In MS at clinical onset the layer with greatest discriminant capacity is GCL++ [AUC = 0.83] which exhibits a horseshoe-like macular topographic distribution. It is followed by retina, GCL+ and RNFL; choroidal thicknesses do not provide discriminatory capacity. Using a neural network as a classifier between controls and MS patients, obtains sensitivity of 0.98 and specificity of 0.98. CONCLUSIONS: This work suggest that OCT may serve as an important complementary role to other clinical tests, particularly regarding neurodegeneration. It is possible to characterise structural alterations in retina and diagnose early-stage MS with high degree of accuracy using OCT and artificial neural networks.
Authors: Almudena López-Dorado; Miguel Ortiz; María Satue; María J Rodrigo; Rafael Barea; Eva M Sánchez-Morla; Carlo Cavaliere; José M Rodríguez-Ascariz; Elvira Orduna-Hospital; Luciano Boquete; Elena Garcia-Martin Journal: Sensors (Basel) Date: 2021-12-27 Impact factor: 3.576