Random sinogram variance reduction in continuous bed motion acquisition

摘要

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.

主权项

1. 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.