[Gate-users] Ge68 source

[xcao]

hi，Marc!

You suggestion give me much help and understanding. I'll test GateLab, hope it will work.

Just as you say, for Ge-68, electron capture branching rations is included. But there are still something confused me.
I change the verbose to get more information of output, and find that, for Ge-68, it will produce Ga-68, but Ga-68 will not decay,
I can't understand why? In the attachment is the out of Ge-68 source and pure Ga-68 source.

Another question is, whether can I put the enengy spectrum produced by "ion source" of Ga-68 into the Gate code of source/physics/src/GateSPSEneDistribution.cc,  the use a new energytype? This will also can save simulation time.

Thank you very much!

Shelley!


2012-08-31 



xcao 



发件人： Marc Chamberland 
发送时间： 2012-08-30  20:58:42 
收件人： xcao 
抄送： gate-users at lists.opengatecollaboration.org 
主题： Re: [Gate-users] Ge68 source 
 
(Re-sent to include the Gate Users mailing list.) 


Hi Shelley! 


According to the Geant4 9.4 Physics Reference Manual, electron capture is included in radioactive decay (look at Chapter 37 in the PDF) : http://geant4.web.cern.ch/geant4/UserDocumentation/UsersGuides/PhysicsReferenceManual/BackupVersions/V9.4/fo/PhysicsReferenceManual.pdf


Also, if you look at the RadioactiveDecay data file for Ge-68 (z32.a68), you'll see the electron capture branching ratios is included.


As for the simulation time, my first suggestion would be to use the cluster tools included with Gate. If you don't have access to a computer cluster, maybe you can check if GateLab would work for you: http://www.opengatecollaboration.org/GateLab


Also, I'm no expert in PET, but couldn't you do attenuation correction simply with a back-to-back gamma source instead? This would be way faster. Of course, for your actual PET simulations you would use a more realistic source.


I hope this helps!


Marc






__________________________


Marc Chamberland, MSc
PhD candidate
Department of Physics
Carleton University
Ottawa (ON)


Le 2012-08-30 à 8:56 AM, Marc Chamberland <MarcChamberland at cmail.carleton.ca>
 a écrit :


Hi Shelley! 


According to the Geant4 9.4 Physics Reference Manual, electron capture is included in radioactive decay (look at Chapter 37 in the PDF) : http://geant4.web.cern.ch/geant4/UserDocumentation/UsersGuides/PhysicsReferenceManual/BackupVersions/V9.4/fo/PhysicsReferenceManual.pdf


Also, if you look at the RadioactiveDecay data file for Ge-68 (z32.a68), you'll see the electron capture branching ratios is included.


As for the simulation time, my first suggestion would be to use the cluster tools included with Gate. If you don't have access to a computer cluster, maybe you can check if GateLab would work for you: http://www.opengatecollaboration.org/GateLab


Also, I'm no expert in PET, but couldn't you do attenuation correction simply with a back-to-back gamma source instead? This would be way faster. Of course, for your actual PET simulations you would use a more realistic source.


I hope this helps!


Marc






__________________________


Marc Chamberland, MSc
PhD candidate
Department of Physics
Carleton University
Ottawa (ON)


Le 2012-08-30 à 3:54 AM, xcao <xcao at mail.ihep.ac.cn>
 a écrit :


hi, Marc!

   Thank you for you reply.
   Yes, using "ion source" will solve this problem, I have tested, but should use Ga-68 instead of Ge-68.
I think the reason maybe the physical process of electron capture is not include. Even so, Ga-68 will be ok.

Another problem is what you have mentioned, using "ion source" will slow down simulations.
I want to using Ge-68 source to do attenuation correction on PET,  this will need plenty of data samples.
So simulation time is also very important. If you have any better suggestion for simulation time.

Thank you very much!
Shelley

2012-08-30



xcao



发件人： Marc Chamberland
发送时间： 2012-08-29  21:15:54
收件人： xcao
抄送： gate-users at lists.opengatecollaboration.org
主题： Re: [Gate-users] Ge68 source
Hi!
You can define a Ge-68 source in Gate by using the "ion source" type. See the documentation here: http://wiki.opengatecollaboration.org/index.php/Users_Guide_V6.1:Source#Defining_the_type_of_source
So for Ge-68, you would do it like this:
/gate/source/NAME/gps/particle ion 
/gate/source/NAME/gps/ion 32 68 0 0 
/gate/source/NAME/gps/monoenergy 0. keV 
/gate/source/NAME/setForcedUnstableFlag true 
/gate/source/NAME/setForcedHalfLife 23410080 s
You also need to add the RadioactiveDecay process in your physics list (before initialization):
/gate/physics/addProcess RadioactiveDecay
Note that using an ion source will slow down your simulations.
Cheers!
Marc
__________________________
Marc Chamberland, MSc
PhD candidate
Department of Physics
Carleton University
Ottawa (ON)
Le 2012-08-28 à 10:40 PM, xcao <xcao at mail.ihep.ac.cn>
 a écrit :
> hello, gate-users
> 
>    If anyone have used the source of germanium-68, I want to know how to define it.
> Can anyone offer me some help.
> 
> Thank you very much! 
> 
> 2012-08-29 
> 
> 
> 
> xcao 
> _______________________________________________
> Gate-users mailing list
> Gate-users at lists.opengatecollaboration.org
> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
> 
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