[Gate-users] CylindricalPET inside a large lead box or cylinder ?

[Sanae Rechka]

Hi Simon,

Thank you very much for your answer,

- But if we define the world material to lead, can we record Hits in the world
material ?  even If Gate only stores hits for those volumes attached to a
sensitive detector and belonging to a system.  And system should be one of the
systems defined in page 48 of the Gate users Guide (which mean CylindricalPET,
SPECT, ECAT, etc...) ?????

- for the second solution : to define a big lead box over your CylindricalPET,
in lead your gammas will be stopped before traversing one mm ! so they won't
escape from your box and you will not be able to see them after.

This is Ok, it's what I need. But can we record Hits in the Box over the scanner
? because according to the GATE users Guide we can only record Hits in volumes
belonging to the scanner ? isn't it ?



Sanae










Selon Simon Stute <gate.stute at gmail.com>:

> Hi,
>
> 2008/1/24, Sanae Rechka <Sanae.Rechka at usherbrooke.ca>:
> >
> >
> > Dear Gate users,
> >
> > Is it possible to place the CylindricalPET inside a large lead box or
> > cylinder
> > to store the energy of photons outside the scanner (photons which escape
> > from
> > the scanner)?
>
>
> One possibility is to define the world material to lead, an other is to
> define a big lead box over your CylindricalPET, but there is no interest to
> do such a thing because in lead your gammas will be stop before traversing
> one mm ! so they won't escape from your box and you will not be able to see
> them after. I don't really see a solution to your investigation at the
> moment but if I have an idea, I will send you (but I think this is not
> possible without modifying the gate source code and even the geant4 source
> code !)
>
> Good luck !
> Simon
>
> Of course, I am aware of this :
> >                           Gate only stores hits for those volumes attached
> > to a
> > sensitive detector. A volume must belong to a system before it can be
> > attached
> > to a sensitive detector.  And system should be one of the systems defined
> > in
> > page 48 of the Gate users Guide. I'm aware of that.  And it's why I'm
> > asking....
> >
> >
> > Can any body answer my question please ?
> >
> > Thank you very much in beforehand
> >
> >
> > Sanae
> >
> >
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> >
>