1. Part II Status of GATE-related projects (Clermont-Ferrand; May 2017)
Mirjam Lenz
Liliana Caldeira & Uwe Pietrzyk
Institute of Neurosciences and Medicine (INM), Research Center Juelich, Germany
School of Mathematics and Natural Sciences, University of Wuppertal, Germany

2. List of Activities  FZ-Jülich / Uni Wuppertal
Mirjam Lenz, PhD - Candidate
Extracting DOI-Information for Optical Photons

3. List of Activities  FZ-Jülich / Uni Wuppertal
Mirjam Lenz (PhD student, since Nov. 2015):
Design of novel three-crystal-layer PET-detector as part of a new BrainPET-insert
Studying sensitivity of different designs
Simulation of scintillation process and tracking of optical photons in crystal arrays/lightguide
Dedicated readout module for digitiser (work in progress, collaboration with C. Morel and M. Dupont, CPPM Marseille)
Access to scintillation coordinates implemented (=DOI information)
Stored in ROOT output: sourcePosX, sourcePosY, sourcePosZ, distinctive sourceID for optical photons, e.g. -5
No increase in computation time observed
 Flood maps of three-layer detector module calculated and studied

4. Mirjam Lenz (PhD student):
Open question: Future work on optical photons
Idea: dedicated module for PET scanners (application and setup differ a lot from bioluminescence example!!)
Problem: computing time increases kind of exponentially with crystal array size and especially number of layers!
Obvious: GATE is not dedicated to these setups  inefficient implementation?
Now: Simulating crystals instead of
Singles output only (Hit output not feasibile)
on JURECA: > core hours necessary for full size  too expensive!
6x7
7x8
8x8
22x23
23x24
24x24

5. Some General Suggestions TO be further discussed in the
Steering Committee:

6. Mailing list: ‚template‘
Problems: many s about operating system, Gate, Geant4, root version,…
Small and not reproducible code snippets sent

7. If you post to the mailing-list, please fill, copy and paste the following table to your email:
Operating system:
Gate version:
Geant4 version:
Root version:
and – if possible – attach a full minimal working example to your , so that other users can reproduce the problem.
Extend it slightly...

8. Problem with TrackerDetector under GATE-7
Problem with TrackerDetector under GATE-7.2 from March 2, 2017 / Hancong Xu
Hello. I encounted a problem when I tried to execute the example macro of Tracker Detector mode in GATE v7.2. The error information is explained below. 
To put it in a simple way, I think the GATE v7.2 can not terminate the simulation in the Detector mode and always tries to seek more files to open. So is there any easy approach to solve this problem for v7.2? Many thanks!
GATE Version 7.2
GATE macro: example_TrackerDetector
When executing the Tracker model, it pops the error when the program finishes:
"WARNING - Attempt to delete the physical volume store while geometry closed !
WARNING - Attempt to delete the logical volume store while geometry closed !
WARNING - Attempt to delete the solid store while geometry closed !
WARNING - Attempt to delete the region store while geometry closed !
GateToRoot::RecordEndOfAcquisition(): Failed to access to 'total_nb_primaries' histogram to fill it !"
When excuting the Detector model, the program goes to the endless loop. After interpreting the program, the error is :
"GateSource::GeneratePrimaries   End of Tracks Root file reached ... Seeking for more files to open.
 GateSource::GeneratePrimaries   End of Tracks Root file reached ... Seeking for more files to open.
Session terminated.
EEEE G4Exception-START EEEE
*** G4Exception : UI0001"
The file created by Tracker mode is 234 Mb and for Detector mode is 322 Kb. But there is some useful simulated data in both files. So I think the simulation works for v7.2, but can not be terminated properly.
If we execute the same script of Tracker mode on GATE Version 7.1, there is no error popped out like v7.2. And The Detector mode can be executed and terminated in the right way with a output of 322 Kb as well. However, there is till some error message.
[Acquisition-0] Slice 1 from 1 to 1 s [slice=0 s], final stop at 1 s.
 <!> *** WARNING *** <!>  Warning in GateApplicationMgr::GetTimeSlice, run=1 is greater than the list of slices. Do nothing
[Acquisition-0] Slice 2 from 1 to 0 s [slice=0 s], final stop at 1 s.
 <!> *** WARNING *** <!>  Warning in GateApplicationMgr::GetTimeSlice, run=2 is greater than the list of slices. Do nothing
GateApplicationMgr.cc (l.218): Error in GateApplicationMgr::GetTimeSlice, run=2
WARNING - Attempt to delete the physical volume store while geometry closed !
WARNING - Attempt to delete the region store while geometry closed !"
Thus we can see v7.1 and v7.2 have the similar simulation results. But both have some errors in the problem, which might need to be fixed.

9. The EduGATE Lecture Book – Using GATE exposing Physics
Introduction
From Decay to Detection
Sources – the Origin of Particles and Radiation [*Spectro]
Ion-Sources – Radioactive Decay
Gamma Sources, single or back –to– back
Electrons and Positrons
High Activity and Short simulation vs Low Activity and Long Simulation
Sources – Shapes, Materials, special: intrinsic radioactivity
[* existing module]

10. The EduGATE Lecture Book – Using GATE exposing Physics
Physical Effects – The Basis for Interaction and Detection [*Cerenkov, Attenuation, *MR_PET, *Spectrometry_Gamma]
Photoelectric-Effect, Compton-Effect, Pair-Production
Bremsstrahlung
Ionization
Cerenkov-Effect
Basic Elements of a Radiation Detector – From a single Channel to a full Imaging System [*Coin_Chan, *Gamma_Camera, *SPECT_to_Reco, Readout_Digitizer, Optical Photons]
Monte Carlo as a Method: Where are the Limits? – A Critical Reflection [CPU vs. GPU]
[* existing module]

11. Contact
Prof. Dr. Uwe Pietrzyk
Institute of Neuroscience and Medicine (INM-4)
- Medical Imaging Physics -
Forschungszentrum Jülich GmbH
and
School of Mathematics and Natural Science
- Medical Physics -
Bergische Universität Wuppertal
Germany