Detailed Retinal Thickness Mapping Using the Stratus OCT

Abstract

Abstract: : Purpose: To improve lateral resolution of retinal thickness maps using the new Stratus OCT (Optical Coherence Tomography). Methods:Data is exported from the Stratus OCT software that includes the fundus image with the projected line scan shown over the fundus image ("vil" file) and both the original raw data ("raw" file) and measures of the retinal thickness ("rth" file). A data driven process allows for the registration of the several scans brought into the thickness map and takes into account eventual saccadic eye movements. The user establishes the number, position, orientation and length (line scans) or radius (circle scans) necessary to the map according to the needs. The procedure is fully automatic. Results:The new retinal thickness maps present an increased resolution when compared to the original ones, thus allowing for a detailed mapping of the posterior pole by allowing any number of either line or circle line scans to be mixed in the same map, at any position, length and orientation or radius, for line or circle scans, respectively. The increased resolution of the thickness maps allows for a better definition of edematous areas and thus allows for a better follow–up by measuring the volume of edema and/or cysts. Conclusions: This new method for retinal thickness mapping using the Stratus OCT, offers more detailed mapping of the retinal edema and reliable measurements of the volume changes in the edema or cysts.

Keywords: imaging methods (CT, FA, ICG, MRI, OCT, RTA, SLO, ultrasound) • imaging/image analysis: non–clinical • retina