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 the subject during CT data acquisition; and
a computer programmed to;
acquire CT data from an object in a plurality of detector elements; and
(A) identify saturated views from the CT data;
(B) generate an air-corrected sinogram in the saturated views; and
(C) reconstruct an image from the air-corrected sinogram.
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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.
68 Citations
17 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 the subject during CT data acquisition; and a computer programmed to; acquire CT data from an object in a plurality of detector elements; and (A) identify saturated views from the CT data; (B) generate an air-corrected sinogram in the saturated views; and (C) reconstruct an image from the air-corrected sinogram. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of CT data correction comprising the steps of:
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acquiring CT data from an object in a plurality of detector elements, the CT data being comprised of at least one of normal data, noisy data, and saturated data; and correcting any saturated CT data detector elements using at least the steps of; (A) identifying saturated views of a set of CT views; (B) generating an air-corrected sinogram from the set of CT views; and (C) reconstructing an image from the air-corrected sinogram. - View Dependent Claims (8, 9, 10, 11)
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12. 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 in 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; and correct the saturated CT data detector elements wherein the computer is further programmed to; (A) identify saturated views from the CT data; (B) generate an air-corrected sinogram in the saturated views; and (C) reconstruct an image from the air-corrected sinogram. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification