Plane-dependent ML scatter scaling: 3D extension of the 2D simulated single scatter (SSS) estimate.

ABSTRACT: Scatter correction is typically done using a simulation of the single scatter, which is then scaled to account for multiple scatters and other possible model mismatches. This scaling factor is determined by fitting the simulated scatter sinogram to the measured sinogram, using only counts measured along LORs that do not intersect the patient body, i.e. 'scatter-tails'. Extending previous work, we propose to scale the scatter with a plane dependent factor, which is determined as an additional unknown in the maximum likelihood (ML) reconstructions, using counts in the entire sinogram rather than only the 'scatter-tails'. The ML-scaled scatter estimates are validated using a Monte-Carlo simulation of a NEMA-like phantom, a phantom scan with typical contrast ratios of a ⁶⁸Ga-PSMA sc

SUBMITTER: Rezaei A 

PROVIDER: S-EPMC5748468 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature