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Scatter Correction
ESTRO Teaching Course Advanced Imaging: PET – Reconstruction, Contouring
6
Most likely: Compton scattering
Compton equation
l
Relates photon energy before (
E
) and after scattering (
E
sc
) to
scattering angle
Ω
l
m
0
c
2
: resting energy of electron before scattering
Correction strategies:
●
Fitting scatter tails
●
Direct measurement
●
Dual energy window methods
●
Multiple energy window
methods
●
Simulation-based methods
(
)
Ω −
+
=
cos 1
1
2
0
cm
E
E
E
sc
Spectral distribution of scattered
511 keV photons [2].