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.
Claims21
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, by a processor of a PET system, the random contribution as a product of transverse singles efficiencies with the plurality ring detectors treated as one ring along an axial direction;
- reducing, by the processor of the PET system, variance of the random contribution as a function of the modeling;
- and
- reconstructing, by the processor of the PET system, 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 of a positron emission tomography scanner for random sinogram variance reduction in continuous bed motion acquisition, the storage medium comprising instructions for:
- acquiring, with the 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;
- decomposing, by the programmed processor of the PET scanner, 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 by a bed of the PET scanner, with the plurality ring detectors treated as one ring along an axial direction;
- solving, by the programmed processor of the PET scanner, for a mean random sinogram from the transverse efficiencies;
- and
- smoothing, by the programmed processor of the PET scanner, 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;
- and
- 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 direction, with the plurality ring detectors treated as one ring along an axial direction.
Dependencies are inferred from the claim text.