title: Optical Coherence Tomography (OCT) Device Independent Intraretinal Layer Segmentation.
abstract: OBJECTIVE
  To develop and test an algorithm to segment intraretinal layers irrespectively of the actual Optical Coherence Tomography (OCT) device used.
  
  
  METHODS
  The developed algorithm is based on the graph theory optimization. The algorithm's performance was evaluated against that of three expert graders for unsigned boundary position difference and thickness measurement of a retinal layer group in 50 and 41 B-scans, respectively. Reproducibility of the algorithm was tested in 30 C-scans of 10 healthy subjects each with the Spectralis and the Stratus OCT. Comparability between different devices was evaluated in 84 C-scans (volume or radial scans) obtained from 21 healthy subjects, two scans per subject with the Spectralis OCT, and one scan per subject each with the Stratus OCT and the RTVue-100 OCT. Each C-scan was segmented and the mean thickness for each retinal layer in sections of the early treatment of diabetic retinopathy study (ETDRS) grid was measured.
  
  
  RESULTS
  The algorithm was able to segment up to 11 intraretinal layers. Measurements with the algorithm were within the 95% confidence interval of a single grader and the difference was smaller than the interindividual difference between the expert graders themselves. The cross-device examination of ETDRS-grid related layer thicknesses highly agreed between the three OCT devices. The algorithm correctly segmented a C-scan of a patient with X-linked retinitis pigmentosa.
  
  
  CONCLUSIONS
  The segmentation software provides device-independent, reliable, and reproducible analysis of intraretinal layers, similar to what is obtained from expert graders.
  
  
  CONCLUSIONS
  Potential application of the software includes routine clinical practice and multicenter clinical trials.
authors.affiliation: Department of Ophthalmology, Justus-Liebig-University, Giessen, Germany ; Department of Medical Informatics, University of Applied Sciences, Giessen, Germany.
authors.forename: Alexander
authors.initials: A
authors.lastname: Ehnes
authors.affiliation: Department of Ophthalmology, Justus-Liebig-University, Giessen, Germany ; Department of Ophthalmology, Phillips University, Marburg, Germany.
authors.forename: Yaroslava
authors.initials: Y
authors.lastname: Wenner
authors.affiliation: Department of Ophthalmology, Justus-Liebig-University, Giessen, Germany.
authors.forename: Christoph
authors.initials: C
authors.lastname: Friedburg
authors.affiliation: Department of Ophthalmology, Justus-Liebig-University, Giessen, Germany.
authors.forename: Markus N
authors.initials: MN
authors.lastname: Preising
authors.affiliation: Department of Ophthalmology, Justus-Liebig-University, Giessen, Germany.
authors.forename: Wadim
authors.initials: W
authors.lastname: Bowl
authors.affiliation: Department of Ophthalmology, Phillips University, Marburg, Germany.
authors.forename: Walter
authors.initials: W
authors.lastname: Sekundo
authors.affiliation: Department of Medical Informatics, University of Applied Sciences, Giessen, Germany.
authors.forename: Erdmuthe Meyer
authors.initials: EM
authors.lastname: Zu Bexten
authors.affiliation: Department of Ophthalmology, Justus-Liebig-University, Giessen, Germany.
authors.forename: Knut
authors.initials: K
authors.lastname: Stieger
authors.affiliation: Department of Ophthalmology, Justus-Liebig-University, Giessen, Germany.
authors.forename: Birgit
authors.initials: B
authors.lastname: Lorenz
keywords: graph theory optimization; optical coherence tomography; retina; retinal layer segmentation