2017 Imaging for Physicists Coursebook

Performance of PET Systems: 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

Log-lin count rate profiles of line source in air/water show additive scatter component outside of central peak [2].

27

ESTRO Teaching Course Advanced Imaging: PET – Basic Principles