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Source-to-Background Algorithms
ESTRO Teaching Course Advanced Imaging: PET – Reconstruction, Contouring
35
signal intensity
position
I
bg
I
source
T = C·I
source
+ I
bg
Constant C determined from phantom measurements
Works very well for quasi-spherical lesions
Value of C depending of different factors:
●
Lesion size and shape
●
Scanner type and calibration
●
Reconstruction protocol
●
Image analysis software
Schaefer et al, EJNMMI 2008;
35(11): 1989-99.
PET image
Line profile