Method and system of CT data correction
First Claim
1. A CT imaging system comprising:
- a rotatable gantry having an opening therein to receive a subject to be scanned;
an x-ray source disposed within the rotatable gantry and configured to project a fan beam of x-rays at a subject during CT data acquisition; and
a computer programmed to;
acquire CT data from an object using a plurality of detector elements;
identify the CT data in each of the detector elements as one of normal data, noisy data, and saturated data;
correct the saturated data using an iterative technique; and
determine whether the iterative technique has converged to render a corrected image.
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Abstract
An adaptive CT data acquisition system and technique is presented whereby radiation emitted for CT data acquisition is dynamically controlled to limit exposure to those detectors of a CT detector assembly that may be particularly susceptible to saturation during a given data acquisition. The data acquisition technique recognizes that for a given subject size and position that pre-subject filtering and collimating of a radiation beam may be insufficient to completely prevent detector saturation. Therefore, the present invention includes implementation of a number of CT data correction techniques for correcting otherwise unusable data of a saturated CT detector. These data correction techniques include a nearest neighbor correction, off-centered phantom correction, off-centered synthetic data correction, scout data correction, planar radiogram correction, and a number of others. The invention is applicable with energy discriminating CT systems as well as with conventional CT systems and other multi-energy CT systems, such as dual kVp-based systems.
60 Citations
18 Claims
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1. A CT imaging system comprising:
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a rotatable gantry having an opening therein to receive a subject to be scanned; an x-ray source disposed within the rotatable gantry and configured to project a fan beam of x-rays at a subject during CT data acquisition; and a computer programmed to; acquire CT data from an object using a plurality of detector elements; identify the CT data in each of the detector elements as one of normal data, noisy data, and saturated data; correct the saturated data using an iterative technique; and determine whether the iterative technique has converged to render a corrected image. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of verifying iteratively corrected CT data comprising the steps of:
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acquiring CT data from an object using a plurality of detector elements; characterizing the CT data in each of the detector elements as one of normal data, noisy data, and saturated data; correcting any saturated data using an iterative technique; and determining whether the iterative technique has converged to render a corrected image. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A computer readable storage medium having a computer programmed thereon and representing a set of instructions that when executed by a computer causes the computer to:
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acquire CT data from an object using a plurality of detector elements; characterize the CT data in each of the detector elements as one of normal data, noisy data, and saturated data; generate a CT image using an iterative technique; correct the saturated data; and determine whether the iterative technique has converged to render a corrected image. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification