[Gate-users] whether the position calculation is wrong for singles?

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Hello Gate-developers


I constructed a PET cylinder scanner, and run simulation, where the 
source is back-to-back Gamma sourece of 511 keV  isotropically .

But when I plot the DOI of singles 1 and single 2 of coincidences.  I 
find the distribution of DOI of singles 1 is correct, like an 
experiential , however, the DOI of  singles 2 is not, which is wrong 
obviously.

I just wonder whether  the position calculation of  Gate is wrong for 
singles 2 of coincidences.

BTW, my Gate version is V8.0


Regards,

Chunhui

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