Exact localization of breakpoints of Retinal pigment epithelium in Optical Coherence Tomography of Optic Nerve Head.

Automatic segmentation of retinal boundaries in Optical Coherence Tomography (OCT) acquired around Optic Nerve Head (ONH) is of high importance, due to anatomical structure of this area. Exclusion of this area from calculations is a prevalent method but for cases like calculation of disc margins, it is not applicable. The pro-posed method is designed for exact localization of Retinal pigment epithelium break points in ONH centered OCTs. The method is based on incorporation of ridgelet transform for determination of the ONH region and consequent identification of the end points. Incorrect localization in presence of shadow of retinal vessels has also been considered to obtain the high accuracy. Considering the mean value of disk diameter (145.07±38.96), the rational error of the algorithm is 0.07.