[Gate-users] Σχετ: Problem with GPU PET example

[Constantinos P. Chatzipapas, MSc]

Hello,
I use GATE in GPU for PET imaging. So I want to ask you, if we reconstruct the image (root file) that is extracted, without changing the code, will we produce the real source or just the box seen in root?
Thank you in advance,Konstantinos
 -----------------------------------Konstantinos Chatzipapas
Medical Physicist, MSc
University of Patras
email: con at physicsmag.comweb page: www.physicsmag.com 

    Στις 6:16 μ.μ. Τετάρτη, 11 Ιανουαρίου 2017, ο/η Liliana Caldeira <llcaldeira at gmail.com> έγραψε:
 

 Hi Mirco,

The GATE GPU version does not save the source position, but only the position when it leaves the voxelized phantom, thus why you only see the faces of the phantom. 
If you are really interested in the source positions, then you can change the GPU code to output that information to a file (although it might be very large txt file). 
In the file GateEmisTomo.cc:

kernel_voxelized_source_b2b<<<grid, threads>>>(gamma1_d, gamma2_d, activities_d, E,
                                                   phantom_d.size_in_vox, phantom_d.voxel_size);
    cudaThreadSynchronize();
    printf(" ::   Generation ok\n");
PRINT INFO HERE: gamma1_d.eventID gamma1_d.px gamma1_d.py gamma1_d.pz

Cheers,
Liliana
Forschungszentrum Jülich GmbH


On 10 January 2017 at 14:11, Mirco Heß <mirco.hess at uni-muenster.de> wrote:

Hi all,
I am trying to run the GPU PET example but am facing some problems. When looking at the output, it seems like the XYZ positions of the source are accumulated on the faces of the provided phantom/source volume, i.e. the bounding box of the 3D image. This is only true for the GPU-based simulation. When running the CPU-based simulation everythig seems to be fine. I have attached two screenshots to visualize the problem and the difference between the two cases. The problem is present in both the ASCII and ROOT output.
I already had this problem about two years ago with Gate 7.0 and was not able to resolve it.Now I am running Gate 7.2 with GPU support activated, on Ubuntu 14.04 with updated NVIDIA and CUDA drivers. 

Has anybody been able to successfully run this example?  (gate_v7.2/examples/ gpumacros/pet/main-gpu.mac)
Any advice and pointers to resolve this issue would be highly appreciated. Thanks a lot in advance!

Cheers, Mirco

-- 
Mirco Heß
 PhD Candidate
 European Institute for Molecular Imaging (EIMI)
 European Institute for Molecular Imaging - EIMI
 Waldeyerstr. 15
 48149 Münster
 http://www.uni-muenster.de/ eimi
 
 +49 (0)251 83 - 49318
 +49 (0)251 83 - 49313 (Fax)
 eMail: mirco.hess at uni-muenster.de
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