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Normalization
ESTRO Teaching Course Advanced Imaging: PET – Reconstruction, Contouring
4
LORs have different sensitivities
Individual correction factor for each LOR
Correction Methods:
Direct Normalization
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Illumination of all possible LORs with planar or rot. line source
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Long scan times necessary
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Sources must have very uniform activity distribution
Component-based Model for Normalization
Mean radial geometric profiles for
three block-detectors. Asymmetry
due to the fact that centre of rotation
of sources not coincident with center
of detector ring (from [2]).