[Gate-users] Particle ID in root

[David Sarrut]

Hello Leila,

On Wed, May 29, 2013 at 9:22 AM, Joulaeizadeh, (L) , Mrs <
LJoulaeizadeh at vsl.nl> wrote:

> Dear David and Yann,****
>
> Sorry to contact you directly, I asked these questions on the gate-users
> and nobody knew the answers, I thought maybe you missed those posts.
>

yes it is always better to post to the mailing list.

> 1-      **So far in the proton spot scanning it seems  possible to
> simulate dose delivered to a set of predefined beam spots. The problem is
> that the primary particle are randomly put in a beam spot and therefore it
> is not possible to score the dose distribution as a function of time,
> unless one chooses to simulate spot by spot which is very time consuming. I
> was wondering whether you have a solution for this. I simulated once two
> different spots in one filed and another time two fields each containing
> one spot. But in none of the cases the beam is delivered per spot.
>

yes, it was chosen to randomly pick a spot : it allows to stop the
simulation at any time without bias. It is very convenient. However, you
are right, if you are interested in spot by spot dose, it cannot be done
that way.

the solution is to make some modification to the code
of GateSourceTPSPencilBeam.cc. Probably in the GenerateVertex function. You
also need to code a way to determine how many proton you want by spot.


> ****
>
> ** 2-      **In analyzing the phase space data, I would like to select a
> specific particle like electron and look at the energy distribution of that
> particle. How can I select a particle using particle ID? I tried
> ParticleName==2 or 11 or e- but none of them work.
>
the ParticleName is in fact the particle type ("e-" or "gamma"). If I
understand correctly, you need the ID of the particle. For that you need
both the TrackID and the EventID. Those both information are not included
in the 6.2 version, but are in the development version (will be available
soon).
see  http://thread.gmane.org/gmane.comp.science.opengate.user/2925
and
http://thread.gmane.org/gmane.comp.science.opengate.user/2972

David

>
> Thanks for your time.****
>
> Leila****
>
> <http://www.hollandmetrology.nl>
>
>
>
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>
>  VSL
>
>  Mrs (L) Joulaeizadeh PhD
>
>  Research Scientist - Ionizing Radiation Standards
>
>  D +31 15 2691681
>
>  T +31 15 2691500
>
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>
>  www.vsl.nl
>
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>


-- 
David Sarrut, Phd
Chargé de recherche CNRS
CREATIS, UMR CNRS 5220, Inserm U 1044
Centre de lutte contre le cancer Léon Bérard
28 rue Laënnec, 69373 Lyon cedex 08
Tel : 04 78 78 51 51 / 06 74 72 05 42
http://www.creatis.insa-lyon.fr/~dsarrut
_________________________________
 "2 + 2 = 5,  for extremely large values of 2"
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