Segmentation of magnetic resonance imaging data
First Claim
Patent Images
1. A computer-implemented method for segmenting magnetic resonance imaging (MRI) data, the method comprising:
- detecting one or more edges in an image for a given bone structure;
determining an initial position on the image;
converting the initial position into an initial contour within the given bone structure; and
iteratively deforming the initial contour to expand into a shape matching the given bone structure by dynamically applying a set of constraints locally to each point along the initial contour for causing each point to evolve towards at least a selected one of the one or more edges, and updating the set of constraints after one or more iterations, wherein the set of constraints includes curvature and continuity constraints, and wherein iteratively deforming the initial contour comprises computing a distance from each point along the initial contour to a nearest one of the one or more edges present in the image and dynamically determining from the computed distance the curvature and continuity constraints to be applied at the point.
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Abstract
There is described herein an image segmentation technique using an iterative process. A contour, which begins with a single point that expands into a hollow shape, is iteratively deformed into a defined structure. As the contour is deformed, various constraints are applied to points along the contour to dictate its rate of change and direction of change are modified dynamically. The constraints may be modified after one or more iterations, at each point along the contour, in accordance with newly measured or determined data.
34 Citations
19 Claims
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1. A computer-implemented method for segmenting magnetic resonance imaging (MRI) data, the method comprising:
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detecting one or more edges in an image for a given bone structure; determining an initial position on the image; converting the initial position into an initial contour within the given bone structure; and iteratively deforming the initial contour to expand into a shape matching the given bone structure by dynamically applying a set of constraints locally to each point along the initial contour for causing each point to evolve towards at least a selected one of the one or more edges, and updating the set of constraints after one or more iterations, wherein the set of constraints includes curvature and continuity constraints, and wherein iteratively deforming the initial contour comprises computing a distance from each point along the initial contour to a nearest one of the one or more edges present in the image and dynamically determining from the computed distance the curvature and continuity constraints to be applied at the point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for generating segmented data from magnetic resonance imaging (MRI) data, the system comprising:
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at least one computer server communicable with at least one computing device over a network, the at least one computer server having a processor and a memory; an initial position module stored on the memory and executable by the processor, the initial position module having program code that when executed, determines an initial position on an image for a given bone structure and converting the initial position into an initial contour; and a contour definition module stored on the memory and executable by the processor, the contour definition module having program code that when executed, iteratively deforms the initial contour to expand into a shape matching the given bone structure by dynamically applying a set of constraints locally to each point along the initial contour for causing each point to evolve towards at least a selected one of one or more edges present in the image, and updating the set of constraints after one or more iterations, wherein the set of constraints includes curvature and continuity constraints, and wherein iteratively deforming the initial contour comprises computing a distance from each point along the initial contour to a nearest one of the one or more edges present in the image and dynamically determining from the computed distance the curvature and continuity constraints to be applied at the point. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A non-transitory computer readable medium having stored thereon program code executable by a processor for generating segmented data from magnetic resonance imaging (MRI) data, the program code executable for:
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determining an initial position on an image for a given bone structure; converting the initial position into an initial contour within the given bone structure; and iteratively deforming the initial contour to expand into a shape matching the given bone structure by dynamically applying a set of constraints locally to each point along the initial contour for causing each point to evolve towards at least a selected one of one or more edges present in the image, and updating the set of constraints after one or more iterations, wherein the set of constraints includes curvature and continuity constraints, and wherein iteratively deforming the initial contour comprises computing a distance from each point along the initial contour to a nearest one of the one or more edges present in the image and dynamically determining from the computed distance the curvature and continuity constraints to be applied at the point.
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Specification