System and method of image artifact reduction in fast kVp switching CT
First Claim
1. A CT system comprising:
- a rotatable gantry having an opening for receiving an object to be scanned;
an x-ray source coupled to the gantry and configured to project x-rays through the opening;
a generator configured to energize the x-ray source to a first kilovoltage (kVp) and to a second kVp to generate the x-rays;
a detector having pixels therein, the detector attached to the gantry and positioned to receive the x-rays; and
a computer programmed to;
acquire a first view dataset with the x-ray source energized to the first kVp and a second view dataset with the x-ray source energized to the second kVp;
generate a base correction image using the first view dataset and the second view dataset;
reconstruct a pair of base material images from the first view dataset and from the second view dataset;
estimate artifact correlation in the pair of base material images using the base correction image;
generate a pair of final base material images and a final monochromatic image; and
correct one of the pair of final base material images and the final monochromatic image at a keV value using the estimated artifact correlation.
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Accused Products
Abstract
A CT system includes a generator configured to energize an x-ray source to a first kilovoltage (kVp) and to a second kVp, and a computer that is programmed to acquire a first view dataset with the x-ray source energized to the first kVp and a second view dataset with the x-ray source energized to the second kVp, generate a base correction image using the first view dataset and the second view dataset, and reconstruct a pair of base material images from the first view dataset and from the second view dataset. The computer is also programmed to estimate artifact correlation in the pair of base material images using the base correction image, generate a pair of final base material images and a final monochromatic image, and correct one of the pair of final base material images and the final monochromatic image at a keV value using the estimated artifact correlation.
28 Citations
26 Claims
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1. A CT system comprising:
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a rotatable gantry having an opening for receiving an object to be scanned; an x-ray source coupled to the gantry and configured to project x-rays through the opening; a generator configured to energize the x-ray source to a first kilovoltage (kVp) and to a second kVp to generate the x-rays; a detector having pixels therein, the detector attached to the gantry and positioned to receive the x-rays; and a computer programmed to; acquire a first view dataset with the x-ray source energized to the first kVp and a second view dataset with the x-ray source energized to the second kVp; generate a base correction image using the first view dataset and the second view dataset; reconstruct a pair of base material images from the first view dataset and from the second view dataset; estimate artifact correlation in the pair of base material images using the base correction image; generate a pair of final base material images and a final monochromatic image; and correct one of the pair of final base material images and the final monochromatic image at a keV value using the estimated artifact correlation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of acquiring CT imaging data, the method comprising:
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reconstructing at least two base material images using high and low peak kilovoltage (kVp) CT imaging datasets; generating a monochromatic raw image from the high and low kVp CT imaging datasets; applying one or more parallel beam forward projections to the monochromatic raw image; applying a correction to each of the one or more parallel beam forward projections; summing the corrected one or more parallel beam forward projections to generate a sum of projections; applying a filtered back-projection to the sum of projections using a prescribed field-of-view, to generate a base corrected image; and estimating artifact correlation based on the base corrected image. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A computer readable storage medium having stored thereon a computer program comprising instructions, which, when executed by a computer, cause the computer to:
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acquire high and low peak kilovoltage (kVp) CT imaging datasets; reconstruct a first base material image and a second base material image from the high and low kVp CT imaging datasets; generate a raw monochromatic image from the high and low kVp CT imaging datasets; process the raw monochromatic image to separate a first material at a first given threshold; forward project the first separated material; apply projection space processing and a filtered back-projection to the projection of the first separated material to generate a base corrected image; and correct one of a final monochromatic image and the first and second base material images using the base corrected image. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A method of acquiring CT imaging data, the method comprising:
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reconstructing at least two base material images using high and low peak kilovoltage (kVp) CT imaging datasets; generating a base material raw image from the high and low kVp CT imaging datasets; applying one or more parallel beam forward projections to the base material raw image; applying a correction to each of the one or more parallel beam forward projections; summing the corrected one or more parallel beam forward projections to generate a sum of projections; applying a filtered back-projection to the sum of projections using a prescribed field-of-view, to generate a base corrected image; and estimating artifact correlation based on the base corrected image. - View Dependent Claims (23, 24, 25, 26)
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Specification