Methods and systems for segmentation using boundary reparameterization
First Claim
Patent Images
1. A computer-implemented method of generating a segmented image of an anatomical structure, the method comprising:
- a) providing, from a register to a mapping module, an initial boundary estimate of the anatomical structure;
b) determining, by the mapping module, a boundary band region that includes the initial boundary estimate of the anatomical structure by sampling image data along a series of lines normal to the initial border estimate;
c) converting the boundary band region to a rectangular boundary image and the boundary estimate to a curve within the rectangular boundary image such that the boundary estimate is defined relative to a coordinate grid of the rectangular boundary image;
d) using a processor, (i) segmenting the boundary estimate within the rectangular boundary image and (ii) mapping the segmented boundary estimate from the rectangular boundary image onto the boundary band region to obtain a segmented boundary estimate;
e) repeating steps b) through d) using the segmented boundary estimate from the rectangular boundary image as the initial boundary estimate within an updated boundary band, until the tolerance difference is below a threshold; and
(f) generating, using the processor, an improved segmented image of the anatomical structure from the segmented boundary estimate.
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Abstract
Representations of a segmented, contoured organ or lesion are obtained from two-dimensional or three-dimensional images. A contour within the image of the lesion or organ of interest is used to identify a region around the initial contour and transform it into a boundary image comprising sampling lines that contain points identifying the organ boundary.
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Citations
28 Claims
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1. A computer-implemented method of generating a segmented image of an anatomical structure, the method comprising:
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a) providing, from a register to a mapping module, an initial boundary estimate of the anatomical structure; b) determining, by the mapping module, a boundary band region that includes the initial boundary estimate of the anatomical structure by sampling image data along a series of lines normal to the initial border estimate; c) converting the boundary band region to a rectangular boundary image and the boundary estimate to a curve within the rectangular boundary image such that the boundary estimate is defined relative to a coordinate grid of the rectangular boundary image; d) using a processor, (i) segmenting the boundary estimate within the rectangular boundary image and (ii) mapping the segmented boundary estimate from the rectangular boundary image onto the boundary band region to obtain a segmented boundary estimate; e) repeating steps b) through d) using the segmented boundary estimate from the rectangular boundary image as the initial boundary estimate within an updated boundary band, until the tolerance difference is below a threshold; and (f) generating, using the processor, an improved segmented image of the anatomical structure from the segmented boundary estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A system for generating a segmented image of an anatomical structure, the system comprising:
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a) a register for receiving an image and an initial boundary estimate of an anatomical structure represented in the image; and b) a mapping module for; i) determining a boundary band region that includes the initial boundary estimate of the anatomical structure by sampling image data along a series of lines normal to the initial border estimate; and ii) converting the boundary band region to a rectangular boundary image and the boundary estimate to a curve within the rectangular boundary image such that the boundary estimate is defined relative to a coordinate grid of the boundary image; and c) a processor for; ii) segmenting the boundary estimate within the rectangular boundary image; iii) mapping the segmented boundary estimate from the rectangular boundary image onto the boundary band region to obtain a segmented boundary estimate; and iv) generating a segmented image of the anatomical structure from the segmented boundary estimate; wherein the mapping module and processor iteratively segment and map the segmented boundary band using the new boundary estimate generated based on the rectangular boundary image as the initial boundary estimate within the boundary band. - View Dependent Claims (27)
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28. An article of manufacture having computer-readable program portions embodied thereon for segmenting representations of an anatomical structure in an image, the article comprising non-transitory computer-readable instructions for:
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a) providing an initial boundary estimate of the anatomical structure; b) determining a boundary band that includes the initial boundary estimate of the anatomical structure by sampling image data along a series of lines normal to the initial border estimate; c) converting the boundary band region to a rectangular boundary image and the boundary estimate to a curve within the rectangular boundary image such that the boundary estimate is defined relative to a coordinate grid of the rectangular boundary image; d) segmenting the boundary estimate within the rectangular boundary image; e) mapping the segmented boundary estimate from the rectangular boundary image onto the boundary band region to obtain a segmented boundary estimate; f) repeating steps b) through e) using the segmented boundary estimate from the rectangular boundary image as the initial boundary estimate within the boundary band, until the tolerance difference is below a threshold; and g) mapping the segmented boundary band onto the image, thus providing a segmented boundary estimate.
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Specification