Intraretinal segmentation on fourier domain optical coherence tomography

ABSTRACT

<p><b>INTRODUCTION</b>We studied the automated intraretinal segmentation on Fourier domain optical coherence tomography (OCT).</p><p><b>MATERIALS AND METHODS</b>Thirty eyes from 30 normal subjects were studied using the RTVue-100. Both radial and raster scan protocol were performed 3 times on each subject. The OCT software performs automated intraretinal segmentation and provides macular thickness measurements.</p><p><b>RESULTS</b>Both scanning protocols provide reproducible inner, outer and full retinal thickness measurements. The inner, outer and full retinal thicknesses at the foveal central subfield were 67.31 +/- 12.27 microm, 151.67 +/- 12.96 microm, 219.33 +/- 23.19 microm, respectively by the raster scan, and 63.27 +/- 10.37 microm, 147.07 +/- 14.54 microm, 209.89 +/- 21.80 microm, respectively by the radial scan. Macular regional variations were consistently observed. The raster scan protocol gives greater retinal thickness measurements than the radial scan protocol (P <0.05), but the latter yields slightly more reproducible results.</p><p><b>CONCLUSIONS</b>Fourier domain OCT equipped with the ability to perform automatic intraretinal segmentation is a convenient tool in studying diseases that may differentially affect various parts of the retina. However, the establishment of normative values can be complicated by different scanning protocols, devices used, methods of data presentation and definition of intraretinal boundaries.</p>