Method for finding the lateral position of the fovea in an sdoct image volume
AssigneeCarl Zeiss Meditec AG
InventorsPaul F. STETSON, Homayoun BAGHERINIA
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Abstract
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.
Claims25
A method of determining the location of the fovea within an image of an eye, said image being obtained with an optical coherence tomography (OCT) system, said OCT system including a light source generating a beam of light, a sample arm a reference arm and a detector for measuring light combined from the sample and reference arms, said method comprising the steps of:
- scanning the beam of light over a region of the eye;
- combining the light from the sample and reference arms;
- measuring the combined light to generate three dimensional image information;
- analyzing the image information to determine the location of the fovea within the image, said analyzing step being performed by evaluating a location dependent image quantity that reaches an extremum as the likelihood of that location being at or near the center of the fovea increases;
- and
- storing or displaying the determined foveal location.
A method of determining the location of the fovea within an image of an eye, said image being obtained with an optical coherence tomography (OCT) system, said OCT system including a light source generating a beam of light, a sample arm a reference arm and a detector for measuring light combined from the sample and reference arms, said method comprising the steps of:
- scanning the beam of light over a region of the eye;
- combining the light from the sample and reference arms;
- measuring the combined light to generate three dimensional image information;
- segmenting the image information to isolate a region wherein the integrated intensity of the image information within the region reaches a minimum as the likelihood of that location being at or near the center of the fovea increases, said integrated intensity information being computed as a function of intensity information over depth;
- analyzing the integrated intensity image information to determine the location where the intensity has reached a minimum;
- and
- storing or displaying the determined foveal location.
A method of determining the location of the fovea within an image of an eye, said image being obtained with an optical coherence tomography (OCT) system, said OCT system including a light source generating a beam of light, a sample arm a reference arm and a detector for measuring light combined from the sample and reference arms, said method comprising the steps of:
- scanning the beam of light over a region of the eye;
- combining the light from the sample and reference arms;
- measuring the combined light to generate three dimensional image information;
- analyzing the image information to determine the location of the fovea within the image, said analyzing step including evaluating a quantity associated with each of at least two different indicators of fovea location, said two different indicators being combined and weighted;
- and
- storing or displaying the determined foveal location.
Dependencies are inferred from the claim text.