Imaging for Physicists
Scatter Fraction Fraction of the total coincidences recorded in the photopeak window that have been scattered Sources of scattering ● Scattering within the object containing the radionuclide
● Scattering off the gantry components (lead septa/side shields) ● Scattering within the detectors
Scatter fraction can be reduced by ● TOF
● Usage of a powerful iterative reconstruction method ● Shielding of scattered photons by septa and endshiels ● Small coincidence window ● Good energy resolution
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ESTRO Teaching Course Advanced Imaging: PET – Basic Principles
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