Patent application number | Description | Published |
20130188140 | SYSTEMS AND METHODS FOR ENHANCED ACCURACY IN OCT IMAGING OF THE CORNEA - Systems and methods for enhanced accuracy in optical coherence tomography imaging of the cornea are presented, including approaches for more accurate corneal surface modeling, pachymetry maps, keratometric values, and corneal power. These methods involve new scan patterns, an eye tracking mechanism for transverse motion feedback, and advanced motion correction algorithms. In one embodiment the methods comprise acquiring a first sparse set of data, using that data to create a corneal surface model, and then using the model to register a second set of denser data acquisition. This second set of data is used to create a more accurate, motion-corrected model of the cornea, from which pachymetry maps, keratometric values, and corneal power information can be generated. In addition, methods are presented for determining simulated keratometry values from optical coherence tomography data, and for better tracking and registration by using both rotation about three axes and the corneal apex. | 07-25-2013 |
20130208240 | SEGMENTATION AND ENHANCED VISUALIZATION TECHNIQUES FOR FULL-RANGE FOURIER DOMAIN OPTICAL COHERENCE TOMOGRAPHY - Presented here are new processing techniques for optical coherence tomography (OCT) data that allow for improved visualization and use of full-range OCT images. These techniques minimize the central line artifact and the complex conjugate artifact without requiring additional system hardware or significantly increasing post-processing time. The central line artifact is minimized by normalizing each A-scan to account for ripples at the zero-delay position. The complex conjugate artifact is minimized by segmentation of a layer or layers that cross the zero-delay position, and in some embodiments by further segmentation of other surfaces based on the segmentation of the initial layer or layers. The segmentation information is then used to selectively attenuate the complex conjugate image. It may also be used for other purposes, such as dewarping. | 08-15-2013 |
20130229621 | METHOD FOR FINDING THE LATERAL POSITION OF THE FOVEA IN AN SDOCT IMAGE VOLUME - Embodiments of the present invention provide methods for finding the lateral position of the fovea in an OCT image volume. In one instance, a cost function is developed whose minimum is located at or near the foveal center. This cost function includes one or more measures of retinal layer thickness and/or measures of distance from blood vessels or a priori locations. | 09-05-2013 |
20140029820 | DIFFERENTIAL GEOMETRIC METRICS CHARACTERIZING OPTICAL COHERENCE TOMOGRAPHY DATA - A method is disclosed for analyzing 3D image data generated from optical coherence tomography (OCT) systems. The first step in the method is to identify one or more surfaces within the 3D data set. The surfaces are then characterized using geometric primitives. Geometric primitives such as concavities, convexities, planar parts, saddles, and crevices can be used. In a preferred embodiment, the primitives are combined. Various pathological conditions of the eye can be evaluated based on any analysis of the primitives. | 01-30-2014 |
20140268039 | SYSTEMS AND METHODS FOR VARIABLE MODE OPTICAL COHERENCE TOMOGRAPHY IMAGING - Systems and methods for improvements to optical coherence tomography systems for operating in different imaging modes are presented. In one embodiment, a system for identifying the presence and type of an adjunct lens operably connected to the OCT instrument for changing between imaging modes in the system is described. In a second embodiment, a system for dynamically autofocusing the OCT system depending on the layer of interest is presented. In a third embodiment, the overall power of the system used for imaging can be adjusted depending on the location and type of scan desired while accounting for the safety standards for recommended light exposure. | 09-18-2014 |
20150062590 | EVALUATION OF OPTICAL COHERENCE TOMOGRAPHIC DATA PRIOR TO SEGMENTATION - An efficient method of evaluating the level of contrast of an OCT dataset is presented. The method develops a metric to segregate useful and not-so-useful data in one or more OCT B-scans, in order to reduce spurious subsequent analyses of the data by downstream segmentation algorithms. It is designed to be fast and efficient and is applied to determining autofocus of an OCT instrument real-time and in identifying a real image from its complex conjugate twin. | 03-05-2015 |
20150085294 | APPARATUS AND METHODS FOR DETECTING OPTICAL COMPONENTS AND THEIR MISALIGNMENT IN OPTICAL COHERENCE TOMOGRAPHIC SYSTEMS - Systems and methods are presented which allow the detection of the presence, type, and misalignment of optical components in the optical train of an optical coherence tomographic instrument to be determined from the use of OCT depth information. | 03-26-2015 |
20160038021 | SYSTEMS AND METHODS FOR ENHANCED ACCURACY IN OCT IMAGING OF THE CORNEA - Systems and methods for enhanced accuracy in optical coherence tomography imaging of the cornea are presented, including approaches for more accurate corneal surface modeling, pachymetry maps, keratometric values, and corneal power. These methods involve new scan patterns, an eye tracking mechanism for transverse motion feedback, and advanced motion correction algorithms. In one embodiment the methods comprise acquiring a first sparse set of data, using that data to create a corneal surface model, and then using the model to register a second set of denser data acquisition. This second set of data is used to create a more accurate, motion-corrected model of the cornea, from which pachymetry maps, keratometric values, and corneal power information can be generated. In addition, methods are presented for determining simulated keratometry values from optical coherence tomography data, and for better tracking and registration by using both rotation about three axes and the corneal apex. | 02-11-2016 |