Method and apparatus for 3D metal and high-density artifact correction for cone-beam and fan-beam CT imaging
First Claim
Patent Images
1. A method for producing an image of a region of interest while correcting artifacts caused by sub-objects within the region of interest, the method comprising:
- (a) taking three-dimensional image data of the region of interest;
(b) providing a library of shape information and imaging characteristics of the sub-objects;
(c) using the three-dimensional image data and the library to produce images of the sub-objects in the region of interest;
(d) using an iterative optimization process to produce segmented images of the sub-objects in the region of interest;
(e) using the segmented images to produce error projections; and
(f) using the error projections to produce the image of the region of interest such that the artifacts are corrected in the image.
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Abstract
A 3D metal artifacts correction technique corrects the streaking artifacts generated by titanium implants or other similar objects. A cone-beam computed tomography system is utilized to provide 3D images. A priori information (such as the shape information and the CT value) of high density sub-objects is acquired and used for later artifacts correction. An optimization process with iterations is applied to minimize the error and result in accurate reconstruction images of the object.
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Citations
17 Claims
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1. A method for producing an image of a region of interest while correcting artifacts caused by sub-objects within the region of interest, the method comprising:
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(a) taking three-dimensional image data of the region of interest; (b) providing a library of shape information and imaging characteristics of the sub-objects; (c) using the three-dimensional image data and the library to produce images of the sub-objects in the region of interest; (d) using an iterative optimization process to produce segmented images of the sub-objects in the region of interest; (e) using the segmented images to produce error projections; and (f) using the error projections to produce the image of the region of interest such that the artifacts are corrected in the image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for producing an image of a region of interest while correcting artifacts caused by sub-objects within the region of interest, the system comprising:
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a device for supplying three-dimensional image data of the region of interest; a device for providing a library of shape information and imaging characteristics of the sub-objects; a processor, having access to the three-dimensional image data and the library, for; (i) using the three-dimensional image data and the library to produce images of the sub-objects in the region of interest; (ii) using an iterative optimization process to produce segmented images of the sub-objects in the region of interest; (iii) using the segmented images to produce error projections; and (iv) using the error projections to produce the image of the region of interest such that the artifacts are corrected in the image; and an output for outputting the image of the region of interest. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification