[Gate-users] Coincidence Window

[Marc Chamberland]

Hi Taro!

I'm not sure about Gate v5, but in v6.1, there is a constant called MIN_COINC_OFFSET defined as 500 ns in the file [your Gate installation]/source/digits_hits/include/GateCoincidencePulse.hh Then, in [your Gate installation]/source/digits_hits/src/GateCoincidenceSorter.cc (line 150), there is a line where it checks if your coincidence window is smaller than MIN_COINC_OFFSET / 4.

So, this is a limitation in the source code of Gate. You could try modifying either the MIN_COINC_OFFSET or the check in GateCoincidenceSorter, then recompiling Gate.

However, I don't know the reason for this MIN_COINC_OFFSET and I don't know if changing the value will cause problems or not. Maybe someone can explain the reasoning behind this MIN_COINC_OFFSET and why it's needed?

Good luck!
Marc



__________________________


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

Le 2012-02-16 à 5:29 AM, dankemori at yahoo.co.jp a écrit :

> Hello
> I'm a user of Gate v5.
> I have a problem about　defining a coincidence window.
> I want to define it 400ns, in order to getting random coincidence on purpose.But when I start running, I get following error message.
> "Coincidence window (4e-07 sec) should be smaller or equal to 1.25e-07 sec Goodbye"
> I tried same defining at Long Coincidence.But I also get same message.
> 
> What should I do?
> 
> Thank you.
> 
> Taro
> ====================Taro Kanamaru
> Tohoku University ,Japan
> ====================
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