[Gate-users] Several questions about the ASCII data output

[Qiyong Fan]

Dear Gate users,

I am using GATE V5 to do a PET experiment with ASCII data output. I have
several questions,


1. In the output coincidence file "gateCoincidences.dat", the user guide
says for column 22 and 23,

   - Column 22 : Scanner axial position (first single)
   - Column 23 : Scanner angular position (first single)

What exactly does gate mean by "scanner axial position and angular
position"? I got all of them to be 0.000e+00 for all coincidence counts.
Just do not know why.

2. Also, the second column is the "ID of the event". What does "event" mean
here? Does it just mean coincidence event? Therefore, true coincidence event
should have the same event ID?

Thanks,

Qiyong Fan