[Gate-users] some coincidence problem when setting the repeat of ring by number of 2 (??)

[Ricardo Capote]

Hi,

Try to add the following line to your "digitizer module":

/gate/digitizer/Coincidences/minSectorDifference 1

This changes the default value of the minimum sector difference for valid
coincidences (default value is equal to 2). When you use only 2 detector
heads the difference between sectors for valid coincidences will be always
equal to 1.
For cylindrical systems (with 4 or more heads) this option allows you to
choose to save only the coincidences that were detected in opposite
detectors (minSectorDifference 2, for 4 head geometry) and not those that
were detected in adjacent detectors (minSectorDifference 1).

-------------------------------------------------------------------
Ricardo Capote

Institute of Biophysics and Biomedical Engineering
Faculty of Science, University of Lisbon
Campo Grande
1749-016 Lisbon

Tel. + 351 21 750 01 77; Fax: + 351 21 750 00 30
Extension: 20510
Email: rmcapote at fc.ul.pt
Website: http://www.ibeb.fc.ul.pt/


2013/6/11 <gate-users-request at lists.opengatecollaboration.org>

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>    1. some coincidence problem when setting the repeat number of
>       ring by number of 2 (??)
>
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> ----------------------------------------------------------------------
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> 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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