School of Medicine and Health Sciences Poster Presentations
Poster Number
193
Document Type
Poster
Publication Date
3-2016
Abstract
Purpose: To determine the influence of volume averaging on retinal layer thickness measures acquired with spectral-domain optical coherence tomography (SD-OCT) in children.
Methods: Macular SD-OCT images were acquired using three different volume acquisition settings (i.e., ART 1, 3, and 9 volumes) in children enrolled in a prospective OCT study. Total retinal, retinal nerve fiber layer, ganglion cell layer, inner plexiform layer, inner nuclear layer, and outer plexiform layer thicknesses were measured around an ETDRS grid using beta version automated segmentation software for the Spectralis. The magnitude of manual segmentation required to correct the automated segmentation was classified as either minor (less than 12 lines adjusted), moderate (>12 andadjusted), severe (>26 and < 48 lines adjusted) or fail (> 48 lines adjusted or could not adjust due to poor image quality). The frequency of each edit classification was assessed for each volume setting. Thickness, paired difference and 95% limits of agreement of each anatomic quadrant were compared across volumes.
Results: 75 subjects (median age 11.8 years, range 4.3- 18.5 years) contributed 75 eyes. Less than 5% of the 9 and 3 volume scans required more than minor manual segmentation corrections, compared to 71% of 1 volume scans. The inner (3mm) region demonstrated similar measures across all layers, regardless of volume number. The one volume scans demonstrated greater variability of the RNFL thickness, compared to the other volumes in the outer (6mm) region.
Discussion: In children, a minimum acquisition setting of ART 3 for SD-OCT volumes should be obtained to reduce retinal layer segmentation errors.
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Open Access
1
Included in
Analytical, Diagnostic and Therapeutic Techniques and Equipment Commons, Medical Neurobiology Commons, Neurology Commons
Volume Averaging of Spectral-Domain Optical Coherence Tomography Impacts Retinal Segmentation in Children
Purpose: To determine the influence of volume averaging on retinal layer thickness measures acquired with spectral-domain optical coherence tomography (SD-OCT) in children.
Methods: Macular SD-OCT images were acquired using three different volume acquisition settings (i.e., ART 1, 3, and 9 volumes) in children enrolled in a prospective OCT study. Total retinal, retinal nerve fiber layer, ganglion cell layer, inner plexiform layer, inner nuclear layer, and outer plexiform layer thicknesses were measured around an ETDRS grid using beta version automated segmentation software for the Spectralis. The magnitude of manual segmentation required to correct the automated segmentation was classified as either minor (less than 12 lines adjusted), moderate (>12 andadjusted), severe (>26 and < 48 lines adjusted) or fail (> 48 lines adjusted or could not adjust due to poor image quality). The frequency of each edit classification was assessed for each volume setting. Thickness, paired difference and 95% limits of agreement of each anatomic quadrant were compared across volumes.
Results: 75 subjects (median age 11.8 years, range 4.3- 18.5 years) contributed 75 eyes. Less than 5% of the 9 and 3 volume scans required more than minor manual segmentation corrections, compared to 71% of 1 volume scans. The inner (3mm) region demonstrated similar measures across all layers, regardless of volume number. The one volume scans demonstrated greater variability of the RNFL thickness, compared to the other volumes in the outer (6mm) region.
Discussion: In children, a minimum acquisition setting of ART 3 for SD-OCT volumes should be obtained to reduce retinal layer segmentation errors.
Comments
Presented at: GW Research Days 2016