[Gate-users] Empty gateCoincidences.dat in PETscanner

[Priegnitz, Marlen]

Dear Natalia,

did you set your minSectorDifference correctly?
Per default it is set to 2, if I remember well. But if you use a PETscanner 
with only two heads, you have to set it to 1.
Here is the command:

/gate/digitizer/Coincidences/minSectorDifference 1

As far as I know and experienced, the PETscanner system does support the 
coincidence output.

Hope this helps.

Marlen



Am Thu, 15 Jan 2009 12:30:32 +0100 schrieb Natalia Utochkina 
<n.utochkina at fz-juelich.de>:
> Dear GATE users, dear Martin und Marlen,
> 
> In GATE forum from September 2008 I have found emails with the same
> problem, which I have too: Empty gateCoincidences.dat in PETscanner System
> 
> Martín Belzunce wrote:
> 
>> >// Dear Gaters,
>> /
> //>/ I am having a problem in my simulation of an hexagonal PET scanner. I
> />/ am using the PETscanner system, that unfortunatly I haven't found many
> />/ information about it. I insert a coincidence sorter with it's Window
> />/ time. But after I run gat, the file gateCoincidences.dat is created
> />/ but empty.
> />/ I found a previous entry in this list about the same inconvinient, but
> />/ I couldn't find any possible answer.
> />/ Any help will be appreciated.
> />/ Best Regards,
> />/ Martín Belzunce/
> 
> and this one:
> 
> Hello Marlen,
> I have created a hexagonal PET scanner of NaI, using the PETscanner
> system. I am attaching the macro-file that I am running.
> Although I am setting the flag to enable both ASCII and ROOT
> Coincidence outputs, I get an empty file gateCoincidences.dat. The
> file is created but it´s empty.
> I processed the Singles file with Matlab, and I have plenty of
> Coincidence Events.
> I have checked that I am including the Coincidence Sorter in the
> digitizer. Even more, I have run simulations of a similar PET  scanner
> using the CylindricalPET sytem and I get a full gateCoincidences.dat
> file. That´s why I suspect that there is a conflict in the way I use
> the Coincidence Sorter for a PETscanner system.
> 
> Thanks in advance.
> Best Regards,
> Martín Belzunce/
> 
> I am trying to simulate the simple case of the PETscanner to compare
> this with the
> experimental setup. My PETscanner consists of 2 opposing detectors.
> There is the
> PVC-cylinder between this detectors. I have set the flag 1 to enable
> ASCII and ROOT
> outputs for coicidences. The file gateCoincidences.dat was created, but
> it was empty.
> Then I have included the CoincidenceSorter (with multiplePolicy), but
> anyway it didn't
> work ...With CylindricalPET there are no problems to get Coincidences
> simulating the
> whole ring of detectors. Does anybody know how I can simulate
> coincidences in
> PETscanner-system? Does GATE support the coincidence output under
> PETscanner?
> 
> Many thanks for your help
> 
> 
> 
> 
> 
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