GateContrib-mastes-Benchmark-imaging-CT-classic - benchmarkCT.root File Works Normally, but benchmarkCT_000.dat Projection File Is Empty (All Zeros) #104
Description
I hope this message finds you well! I'm encountering a confusing issue while running the Classic CT benchmark from the official GateContrib repository, and I’d greatly appreciate your insights.
Environment Details
Gate version: 9.4.1
Geant4 version: 11.3.0
ROOT version: (e.g., 6.26/06)
OS: Ubuntu 22.04 (running on VirtualBox)
Benchmark source: GateContrib-master/imaging/CT/classic
Issue Description
When I run this command（Gate benchmarkCT.mac） in the directory（/GateContrib-master/imaging/CT/classic/ ）with the default output.mac , the simulation completes without obvious errors, but there’s a critical inconsistency:
（1）The generated ROOT file (benchmarkCT.root) works perfectly: it contains valid Hits/Singles data (verified via ROOT browser), which confirms that particles are hitting the detector and the core simulation flow is functional.
（2）However, the output projection file (benchmarkCT_000.dat, generated by the imageCT actor) is always empty—all values are zero when checked with MATLAB/Python, and the pixel count statistics show no non-zero entries.
The simulation output results of Gate are as follows:
entering [GateToImageCT::RecordBeginOfRun]
FrameID = 0
leaving [GateToImageCT::RecordBeginOfRun]
WARNING: Scene "none" not found.
/vis/scene/list to see scenes.
entering [GateToImageCT::RecordEndOfRun]
--> Image written to the raw file benchmarkCT_000.dat
leaving [GateToImageCT::RecordEndOfRun]
WARNING: command "/vis/viewer/update" could not be applied: no current viewer.
[Acquisition-0] Slice 1 from 90 to 180 s [slice=90 s]
entering [GateToImageCT::RecordBeginOfRun]
FrameID = 1
leaving [GateToImageCT::RecordBeginOfRun]
WARNING: Scene "none" not found.
/vis/scene/list to see scenes.
entering [GateToImageCT::RecordEndOfRun]
--> Image written to the raw file benchmarkCT_001.dat
leaving [GateToImageCT::RecordEndOfRun]
WARNING: command "/vis/viewer/update" could not be applied: no current viewer.
User simulation time (sec) := 44.66
Real simulation time (sec) := 54.266
System simulation time (sec) := 0.26
[Core-0] End of macro benchmarkCT.mac
GateOutputMgr deleting...
Graphics systems deleted.
Visualization Manager deleting...