[Gate-users] the geometry of flat panel system

[cindy Dong]

Hi,
   Yesterday i defined two boxes as the flat panel system of PETscanner,then
i got nothing in the gateCoincidences.dat.Just now,i defined a cylinder ,set
Rmax&Rmin to make it big enough to insert the flat panel,then i got what i
want.So i have some questions .Must it be a cylinder for PETscanner
system?Why it shouldn't two boxes?Only after that can i define
level1,level2...?

Thanks,
Best regards.
Cindy