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Scatter Fraction
Fraction of the total coincidences recorded in the
photopeak window that have been scattered
Sources of scattering
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Scattering within the object containing the radionuclide
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Scattering off the gantry components (lead septa/side shields)
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Scattering within the detectors
ESTRO Teaching Course Advanced Imaging: PET – Basic Principles
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Log-lin count rate profiles of line source in air/water show additive scatter
component outside of central peak [2].