[Gate-users] Divergence between GATE simulation and the reality

[Albert Grace Lieu]

Dear GATE users,

I have modeled a real PET system in GATE as close to the real system as I
can. However, during the noise equivalent count collaboration, GATE is
always much better (about 50%) than the real system. After lots of effort,
we looked at the results of the NEMA sensitivity experiment (very low dose,
~500 uci) and found that GATE collected about 25% more counts than the real
system.

I was wondering if there is some calibration work done between GATE
simulation and reality. Could someone give any help on how to further debug
or make clear what causes this discrepancy between simulation and reality?

Thanks a lot.
Zhengzhi
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