METHOD FOR FINDING THE LATERAL POSITION OF THE FOVEA IN AN SDOCT IMAGE VOLUME
First Claim
1. 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.
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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.
77 Citations
25 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. 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:
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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. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. 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:
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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. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification