2016_Imaging for Physicists

Absolute Thresholding

Line profile

PET image

I max

: SUV=4.3

SUV thres

=2.5

I bg

signal intensity

position

 Fix SUV-threshold of 2.0/2.5  Easy to implement  Often fails when the physiologic background activity lies above the threshold  Absolute SUVs are strongly influenced by various technical factors (scan protocol, image acquisition, reconstruction, scanner calibration, etc.)

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ESTRO Teaching Course Advanced Imaging: PET – Reconstruction, Contouring