[Gate-users] cold region

[Patay Gergely]

Dear All,

I also encountered this problem while implementing the NEMA IQ phantom.
My solution was this (validated in Gate5):
Suppose that we have a hot volume Hot_P, which also has two embedded 
(i.e. daughter volume) cold regions Cold1_P, Cold2_P:

/gate/some_mother_volume/name Hot
...
/gate/Hot/daughters/name Cold1
...
/gate/Hot/daughters/name Cold2
...

Define the source distribution with the same geometry than Hot_P, and 
confine it to Hot_P:

/gate/source/addSource HotSrc
...
/gate/source/HotSrc/gps/confine Hot_P

The trick is that Gate will confine it only to Hot_P minus the daughter 
volumes, i.e. the to desired hot volume.

Hope this helps.

cheers,
  Gergely

---
Gergely Patay
  physicist
Mediso Medical Imaging Systems Ltd.
Hungary




> Dear All,
> 
> Is it possible to define more than one cold region with Gate5 ?
> My problem is when I define 2 cold regions in 1 volume, it seems to be  
> ok in a first time :
> 
> Confirming activity forbidden in volume 'cold1_P'...
>   Activity forbidden in volume 'cold1_P' confirmed
> Confirming activity forbidden in volume 'cold2_P'...
>   Activity forbidden in volume 'cold2_P' confirmed
> 
> But when I visualize source position with the visualization source  
> tool and also in root output file, just the last cold source (cold2)  
> is taken into account and not the both.
> 
> Any suggestions appreciated,
> 
> Best regards,
> 
> Nadège Anizan
> Phd student
> INSERM, Nantes
> France