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

ESTRO Teaching Course Advanced Imaging: PET – Basic Principles Log-lin count rate profiles of line source in air/water show additive scatter component outside of central peak [2].

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