System and method for fused PET-CT visualization for heart unfolding
First Claim
1. A method of fusing two digitized image datasets for 2-dimensional visualization of the heart, comprising the steps of:
- providing a first digitized image and a second digitized image, each image acquired from a different imaging modality and each comprising a plurality of intensities corresponding to a domain of points on a 3-dimensional grid, and wherein the first and second images have been registered;
segmenting the heart in one of said digitized images, wherein the heart segmentation identifies the surface of the heart;
forming a distance map that associates with each point in said heart a distance from said point to the surface of the heart;
using said distance map to model the heart surface by a 3-dimensional ellipsoid, wherein said 3-dimensional ellipsoid is a bi-axial ellipsoid wherein a center is computed as a center of gravity G of all points located on a distance map isosurface of distance 0, a major axis Z is a vector {right arrow over (G)}M, where M is a point on said isosurface maximizing the length |{right arrow over (G)}M|, a minor axis X is a vector {right arrow over (G)}N, where N is a point on said isosurface minimizing the length |{right arrow over (G)}N|, and a third axis Y orthogonal to said axes Z and X;
forming a 2-dimensional maximum intensity projection of a surface of said heart from each of said digitized images; and
fusing said images by overlaying one 2-dimensional projection of said surface over the other 2-dimensional projection of said surface.
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Abstract
A method for fusing two digitized image datasets for 2-dimensional visualization of the heart, includes providing a first digitized image and a second digitized image, each image acquired from a different imaging modality and each comprising a plurality of intensities corresponding to a domain of points on a 3-dimensional grid, and wherein the first and second images have been registered, segmenting the heart in one of said digitized images, forming a 2-dimensional maximum intensity projection of a surface of said heart from each of said digitized images, and fusing said images by overlaying one 2-dimensional projection of said surface over the other 2-dimensional projection of said surface.
27 Citations
14 Claims
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1. A method of fusing two digitized image datasets for 2-dimensional visualization of the heart, comprising the steps of:
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providing a first digitized image and a second digitized image, each image acquired from a different imaging modality and each comprising a plurality of intensities corresponding to a domain of points on a 3-dimensional grid, and wherein the first and second images have been registered; segmenting the heart in one of said digitized images, wherein the heart segmentation identifies the surface of the heart; forming a distance map that associates with each point in said heart a distance from said point to the surface of the heart; using said distance map to model the heart surface by a 3-dimensional ellipsoid, wherein said 3-dimensional ellipsoid is a bi-axial ellipsoid wherein a center is computed as a center of gravity G of all points located on a distance map isosurface of distance 0, a major axis Z is a vector {right arrow over (G)}M, where M is a point on said isosurface maximizing the length |{right arrow over (G)}M|, a minor axis X is a vector {right arrow over (G)}N, where N is a point on said isosurface minimizing the length |{right arrow over (G)}N|, and a third axis Y orthogonal to said axes Z and X; forming a 2-dimensional maximum intensity projection of a surface of said heart from each of said digitized images; and fusing said images by overlaying one 2-dimensional projection of said surface over the other 2-dimensional projection of said surface. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of fusing two digitized image datasets for 2-dimensional visualization of the heart, comprising the steps of:
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providing a digitized computed tomography (CT) image and a digitized positron emission tomography (PET) image, each image comprising a plurality of intensities corresponding to a domain of points on a 3-dimensional grid; segmenting the heart surface in said CT image; modeling the heart surface with a 3-dimensional ellipsoid and forming a 2-dimensional maximum intensity projection of said heart surface from each of said digitized images, wherein forming a 2-dimensional projection of said heart surface from said CT image comprises casting rays from said ellipsoid into said heart to form a 2-dimensional projection of said heart surface, wherein an intensity of a point I(X)=I(u,v) on said 2D projection is a normalized sum of each intensity, In along the ray - View Dependent Claims (8, 9)
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10. A program storage device readable by a computer, tangibly embodying a program of instructions executable by the computer to perform the method steps for fusing two digitized image datasets for 2-dimensional visualization of the heart, the method comprising the steps of:
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providing a first digitized image and a second digitized image, each image acquired from a different imaging modality and each comprising a plurality of intensities corresponding to a domain of points on a 3-dimensional grid, and wherein the first and second images have been registered; segmenting the heart in one of said digitized images, wherein the heart segmentation identifies the surface of the heart; forming a distance map that associates with each point in said heart a distance from said point to the surface of the heart; using said distance map to model the heart surface by a 3-dimensional ellipsoid; using a transverse Mercator projection for forming said 2-dimensional maximum intensity projection of said heart surface from said ellipsoid for each of said digitized images; and fusing said images by overlaying one 2-dimensional projection of said surface over the other 2-dimensional projection of said surface. - View Dependent Claims (11, 12, 13, 14)
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Specification