[Castor-users] PET List-mode Normalization

Reza Teimoori reza.teimoori.s at gmail.com
Tue Nov 21 22:19:57 CET 2017


Hi All,

I've got a rather fundamental question with regards to sensitivity
correction in PET list-mode reconstruction using CASToR.

My understanding is that, when PET list-mode data with normlization
coefficients are to be used in CASToR, one must provide a separate
normalization data file through the use of '-norm'. According to the
benchmark bash script, the normalization data file "is a collection of all
data channels where events can be recorded, with their associated
normalization correction factors. It is used to compute the sensitivity
image at the beginning of the execution". This may be a naive question, but
can someone please explain to me why we need a sensitivity image when a
sensitivity coefficient is provided for each recorded list-mode event?

Thank you,
Reza
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