Computer Vision News - February 2017

Every month, Computer Vision News reviews a successful project. Our main purpose is to show how diverse image processing applications can be and how the different techniques can contribute to solving technical challenges and physical difficulties. This month we review RSIP Vision ’s automated algorithm able to perform accurate retina thickness measurement , which is used by ophthalmologists to assess ocular degeneration. RSIP Vision’s engineers can assist you in countless application fields. Contact our consultants now! Thickness of the retina is a prognostic factor in determining ocular degeneration as well as disease development and progression. Usually, exceeding thickness of the retina is caused by edema or cyst that harms vision up to blindness. Retinal thickness is routinely examined by Optical Coherence Tomography (OCT) B-scan slices. OCT is an imaging modality that reached wide popularity during the past 25 years. The measurement is performed between the Inner Limiting Membrane (ILM - top yellow line in the picture above) and the Retinal Pigment Epithelium (RPE - bottom green line). To help physicians track degeneration progression and initiation, tables of retinal thickness have been devised over the years. In practice, the most common grid table is the ETDRS grid , (see the figure at the right), a circular table divided into 2 concentric rings, each divided into 4 regions of equal area. The chart regions correspond to regions of the eye, with the center corresponding to the fovea (the central subfield, typically 1000 micrometer in diameter). Using this table, physicians can determine the extent of thickness and curvature deviation from normality in various parts of the retina. Resorting to charts post measurement is a time consuming task and prone to human errors. RSIP Vision has constructed an automated algorithm to measure the thickness of the retina in each of the 9 subfields of the retina defined by the ETDRS grid. This automated procedure allows for measuring eye health and provide indications during or immediately after the scan is performed. Project 20 Computer Vision News Project Retina Thickness Measurement A non-invasive, accurate and efficient method of assessing retinal health