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Page 27
Oliver Jäkel
Medical Physics
Secondary radiation for in-vivo imaging
of proton/ion beam RT
projectile
target
prefragment
evaporated
nucleons
projectile fragment
Clusters
target fragment
Radioactive nuclei:
decay slow, half lives: s/h
De-excitation of nuclei:
-emission, fast ~10
-12
- 10
-9
s
Evaporation of light ions:
p, n,
, very fast ~10
-12
s
Page 28
Oliver Jäkel
Medical Physics
Prompt
-imaging principle
Collimators and attached scintillation counters for various depths:
Problem: low detection efficiency, no “tracking”
Alternativ s: Compton amera (electronic collimation)
Testa PhD thesis 2010