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 that includes at least normal data and saturated data from a subject;
compare a profile of the normal data to an off-centered phantom;
generate data from the off-centered phantom; and
correct the saturated data using the generated data.
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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.
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Citations
20 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 that includes at least normal data and saturated data from a subject; compare a profile of the normal data to an off-centered phantom; generate data from the off-centered phantom; and correct the saturated data using the generated data. - View Dependent Claims (2, 3, 4)
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5. A method of CT data correction comprising the steps of:
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acquiring CT data from an object, the CT data including normal data and saturated data; comparing a profile of the normal data to an off-centered phantom or synthetic data profile; and correcting for saturation in the data from the comparison. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An 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; segregate the acquired CT data for a detector element into normal data and corrupted data; select the normal data; compare a profile of the normal data to an off-centered phantom or synthetic data profile; and use the off-centered phantom or synthetic data profile to correct for saturation. - View Dependent Claims (18, 19, 20)
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Specification