Radial adaptive filter for metal artifact correction
First Claim
1. A diagnostic imaging system which corrects metal artifact streaks emanating from a high attenuating object in an uncorrected tomographic image, the system comprising:
- a first vector means for determining a direction vector for each pixel, which direction vector points in the direction of the high attenuating object;
a second vector means for determining an orientation vector for each pixel, which orientation vector coincides with a steepest gradient direction; and
an adaptive filter means for adaptively filtering the uncorrected tomographic image based at least on the determined orientation of the steepest gradient vector.
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Accused Products
Abstract
A diagnostic imaging system (10) corrects metal artifact streaks (38) emanating from a metal object (36) in a tomographic image (T). A first processor (40) reduces streaks (38) caused by mild artifacts by applying an adaptive filter (82). The filter (82) is perpendicularly oriented toward the center of the metal object (36). The weight of the filter (82) is a function of the local structure tensor and the vector pointing to the metal object (36). If it is determined that the strong artifacts are present in the image, a second processor (48) applies a sinogram completed image algorithm to correct for severe artifacts in the image. The sinogram completed image and adaptively filtered image are fused to a final corrected image. In the fusion process, highly corrupted tomographic regions are replaced by the result of the sinogram completed image and the remainder is replaced by the adaptively filtered image.
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Citations
18 Claims
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1. A diagnostic imaging system which corrects metal artifact streaks emanating from a high attenuating object in an uncorrected tomographic image, the system comprising:
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a first vector means for determining a direction vector for each pixel, which direction vector points in the direction of the high attenuating object; a second vector means for determining an orientation vector for each pixel, which orientation vector coincides with a steepest gradient direction; and an adaptive filter means for adaptively filtering the uncorrected tomographic image based at least on the determined orientation of the steepest gradient vector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of diagnostic imaging, which corrects metal artifact streaks emanating from a high attenuating object in an uncorrected tomographic image, comprising:
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determining a direction vector for each pixel which direction vector points in the direction of the high attenuating object; determining an orientation vector for each pixel which orientation vector coincides with a direction of steepest gradient; and adaptively filtering the uncorrected tomographic image based at least on the determined orientation of the steepest gradient vector. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification