AUTOMATIC SYSTEM CALIBRATION METHOD OF X-RAY CT
First Claim
Patent Images
1. A method of reconstructing a computed tomography (CT) image, the method comprising:
- i) obtaining an initial CT image;
ii) performing a reconstruction algorithm on the initial CT image to obtain a reconstructed image of the initial CT image;
iii) using the reconstructed image to adjust one or more parameters associated with the image;
iv) using the adjusted one or more parameters to perform the reconstruction algorithm on the reconstructed image to obtain an updated reconstructed image; and
v) repeating steps iii)-iv), using the most-recently updated reconstructed image in each repeated step iii), and updating the same one or more parameters in each repeated step iii) until a threshold value of a predetermined characteristic is met.
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Abstract
Systems and methods for geometric calibration and image reconstruction in computed tomography (CT) scanning using iterative reconstruction algorithms are provided. An iterative reconstruction algorithm can be used to reconstruct an improved image, and then the improved image can be used to adjust inaccurate parameters by using a Locally Linear Embedding (LLE) method. Adjusted parameters can then be used to reconstruct new images, which can then be used to further adjust the parameters. The steps of this iterative process can be repeated until a quality threshold is met.
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Citations
40 Claims
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1. A method of reconstructing a computed tomography (CT) image, the method comprising:
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i) obtaining an initial CT image; ii) performing a reconstruction algorithm on the initial CT image to obtain a reconstructed image of the initial CT image; iii) using the reconstructed image to adjust one or more parameters associated with the image; iv) using the adjusted one or more parameters to perform the reconstruction algorithm on the reconstructed image to obtain an updated reconstructed image; and v) repeating steps iii)-iv), using the most-recently updated reconstructed image in each repeated step iii), and updating the same one or more parameters in each repeated step iii) until a threshold value of a predetermined characteristic is met. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 11, 18, 19, 23, 24, 30, 32, 34, 38, 39)
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Specification