Method and apparatus for compensating for scattering of emission gamma photons for PET imaging
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United States of America Patent
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Nov 29, 2016
Grant Date -
Aug 27, 2015
app pub date -
Apr 16, 2015
filing date -
Feb 5, 2013
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Abstract
A process for operating a PET scanner includes acquiring, at a plurality of detector blocks of the PET scanner, emission data of gamma photons of a first energy level originating from annihilation events associated with radioactivity of a phantom in a field of view of the PET scanner. Based on the emission data, an emission block-pair scattering model is generated. The process includes acquiring counts of gamma photons of a second energy level originating from intrinsic background radiation of scintillator crystals of the detector blocks, without any phantom in the field of view, to provide blank scan data for the second energy level. A sinogram is generated based on the blank scan data for the second energy level. The emission block-pair scattering model is added to a scaled version of the sinogram to yield a composite model.
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