3 March 2017 Inferring diagnosis and trajectory of wet age-related macular degeneration from OCT imagery of retina
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Abstract
Quantitative biomarkers for assessing the presence, severity, and progression of age-related macular degeneration (AMD) would benefit research, diagnosis, and treatment. This paper explores development of quantitative biomarkers derived from OCT imagery of the retina. OCT images for approximately 75 patients with Wet AMD, Dry AMD, and no AMD (healthy eyes) were analyzed to identify image features indicative of the patients’ conditions. OCT image features provide a statistical characterization of the retina. Healthy eyes exhibit a layered structure, whereas chaotic patterns indicate the deterioration associated with AMD. Our approach uses wavelet and Frangi filtering, combined with statistical features that do not rely on image segmentation, to assess patient conditions. Classification analysis indicates clear separability of Wet AMD from other conditions, including Dry AMD and healthy retinas. The probability of correct classification of was 95.7%, as determined from cross validation. Similar classification analysis predicts the response of Wet AMD patients to treatment, as measured by the Best Corrected Visual Acuity (BCVA). A statistical model predicts BCVA from the imagery features with R2 = 0.846. Initial analysis of OCT imagery indicates that imagery-derived features can provide useful biomarkers for characterization and quantification of AMD: Accurate assessment of Wet AMD compared to other conditions; image-based prediction of outcome for Wet AMD treatment; and features derived from the OCT imagery accurately predict BCVA; unlike many methods in the literature, our techniques do not rely on segmentation of the OCT image. Next steps include larger scale testing and validation.
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John M. Irvine, John M. Irvine, Nastaran Ghadar, Nastaran Ghadar, Steve Duncan, Steve Duncan, David Floyd, David Floyd, David O'Dowd, David O'Dowd, Kristie Lin, Kristie Lin, Tom Chang, Tom Chang, } "Inferring diagnosis and trajectory of wet age-related macular degeneration from OCT imagery of retina", Proc. SPIE 10134, Medical Imaging 2017: Computer-Aided Diagnosis, 1013439 (3 March 2017); doi: 10.1117/12.2254607; https://doi.org/10.1117/12.2254607
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