Random Sinogram Variance Reduction in Continuous Bed Motion Acquisition
AssigneeSiemens Medical Solutions USA, Inc.
InventorVladimir Y. Panin
Life of this patent
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Abstract
Random sinogram variance is reduced in continuous bed motion acquisition. The randoms are modeled as a product of transverse singles efficiencies. The random sinogram is assumed to be a smooth function in the axial direction, collapsing the parameterization for estimating the transverse singles efficiencies into a single, conceptual ring. By solving the product, the mean random values are used to smooth the randoms in image reconstruction with less noise and artifacts.
Claims20
A method for random sinogram variance reduction in continuous bed motion acquisition, the method comprising:
- acquiring, with a positron emission tomography (PET) scanner having a plurality of rings of detectors, line-of-response events from a patient while the patient is moving in the PET scanner, at least some of the line-of-response events comprising random contribution;
- modeling the random contribution as a product of transverse singles efficiencies with the plurality ring detectors treated as one ring along an axial direction;
- reducing variance of the random contribution as a function of the modeling;
- and
- reconstructing an image of the patient as a function of the reducing.
In a non-transitory computer readable storage medium having stored therein data representing instructions executable by a programmed processor for random sinogram variance reduction in continuous bed motion acquisition, the storage medium comprising instructions for:
- decomposing sinogram plane randoms into two-dimensional transverse efficiencies, the two-dimensional transverse efficiencies being transverse to an axial dimension, the sinogram plane randoms corresponding to the continuous bed motion acquisition;
- solving for a mean random sinogram from the transverse efficiencies;
- and
- smoothing variance of the sinogram plane randoms in the axial dimension as a function of the mean random sinogram.
A system for random sinogram variance reduction in continuous bed motion acquisition, the system comprising:
- a bed configured to move during a positron emission tomography (PET) scan;
- rings of detectors spaced axially operable to perform the PET scan while the bed moves;
- a processor connected to the detectors, the processor configured to constrain random contribution to line-of-response events as a function of a product of efficiencies of the detectors, the product being transverse to an axial dimension.
Dependencies are inferred from the claim text.