[gate-users] cylindricalPET

[Fernando Rannou]

a setting of 1 will give you valid coincidences. It means
that if one single hits detector (rsector) 0 and the other 
single hits detector 1 then it is valid coincidence. And also
greater differences will be valid. 

Block is rsector in cylindricalPET.

Fernando


On Tue, 2005-07-19 at 13:51 -0600, Yun Dong wrote:
> Thanks Yuxuan and Fernando. Just now I set the minSectorDifference as 
> 1, then I got the coincidence output file. But as what Fernando said, 
> coincidences under setting 1 are maybe not valid. I feel confused 
> about this configure. What's "block" mean? Does its meaning depend on 
> the setting of "readout/setDepth"? Thanks.
> 
> Yun
> 
> ----- Original Message -----
> From: Fernando Rannou <rannou at diinf.usach.cl>
> Date: Tuesday, July 19, 2005 9:20 am
> Subject: Re: [gate-users] cylindricalPET
> 
> > That's pretty good.  I actually found that there is a typo
> > in the User's guide on page 96. The coincidences will be valid
> > if the difference in block numbers is greater than or equal to 2,
> > not just greater than. Because otherwise if you set to 1 you
> > would still not get any coincidences and a value of 0 is not
> > allowed.
> > 
> > Fernando
> > 
> > 
> > On Tue, 2005-07-19 at 13:43 -0500, yuxuan.zhang at di.mdacc.tmc.edu 
> > wrote:> 
> > > Hi, 
> > > 
> > > I think this is because you only have two rsectors defined in the
> > > cylindricalPET system. 
> > > And for the coincidences sort, it will reject the coincidencs 
> > between> neighbour rsectors. 
> > > you should change the vaule by set: 
> > > /gate/digitizer/Coincidences/minSectorDifference [number] 
> > > The default [number] is 2. and for your system, the [number] 
> > should be
> > > 1. 
> > > 
> > > See the manual  8.2.13. Coincidences sorter. 
> > > 
> > > 
> > > yuxuan 
> > > 
> > > 
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