Artifact correction for highly attenuating objects
First Claim
1. A method of correcting for artifacts caused by highly attenuating objects in image data, the image data collected in a computed tomography system, said method comprising the steps of:
- determining an attenuation characteristic for each highly attenuating material of the highly attenuating objects;
identifying the highly attenuating objects in the image; and
generating error-only image data for each highly attenuating object.
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Abstract
The present invention, in one form, is a method for correcting for artifacts caused by highly attenuating objects in a CT image data using a correction algorithm. In accordance with one embodiment of the algorithm, the highly attenuating objects are identified in the image data using the CT numbers from the image data. The segmented image data for each highly attenuating material are used to produce separate component images for each material. The component image data for each material is then separately forward projected to generate projection data for each material. The projection data for each material is then adjusted for the attenuation characteristic of the material to generate projection error data for each material. The resulting projection error data are then filtered and backprojected to produce error-only image data. The error-only image data are then scaled and combined with the original image data to remove the highly attenuating object artifacts.
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Citations
29 Claims
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1. A method of correcting for artifacts caused by highly attenuating objects in image data, the image data collected in a computed tomography system, said method comprising the steps of:
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determining an attenuation characteristic for each highly attenuating material of the highly attenuating objects; identifying the highly attenuating objects in the image; and generating error-only image data for each highly attenuating object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for correcting for artifacts caused by highly attenuating objects in image data, the image data collected in a tomography scan, said system configured to:
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determine an attenuation characteristic for each material of the highly attenuating objects; identify the highly attenuating objects in the image data; and generate error-only image data for each high attenuating object. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification