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 segmenting the image information and assigning values across the image, said values corresponding to the integrated intensity as a function of depth, said segmenting being selected so that the integrated intensity 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.
65 Citations
21 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 segmenting the image information and assigning values across the image, said values corresponding to the integrated intensity as a function of depth, said segmenting being selected so that the integrated intensity 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)
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10. 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 (11, 12, 13, 14, 15, 16)
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17. 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 independent indicators of fovea location, said two different indicators being combined and weighted, wherein one of said indicators of foveal location relates to the level of integrated intensity across the image, said integrated intensity being measured as a function of depth; and storing or displaying the determined foveal location. - View Dependent Claims (18, 19, 20, 21)
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Specification