Imaging for Physicists

Basic principle of PET

 Positron emitters (β+) used as biomarkers  Positron-electron annihilation ⇒ Two γ-quanta with 511 keV each are emitted under approx. 180 °

 Coincidence detection in a detector ring

Radioactive Isotope

511 keV γ-quant

γ 1

β +

Electron

γ 2

511 keV γ-quant

PET

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ESTRO Teaching Course Advanced Imaging: PET – Basic Principles