Concurrent reconstruction using multiple bed frames or continuous bed motion
First Claim
Patent Images
1. An imaging system comprising:
- a data memory into which an acquired sinogram of projection data of an entire object is loaded; and
an object reconstruction processor which reconstructs a volumetric image representation of the entire object in successive volumetric image portions, which reconstruction processor is programmed to;
extract sinogram subsets each corresponding to a prespecified axial length from the data memory one at a time, the prespecified axial lengths partially overlapping,sequentially reconstruct sinogram subsets into the successive volume image portions with an iterative reconstruction algorithm using a trailing portion of a preceding image portion as an initial estimate for a leading edge portion of a currently reconstructed image portion of the image and reconstructs the trailing edge portion of the currently reconstructed image portion to be used as an initial estimate for a leading edge portion of a next subsequent image portion.
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Abstract
In an imaging system (10), a short axial length 4D sinograms are loaded one at a time from a data memory (40). A portion of an image memory (44) that corresponds to a currently reconstructed sinogram subset (1112), is initialized. If a part of the object is already reconstructed, an iterative reconstruction is performed in which the previously reconstructed image (m1) is iteratively improved by using the data from the currently reconstructed overlapping image (m2) to converge on the final image.
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Citations
23 Claims
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1. An imaging system comprising:
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a data memory into which an acquired sinogram of projection data of an entire object is loaded; and an object reconstruction processor which reconstructs a volumetric image representation of the entire object in successive volumetric image portions, which reconstruction processor is programmed to; extract sinogram subsets each corresponding to a prespecified axial length from the data memory one at a time, the prespecified axial lengths partially overlapping, sequentially reconstruct sinogram subsets into the successive volume image portions with an iterative reconstruction algorithm using a trailing portion of a preceding image portion as an initial estimate for a leading edge portion of a currently reconstructed image portion of the image and reconstructs the trailing edge portion of the currently reconstructed image portion to be used as an initial estimate for a leading edge portion of a next subsequent image portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An imaging method comprising:
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extracting sinogram subsets corresponding to a prespecified axial length from a data memory one at a time which data memory holds sinogram data acquired over a region of an object; applying an iterative reconstruction algorithm to each of the sinogram subsets in which an estimated image is iteratively improved to converge on a final image, including;
applying an iterative algorithm to each of the sinogram subsets in which an estimated image is iteratively improved to converge on a final image of the region of the object, including;(a) applying the iterative reconstruction algorithm to a given one of the sinogram subsets to estimate a portion of a current image section using a portion of a preceding image section, and finishing the portion of the preceding image section; and (b) repeating step (a) to apply the iterative reconstruction algorithm to the plurality of sinogram subsets to reconstruct the final image of the region of the object. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. An imaging method comprising:
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continuously advancing a subject support; with a scanner, acquiring sinogram data of an object during the continuous motion of the subject support; storing the sinogram data in a data memory; extracting sinogram subsets corresponding to a prespecified axial length from the data memory one at a time; sequentially reconstructing each of the sinogram subsets one at a time into successive volume image sections corresponding to successive regions of the object, each region of the object having an axial length equal to at least a half of a field of view of the scanner; wherein the step of reconstructing further includes;
initially estimating an image portion adjacent a leading edge one image section and finalizing an image portion adjacent a trailing edge of a preceding image section. - View Dependent Claims (23)
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Specification