Methods and apparatus for CT smoothing to reduce artifacts
First Claim
Patent Images
1. A method for reconstructing an image of an object, said method comprising:
- scanning an object using a computed tomographic (CT) imaging apparatus to acquire projections of the object;
determining a set of thresholds utilizing said projections;
associating selected smoothing kernels with said thresholds;
utilizing said smoothing kernels and said projections to produce smoothed projections in accordance with said thresholds; and
filtering and backprojecting the smoothed projections to generate an image of the object.
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Abstract
A method for reconstructing an image of an object includes scanning an object using a computed tomographic (CT) imaging apparatus to acquire projections of the object. A set of thresholds are determined utilizing the projections, and selected smoothing kernels are associated with the thresholds. The method further includes utilizing the smoothing kernels and the projections to produce smoothed projections in accordance with the thresholds and filtering and backprojecting the smoothed projections to generate an image of the object.
42 Citations
42 Claims
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1. A method for reconstructing an image of an object, said method comprising:
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scanning an object using a computed tomographic (CT) imaging apparatus to acquire projections of the object;
determining a set of thresholds utilizing said projections;
associating selected smoothing kernels with said thresholds;
utilizing said smoothing kernels and said projections to produce smoothed projections in accordance with said thresholds; and
filtering and backprojecting the smoothed projections to generate an image of the object. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for reconstructing an image of an object, said method comprising:
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scanning an object using a computed tomographic (CT) imaging apparatus to acquire projections of the object;
producing temporary values utilizing the acquired projections, said producing temporary values including the production of prepped projections to a point prior to a logarithmic operation;
determining shading reduction (SR) factors as a function of the temporary values;
conditionally multiplying the prepped projections using the SR factors;
smoothing the prepped projections in accordance with pre-selected thresholds;
determining final projections utilizing unsmoothed prepped projections and smoothed prepped projections; and
filtering and backprojecting the final projections to generate an image of the object. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A CT imaging apparatus configured to:
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scan an object to acquire projections of the object;
determine a set of thresholds utilizing said projections;
associate selected smoothing kernels with said thresholds;
utilize said smoothing kernels and said projections to produce smoothed projections in accordance with said thresholds; and
filter and backproject the smoothed projections to generate an image of the object. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A CT imaging apparatus configured to:
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scan an object to acquire projections of the object;
produce temporary values utilizing the acquired projections, wherein said production of temporary values includes the production of prepped projections to a point prior to a logarithmic operation;
determine shading reduction (SR) factors as a function of the temporary values;
conditionally multiply the prepped projections using the SR factors;
smooth the prepped projections in accordance with pre-selected thresholds;
determine final projections utilizing unsmoothed prepped projections and smoothed prepped projections; and
filter and backproject the final projections to generate an image of the object. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A computer-readable medium having instructions thereon configured to instruct a computer to:
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determine a set of thresholds utilizing projections obtained by scanning an object;
associate selected smoothing kernels with said thresholds;
utilize smoothing kernels and said projections to produce smoothed projections in accordance with said thresholds; and
filter and backproject the smoothed projections to generate an image of the object. - View Dependent Claims (30, 31, 32, 33, 34)
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35. A computer-readable medium having instructions thereon configured to instruct a computer to:
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produce temporary values utilizing projections acquired from a scan of an object, wherein said production of temporary values includes the production of prepped projections to a point prior to a logarithmic operation;
determine shading reduction (SR) factors as a function of the temporary values;
conditionally multiply the prepped projections using the SR factors;
smooth the prepped projections in accordance with pre-selected thresholds;
determine final projections utilizing unsmoothed prepped projections and smoothed prepped projections; and
filter and backproject the final projections to generate an image of the object. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42)
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Specification