2017 Imaging for Physicists Coursebook
Prompt Events
Single event ●
single photon is counted by detector (1-10%)
True coincidence ●
event derives from single positron-electron annihilation ● both photons reach tomograph without interaction Random coincidence ● two nuclei decay at approximately the same time ● random event count rate (R ab ) between two detectors a and b :
2
2 N NN R b a
ab
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ESTRO Teaching Course Advanced Imaging: PET – Basic Principles
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