Device and method for reconstructing an X-ray computed tomography image
AssigneeKoninklijke Philips N.V.
InventorsFrank Bergner, Bernhard Johannes Brendel, Thomas Koehler
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Abstract
The present invention relates to a device for reconstructing an X-ray tomography image, the device comprising a reconstruction module, which is configured to utilize an ordered subset maximum likelihood optimization with a diagonal paraboloid approximation of a cost function for the reconstructing of the X-ray tomography image; and a calculation module, which is configured to calculate a pre-computable denominator term for the cost function for a plurality of subsets of projection data based on a distribution of diagonal denominator terms over the plurality of the subsets of the projection data.
Claims14
A computer-implemented device for reconstructing an X-ray tomography image, the device comprising:
- a memory storage configured to store computer executable instructions;
- and
- at least one processor configured to execute the computer executable instructions to configure the device to:
- utilize an ordered subset maximum likelihood optimization with a diagonal paraboloid approximation of a cost function for reconstructing the X-ray tomography image;
- calculate a pre-computable denominator term for the cost function for a plurality of subsets of projection data based on a distribution of diagonal denominator terms over the plurality of the subsets of the projection data;
- define a plurality of voxels in a subset of spectral denominator images, and define subsets of the plurality of the voxels depending on a material of each voxel of the plurality of the voxels.
A computer-implemented method for reconstructing an X-ray tomography image, the method comprising:
- utilizing an ordered subset maximum likelihood optimization with a diagonal paraboloid approximation of a cost function for reconstructing the X-ray tomography image;
- calculating a pre-computable denominator term for the cost function for a plurality of subsets of projection data based on a distribution of diagonal denominator terms over the plurality of the subsets of the projection data;
- defining a plurality of voxels in a subset of spectral denominator images and defining subsets of the plurality of the voxels depending on a material of each voxel of the plurality of the voxels.
Dependencies are inferred from the claim text.