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Thickness Mapping of Eleven Retinal Layers Segmented Using the Diffusion Maps Method in Normal Eyes Publisher



Kafieh R1, 2 ; Rabbani H1, 3 ; Hajizadeh F4 ; Abramoff MD5, 6 ; Sonka M3, 7
Authors
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Authors Affiliations
  1. 1. Biomedical Engineering Department, Medical Image and Signal Processing Research Center, Isfahan University of Medical Sciences, Isfahan, 81745, Iran
  2. 2. Faculty of Engineering and Natural Sciences, Sabanci University, Istanbul, 34956, Turkey
  3. 3. Iowa Institute for Biomedical Imaging, University of Iowa, Iowa City, 52242, IA, United States
  4. 4. Noor Ophthalmology Research Center, Tehran, 1968653111, Iran
  5. 5. Department of Ophthalmology and Visual Science, University of Iowa, Iowa City, 52242, IA, United States
  6. 6. VA Medical Center, Iowa City, 52246, IA, United States
  7. 7. Department of Electrical and Computer Engineering, University of Iowa, Iowa City, 52242, IA, United States

Source: Journal of Ophthalmology Published:2015


Abstract

This study was conducted to determine the thickness map of eleven retinal layers in normal subjects by spectral domain optical coherence tomography (SD-OCT) and evaluate their association with sex and age. Mean regional retinal thickness of 11 retinal layers was obtained by automatic three-dimensional diffusion map based method in 112 normal eyes of 76 Iranian subjects. We applied our previously reported 3D intraretinal fast layer segmentation which does not require edge-based image information but rather relies on regional image texture. The thickness maps are compared among 9 macular sectors within 3 concentric circles as defined by ETDRS. The thickness map of central foveal area in layers 1, 3, and 4 displayed the minimum thickness. Maximum thickness was observed in nasal to the fovea of layer 1 and in a circular pattern in the parafoveal retinal area of layers 2, 3, and 4 and in central foveal area of layer 6. Temporal and inferior quadrants of the total retinal thickness and most of other quadrants of layer 1 were significantly greater in the men than in the women. Surrounding eight sectors of total retinal thickness and a limited number of sectors in layers 1 and 4 significantly correlated with age. © 2015 Raheleh Kafieh et al.
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