System and method for iterative image reconstruction
AssigneeGeneral Electric Company
InventorsThomas Matthew Benson, Bruno Kristiaan Bernard De Man, Lin Fu
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Abstract
Methods are provided for iteratively reconstructing an image signal to generate a reconstructed image signal. In one embodiment, sub-iterations of each iteration are performed on pixel or voxel subsets. The subsets may be composed of neighboring or spatially separated pixel or voxels and may extend in the z-direction. In one embodiment, an update step of the iterative reconstruction involves the direct inversion of an approximation of a Hessian matrix associated with the respective subsets. In further embodiments, non-negativity or other limitations or constraints on update values may be enforced.
Claims20
A method for iteratively reconstructing image data, comprising the steps of:
- accessing an initial image;
- defining a plurality of image element subsets of the initial image, wherein some or all of the plurality of image element subsets correspond to voxels aligned in z such that they share the same (x,y) location;
- iteratively generating updates to the initial image or a subsequent updated image based on the respective image element subsets, wherein at least one of the updates is generated by directly inverting a respective Hessian matrix or an approximation of a respective Hessian matrix associated with a corresponding image element subset;
- and
- terminating the iterative generation of updates upon satisfaction of a completion criterion.
One or more non-transitory machine readable media, encoding one or more routines which, when executed by a processor, perform acts comprising:
- generating an initial image;
- iteratively updating a plurality of image element subsets of the initial image or of a subsequent updated image, wherein one or more of the updates is generated by directly inverting an approximation of a respective Hessian matrix associated with a corresponding image element subset, and wherein some or all of the plurality of image element subsets correspond to voxels aligned in z such that they share the same (x,y) location;
- and
- terminating the iterative generation of updates upon satisfaction of a completion criterion.
A method for iteratively reconstructing image data, comprising the steps of:
- accessing an initial image;
- iteratively updating a plurality of image element subsets of the initial image or a subsequent updated image, wherein the iteratively generated updates are limited such that the updates, when applied, do not result in negative values, and wherein the iterative updates are applied recursively such that image elements that would be updated to a negative value are set to zero and removed from the respective image element subset to generate a smaller image element subset that is updated separately;
- and
- terminating the iterative generation of updates upon satisfaction of a completion criterion.
Dependencies are inferred from the claim text.