Iterative reconstruction of tomographic image data method and system
First Claim
1. A method for performing image reconstruction, comprising:
- deriving background projection data for an area outside a targeted field of view and an area inside a scan field of view of a tomographic image;
reconstructing the tomographic image of the targeted field of view, said reconstructing comprising;
obtaining an image estimate of the scan field of view;
forward projecting the image estimate of the scan field of view;
comparing the targeted projection data with the forward projected image estimate to obtain a correction ratio;
back projecting the correction ratio to obtain correction image data;
applying the correction image data to the image estimate to obtain an updated image estimate, andwherein the background projection data is used in the reconstruction.
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Abstract
Methods for performing image reconstruction that include deriving background projection data for an area outside a targeted field of view of a tomographic image, and reconstructing the tomographic image of the targeted field of view, wherein the background projection data is used in the reconstruction. Methods for selecting a reconstruction methodology that include determining a number of pixels in a reconstructed image for a first reconstruction methodology, determining a number of pixels in a reconstructed image for a second reconstruction methodology, comparing the number of pixels for the first reconstruction methodology and the number of pixels for the second reconstruction methodology, and selecting the reconstruction methodology for image reconstruction based on the comparison of the number of pixels. Imaging systems implementing these methods are also provided.
98 Citations
29 Claims
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1. A method for performing image reconstruction, comprising:
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deriving background projection data for an area outside a targeted field of view and an area inside a scan field of view of a tomographic image; reconstructing the tomographic image of the targeted field of view, said reconstructing comprising; obtaining an image estimate of the scan field of view; forward projecting the image estimate of the scan field of view; comparing the targeted projection data with the forward projected image estimate to obtain a correction ratio; back projecting the correction ratio to obtain correction image data; applying the correction image data to the image estimate to obtain an updated image estimate, and wherein the background projection data is used in the reconstruction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for selecting a reconstruction methodology, comprising:
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determining a number of pixels in a reconstructed image for a first reconstruction methodology; determining a number of pixels in a reconstructed image for a second reconstruction methodology; comparing the number of pixels for the first reconstruction methodology and the number of pixels for the second reconstruction methodology; and selecting the reconstruction methodology for image reconstruction based on the comparison of the number of pixels. - View Dependent Claims (16, 17)
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18. An imaging system comprising:
image reconstruction and processing circuitry configured to derive background projection data for an area outside a targeted field of view of a tomographic image and an area inside a scan field of view, to obtain an image estimate of the scan field of view, to forward project the image estimate of the scan field of view, to compare the targeted projection data with the forward projected image estimate to obtain a correction ratio, to back project the correction ratio to obtain correction image data, and to apply the correction image data to the image estimate to obtain an updated image estimate and to reconstruct the tomographic image of the targeted field of view, wherein the background projection data is used in the reconstruction. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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26. An imaging system comprising:
image reconstruction and processing circuitry configured to determine a number of pixels in a reconstructed image for a first reconstruction methodology, to determine a number of pixels in a reconstructed image for a second reconstruction methodology, to compare the number of pixels for the first reconstruction methodology and the number of pixels for the second reconstruction methodology, and to select the reconstruction methodology for image reconstruction based on the comparison of the number of pixels. - View Dependent Claims (27)
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28. A computer program, stored on a computer readable medium, for performing image reconstruction, the program constructed and arranged to derive background projection data for an area outside a targeted field of view of a tomographic image and an area inside a scan field of view, and to reconstruct the tomographic image of the targeted field of view by the steps comprising:
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obtaining an image estimate of the scan field of view; forward projecting the image estimate of the scan field of view; comparing the targeted projection data with the forward projected image estimate to obtain a correction ratio; back projecting the correction ratio to obtain correction image data; applying the correction image data to the image estimate to obtain an updated image estimate, and wherein the background projection data is used in the reconstruction.
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29. A computer program, stored on a computer readable medium, for performing image reconstruction, the program constructed and arranged to determine a number of pixels in a reconstructed image for a first reconstruction methodology, to determine a number of pixels in a reconstructed image for a second reconstruction methodology, to compare the number of pixels for the first reconstruction methodology and the number of pixels for the second reconstruction methodology, and to select the reconstruction methodology for image reconstruction based on the comparison of the number of pixels.
Specification