Rigid body tracking for radiosurgery
First Claim
Patent Images
1. A method comprising, using a processing device to perform:
- comparing a pair of X-ray images of a volume of interest with a corresponding pair of reference images from a 3-D scan of the volume of interest to determine a combined similarity measure between the pair of X-ray images and the corresponding pair of reference images, wherein the combined similarity measure includes six transformation parameters; and
searching a single combined six-parameter registration search space to maximize the combined similarity measure, wherein the pair of X-ray images is jointly registered with the pair of reference images.
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Abstract
A method and apparatus compares in-treatment X-ray images of a volume with pre-treatment reference images of the volume and determines a combined similarity measure. A combined registration search space is searched to maximize the combined similarity measure and to jointly register the in-treatment X-ray images with the pre-treatment images.
65 Citations
25 Claims
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1. A method comprising, using a processing device to perform:
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comparing a pair of X-ray images of a volume of interest with a corresponding pair of reference images from a 3-D scan of the volume of interest to determine a combined similarity measure between the pair of X-ray images and the corresponding pair of reference images, wherein the combined similarity measure includes six transformation parameters; and searching a single combined six-parameter registration search space to maximize the combined similarity measure, wherein the pair of X-ray images is jointly registered with the pair of reference images. - View Dependent Claims (2, 3, 8)
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4. A method comprising, using a processing device to perform:
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comparing a pair of X-ray images of a volume of interest with a corresponding pair of reference images from a 3-D scan of the volume of interest to determine a combined similarity measure between the pair of X-ray images and the corresponding pair of reference images, wherein the combined similarity measure includes six transformation parameters; and searching a combined six-parameter registration search space to maximize the combined similarity measure, wherein the pair of X-ray images is jointly registered with the pair of reference images and wherein searching the combined six-parameter registration search space comprises; searching for no more than three in-plane translation parameters in two projections; searching for no more than two in-plane rotation parameters in the two projections, including searching initially for the two in-plane rotation parameters using two-parameter multi-resolution matching, and refining the two in-plane rotation parameters using one of 2-D curve-fitting and gradient minimization; and searching for no more than one common out-of-plane rotation parameter in the two projections. - View Dependent Claims (5, 6, 7)
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9. An article of manufacture, including machine-accessible instructions that when accessed by a data processing system, cause the data processing system to perform a method, comprising:
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comparing a pair of X-ray images of a volume of interest with a corresponding pair of reference images of the volume of interest to determine a combined similarity measure between the pair of X-ray images and the corresponding reference images , wherein the combined similarity measure includes six transformation parameters; and searching a single combined six-parameter registration search space to maximize the combined similarity measure, wherein the pair of X-ray images is jointly registered with the pair of reference images. - View Dependent Claims (10, 15)
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11. An article of manufacture, including machine-accessible instructions that when accessed by a data processing system, cause the data processing system to perform a method, comprising:
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comparing a pair of X-ray images of a volume of interest with a corresponding pair of reference images of the volume of interest to determine a combined similarity measure between the pair of X-ray images and the corresponding reference images, wherein the combined similarity measure includes six transformation parameters; and searching a combined six-parameter registration search space to maximize the combined similarity measure, wherein the pair of X-ray images is jointly registered with the pair of reference images, and wherein searching the combined six-parameter registration search space comprises; searching for no more than three in-plane translation parameters in two projections; searching for no more than two in-plane rotation parameters in the two projections, wherein searching for the two in-plane rotation parameters in the two projections includes searching initially for the two in-plane rotation parameters using two-parameter multi-resolution matching, and refining the two in-plane rotation parameters using one of 2-D curve-fitting and gradient minimization; and searching for no more than one common out-of-plane rotation parameter in the two projections. - View Dependent Claims (12, 13, 14)
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- 16. A system comprising a processing device, wherein the processing device is configured to compare a pair of X-ray images of a volume of interest with a corresponding pair of reference images of the volume of interest to determine a combined similarity measure between the pair of X-ray images and the corresponding reference images, wherein the combined similarity measure includes six transformation parameters, and wherein the processing device is further configured to search a single combined six-parameter registration search space to maximize the combined similarity measure, wherein the pair of X-ray images is jointly registered with the pair of reference images.
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18. A system comprising:
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a processing device, wherein the processing device is configured to; compare a pair of X-ray images of a volume of interest with a corresponding pair of reference images of the volume of interest to determine a combined similarity measure between the pair of X-ray images and the corresponding reference images, wherein the combined similarity measure includes six transformation parameters; and search a combined six-parameter registration search space to maximize the combined similarity measure, wherein the pair of X-ray images is jointly registered with the pair of reference images, and wherein a search of the combined six-parameter registration search space includes a search for no more than three in-plane translation parameters in two projections, a search for no more than two in-plane rotation parameters in the two projections, wherein the search for the two out-of-plane rotation parameters in the two projections includes searching initially for the two in-plane rotation parameters using two-parameter multi-resolution matching, and refining the two in-plane rotation parameters using one of 2-D curve-fitting and gradient minimization, and a search for no more than one common out-of-plane rotation parameter in the two projections. - View Dependent Claims (19, 20, 21, 22)
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24. An apparatus, comprising:
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means for comparing a pair of X-ray images of a volume of interest with a corresponding pair of reference images from a 3-D scan of the volume of interest to determine a combined similarity measure between the pair of X-ray images and the corresponding pair of reference images, wherein the combined similarity measure includes six transformation parameters; and means for searching a single combined six-parameter registration search space to maximize the combined similarity measure, wherein the pair of X-ray images is jointly registered with the pair of reference images. - View Dependent Claims (25)
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Specification