[Gate-users] Coincidence problem when setting the repeat number of ring to 2

[Bryan McIntosh]

Hello there,

The reason that you are not seeing any coincidences is that the
coincidence processor needs to see a minimum difference between the
rsector volumes that events are detected in before labelling two
Singles as a Coincidence event. The default minimum value is 2, and
likely was set that way. You will need to change the line in the
digitizer section of the macro to read

/gate/digitizer/Coincidences/minSectorDifference 1

This should solve the problem you are having!

Best regards,

-Bryan

On Tue, Jun 11, 2013 at 5:00 AM,
<gate-users-request at lists.opengatecollaboration.org> wrote:
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 10 Jun 2013 23:04:48 +0800 (GMT+08:00)
> From: ?? <chenze at impcas.ac.cn>
> To: gate-users at lists.opengatecollaboration.org
> Subject: [Gate-users] some coincidence problem when setting the repeat
>         number of ring by number of 2
> Message-ID: <14dd0b6.e173.13f2e9e3720.Coremail.chenze at impcas.ac.cn>
> Content-Type: text/plain; charset="gbk"
>
> Hi,
>      I am trying to simulate the detetor with dual head geometry,
>      so i modify the PET_Cylindrical_System macro nothing but the repeat number of ring from 4 to 2.
>      But someting strange happens, when using "4", everything seems ok, the coincidence tree had data in it,
>      when using "2", the coincidence tree is empty,  seems nothing filled into the coincidence tree.
>      But it should behave that way. Can anyone give me some advice?
> regards,
>
>
>
>
>
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