Computer-aided detection methods in volumetric imagery
First Claim
Patent Images
1. A method of detecting abnormalities in digital imagery comprising the steps of:
- providing a set of binary images derived from a plurality of slice images representing cross-sections through a body;
performing a first spherical summation operation as a function of voxel locations in said set of images over a spherical region of a first radius to provide a first spherical summation value;
performing a second spherical summation operation as a function of said voxel locations in said set of images over a spherical region of a second radius to provide a second spherical summation value;
computing a ratio of said first spherical summation value to said second spherical summation value; and
comparing said ratio to a threshold value and creating a set of detection images by turning voxels ON which exceed said threshold value.
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Abstract
This invention provides a method for detecting abnormalities in medical images, particularly for the detection of polyps in the colon from computed tomography imagery. Specifically a set of colon masks is input to a detector where summations over spherical volumes with two different radii are computed. Abnormalities are detected based on the ratio of spherical summation values computed for every pixel location.
55 Citations
20 Claims
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1. A method of detecting abnormalities in digital imagery comprising the steps of:
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providing a set of binary images derived from a plurality of slice images representing cross-sections through a body; performing a first spherical summation operation as a function of voxel locations in said set of images over a spherical region of a first radius to provide a first spherical summation value; performing a second spherical summation operation as a function of said voxel locations in said set of images over a spherical region of a second radius to provide a second spherical summation value; computing a ratio of said first spherical summation value to said second spherical summation value; and comparing said ratio to a threshold value and creating a set of detection images by turning voxels ON which exceed said threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system of detecting abnormalities in digital imagery, the system comprising:
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a set of binary images derived from a plurality of slice images representing cross-sections through a body; a detector, wherein said detector performs a first spherical summation operation as a function of voxel locations in said set of images over a spherical region of a first radius to provide a first spherical summation value, performs a second spherical summation operation as a function of said voxel locations in said set of images over a spherical region of a second radius to provide a second spherical summation value, computes a ratio of said first spherical summation value to said second spherical summation value, compares said ratio to a threshold value and creates a set of detection images by turning voxels ON which exceed said threshold value. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification