[Gate-users] Gate-users Digest, Vol 125, Issue 15

khadidja Ouabri khadidjaphysique at live.fr
Wed Oct 19 23:41:34 CEST 2016 

Bonjour ,

SVP pouvez vous m'aider,?? ,,comment ou avec quoi je peux ouvrir un fichier .mhd

merci d'avance

cordialement

________________________________
De : Gate-users <gate-users-bounces at lists.opengatecollaboration.org> de la part de gate-users-request at lists.opengatecollaboration.org <gate-users-request at lists.opengatecollaboration.org>
Envoyé : mercredi 19 octobre 2016 17:49:56
À : gate-users at lists.opengatecollaboration.org
Objet : Gate-users Digest, Vol 125, Issue 15

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Today's Topics:

   1. error reading particle type (tony youness)
   2. Re: error reading particle type (REUZE SYLVAIN)
   3. Difference between simulated and experimental LOR in      inveon
      (Santos, Roque)


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Message: 1
Date: Wed, 19 Oct 2016 13:54:20 +0000
From: tony youness <tony_youness at live.com>
To: "gate-users at lists.opengatecollaboration.org"
        <gate-users at lists.opengatecollaboration.org>
Subject: [Gate-users] error reading particle type
Message-ID:
        <VI1PR0701MB23024A681B3DA795551B22C698D20 at VI1PR0701MB2302.eurprd07.prod.outlook.com>

Content-Type: text/plain; charset="utf-8"

Dear GATE users,

I'm running gate for external radiotherapy applications for high energy
photon beams. I recently tried to create a new IAEAphsp file after the
jaws of a simulated Linac in order to reduce computation time. When I
try to run a new simulation with the created phase space file, I get the
following error multiple times at the end of each simulation:

ERROR: read_particle: Failed to read particle type

  ERROR: read_particle: Failed to read particle type

  ERROR: read_particle: Failed to read particle type

...


As i understand that a photon ID is represented by the number 1. When I
tried to read the IAEAphsp file, which contains ID, energy, position and
direction of each particle, i recognized that some particles have the ID
-1. In the header file the -1 and 1 are considered as a photon as I
realized. I can't find why I'm getting the negative sign and I'm not
sure if the error is related to the sign, has anyone encountered this
problem before?

I would really appreciate any help or advise,

Best Regards,

Tony


------------------------------

Message: 2
Date: Wed, 19 Oct 2016 14:11:07 +0000
From: REUZE SYLVAIN <SYLVAIN.REUZE at gustaveroussy.fr>
To: tony youness <tony_youness at live.com>,
        "gate-users at lists.opengatecollaboration.org"
        <gate-users at lists.opengatecollaboration.org>
Subject: Re: [Gate-users] error reading particle type
Message-ID:
        <B3429882877FFB44A20845EC89FF2991F69327FE at SRV-MBX-01.intra.igr.fr>
Content-Type: text/plain; charset="utf-8"

Hello Tony,

I had the same problem with phase spaces coming from IAEA due to these negative IDs, among other things. You can use ROOT format instead of IAEAphsp, which is more compatible with Gate.

Best regards,

Sylvain Reuzé
PhD candidate, Medical Physics, Université Paris-Saclay
INSERM U1030 "Molecular Radiotherapy"
GUSTAVE ROUSSY
Radiotherapy – Medical Physics Department

Tél. : (+0033) 1 42 11 51 54
www.gustaveroussy.fr<http://www.gustaveroussy.fr>





-----Message d'origine-----
De : Gate-users [mailto:gate-users-bounces at lists.opengatecollaboration.org] De la part de tony youness
Envoyé : mercredi 19 octobre 2016 15:54
À : gate-users at lists.opengatecollaboration.org
Objet : [Gate-users] error reading particle type

Dear GATE users,

I'm running gate for external radiotherapy applications for high energy photon beams. I recently tried to create a new IAEAphsp file after the jaws of a simulated Linac in order to reduce computation time. When I try to run a new simulation with the created phase space file, I get the following error multiple times at the end of each simulation:

ERROR: read_particle: Failed to read particle type

  ERROR: read_particle: Failed to read particle type

  ERROR: read_particle: Failed to read particle type

...


As i understand that a photon ID is represented by the number 1. When I tried to read the IAEAphsp file, which contains ID, energy, position and direction of each particle, i recognized that some particles have the ID -1. In the header file the -1 and 1 are considered as a photon as I realized. I can't find why I'm getting the negative sign and I'm not sure if the error is related to the sign, has anyone encountered this problem before?

I would really appreciate any help or advise,

Best Regards,

Tony

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Gate-users mailing list
Gate-users at lists.opengatecollaboration.org
http://lists.opengatecollaboration.org/mailman/listinfo/gate-users

------------------------------

Message: 3
Date: Wed, 19 Oct 2016 17:49:54 +0000
From: "Santos, Roque" <rsantost at vols.utk.edu>
To: "gate-users at lists.opengatecollaboration.org"
        <gate-users at lists.opengatecollaboration.org>
Cc: "Ruggles, Arthur E" <aruggles at utk.edu>
Subject: [Gate-users] Difference between simulated and experimental
        LOR in  inveon
Message-ID:
        <DM2PR0201MB09901CFD979A4AD67A63CF2FF0D20 at DM2PR0201MB0990.namprd02.prod.outlook.com>

Content-Type: text/plain; charset="iso-8859-1"

Hello all.

I am validating a GATE model of Siemens Inveon. In order to do this, I am placing a 12.7 mm cube source of Na22 (7uCi at September 2016) at different position along the z axis (depth of the Bore) of the real machine. At these positions I'm taking a 10 second scan and I am using the IAW (inveon software) to create the histogram and the image of the scan. This software creates log files that have the number of singles and the number of LOR (under the name of events). I am comparing this number of events with the number of LOR generated in GATE.

For the simulation I'm using Jen Gregor's Inveon model. I changed the coincidence policy to killAll and the energy widow to 425-625 keV. The last change was done because this is the energy window that we use in our group work. The rest of the model is the same as it is distributed by Dr. Gregor. A brief description of the digitizer features: dead time: depth of response=1, crystal resolution min=0.15 crystal resolution max=0.35, Quantum Efficiency=0.85, Energy reference= 511 keV, dead time= 7000000. ps, coincidence window=3.438 ns.

I am using the standard model for the Photoelectric, Compton and Rayleigh scattering. The standard model is also used for the electron ionization and Bremsstrahlung processes. For the positron annihilation I'm using the eMultipleScattering model and the Radioactive decay is on.

I modeled the source as a point source centered in the cube, and I'm using my own positron distribution (however the results do not change too much when I used the default one).

The results that I got showed that the simulation produces more LOR than the experimental. I'm attaching pictures of this situation

[cid:2f2de02f-72db-46ae-8002-aae003bb2e17][cid:b909bae3-f62d-41fb-adbe-b395655a0dc7]
The first one is the LOR and the second one is the efficiency. Both shows a difference of almost twice. The model that I'm using is a validated model. I looked for other references with the same problem, but so far I just could find one.

Does anybody have an idea of how can I get the same LOR experimental and simulated? or Why is this happening? Any idea will be explored.

Thank you very much for your help.

Greetings,

Roque Santos
University of Tennessee, Knoxville
Departement of Nuclear Engineering


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