[Gate-users] Differences in coincidence sorting between GATE 7.2 and 8.0?

Bryan McIntosh mcintoshster at gmail.com
Tue Jun 13 23:40:01 CEST 2017


Hi everyone,

I've been running some benchmarks using the GPU accelerated PET example in
GATE 7.2, and was eager to try them out in GATE 8.0 since it was the latest
release. However, upon installing 8.0 with Geant4 10.3 and ROOT 5.34 I
found that the spatial distribution of coincidence events was different in
ROOT than what I was seeing in GATE 7.2. I ran a short CPU-only simulation
to verify, and it looks like the coincidence events are shifted spatially
toward the scanner's left side (-X direction); see the attached
GATE_72_globalPosX1.png and GATE_80_globalPosX1.png to see an example of
the differences.

Upon further investigation the Singles event tree in ROOT appears to have
very little difference, as does the source position of each event (see
attached .png files).

I have uploaded a .zip file containing the original ROOT files to my
Microsoft OneDrive (https://1drv.ms/u/s!Al3r4ajL5Z4jj7MtNx8KKg1F7E07Bw), as
well as ROOT files generated using GATE 8.0 with Geant4 10.2 and GATE 8.0
with Geant4 10.3 and ROOT 6.x to test if it was an issue with different
Geant4 versions or different versions of ROOT.

Based on the Singles distribution, I am led to believe that the results
from GATE 8.0 are more correct than those from GATE 7.2. But, what does the
rest of the community think? Has anyone else run into this issue?

Cheers,

-Bryan
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