2016_Imaging for Physicists

Relative Thresholding

Line profile

PET image

I max

T = x % I max

I bg

signal intensity

position

 Relative Threshold T , depending on the max. intensity  Commonly used: x =42% (40-50%)  Easy to implement  Calibration with phantom measurements possible  Frequently used in clinical routine

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ESTRO Teaching Course Advanced Imaging: PET – Reconstruction, Contouring