Important Detector Properties Scatter and Attenuation 511 keV
Scattered gammas change direction AND lose energy
Affects acceptance of scattered coincidences
Currently ~ 20%
Handle MHz count rates!
511 keV 400 keV
Prototypical PET Detector Scintillation Crystal PMT Pre-Amplifier + Electronics Gamma photon converts to optical photons (proportional to gamma energy, typ. 1000’s) photons are collected at the end of the crystal light is converted to an electrical signal & amplified Front-end electronics condition the signal for further processing Gamma Ray Optical reflector