How to acquire delay coincidences from GATE root output?

Usage Questions
1

Hi there,

I have been recently trying to reconstruct images from my own GATE-simulated dataset based on the GATE listmode TOF tutorial for PET image reconstruction. However, while the data you provided in the tutorial do include the key delay for the gate.get_detector_ids_from_root function to read the delay coincidences, ROOT output of GATE simulation does not seem to have a flag that can enable delay recording (I am relatively new to GATE simulation as well). Sorry that this question may be a little irrelevant to PyTomography itself. Could anyone help with this problem?

Thanks

2

Hi,

For you to enable the delay recording on GATE you have to first define this parameter on the digitizer (3. Digitizer and readout parameters — GATE documentation). You use these type of commands:

/gate/digitizerMgr/name delay
/gate/digitizerMgr/insert CoincidenceSorter
/gate/digitizerMgr/CoincidenceSorter/delay/setInputCollection Singles_BGO
/gate/digitizerMgr/CoincidenceSorter/delay/setWindow 10. ns
/gate/digitizerMgr/CoincidenceSorter/delay/setOffset 500. ns

Then, on the output root you enable that data to be saved like this:

/gate/output/root/enable
/gate/output/root/setFileName YourFile
/gate/output/root/setRootHitFlag 0
/gate/output/root/setRootSinglesFlag 1
/gate/output/root/setRootCoincidencesFlag 1
/gate/output/root/setRootdelayFlag 1