title: Quantitative analysis of retinal layer optical intensities on three-dimensional optical coherence tomography.
abstract: OBJECTIVE
  To investigate the optical intensities of all retinal layers on three-dimensional (3D) spectral-domain optical coherence tomography (SD-OCT) in normal subjects using an automatic measurement.
  
  
  METHODS
  Forty normal subjects underwent Topcon 3D OCT-1000 macula-centered scan. The raw data were automatically segmented into 10 layers using the 3D graph search approach. Then the mean and standard deviation of intensities of each layer were calculated. The image quality index was given by the OCT software. Correlation analysis was performed between the optical intensities in each layer and image quality and subject's age.
  
  
  RESULTS
  The correlation of optical intensities was strong from ganglion cell layer (GCL) to outer nuclear layer (ONL) with r > 0.934; moderate among retinal nerve fiber layer (RNFL), photoreceptor, retinal pigment epithelium (RPE), and choroid (0.410 < r < 0.800); and low in the vitreous (0.251 < r < 0.541). The optical intensities were also correlated with the image quality, r > 0.869 from GCL to ONL, 0.748 < r < 0.802 for RNFL, photoreceptor layer, RPE, and the choroid, r = 0.528 for the vitreous. The optical intensity in RNFL was negatively correlated with age (r = -0.365).
  
  
  CONCLUSIONS
  Automatic assessment of the layers' intensities was achieved. In normal subjects, the retinal layers' optical intensities were affected by image quality. Normalization with optical intensity of ONL, all areas, or image quality index is recommended. The optical intensity of RNFL decreased with age.
authors.affiliation: School of Electronics and Information Engineering, Soochow University, Suzhou, China.
authors.forename: Xinjian
authors.initials: X
authors.lastname: Chen
authors.forename: Ping
authors.initials: P
authors.lastname: Hou
authors.forename: Chao
authors.initials: C
authors.lastname: Jin
authors.forename: Weifang
authors.initials: W
authors.lastname: Zhu
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Luo
authors.forename: Fei
authors.initials: F
authors.lastname: Shi
authors.forename: Milan
authors.initials: M
authors.lastname: Sonka
authors.forename: Haoyu
authors.initials: H
authors.lastname: Chen
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000375:Aging / Q000502:physiology; D000704:Analysis of Variance; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012160:Retina / Q000033:anatomy & histology* / Q000502:physiology; D055351:Retinal Neurons / Q000502:physiology; D012737:Sex Factors; D041623:Tomography, Optical Coherence / Q000295:instrumentation / Q000379:methods*; D055815:Young Adult
keywords: image analysis; macula; optical coherence tomography; optical intensity
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