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Forum: Hadronic Processes
Re: Question Hadrontherapy::Bragg Peaks above 200MeV Proton (Rivas Javier )
Re: Idea Re: Hadrontherapy::Bragg Peaks above 200MeV Proton (G.A.P.Cirrone)
Date: 11 Mar, 2010
From: G.A.P.Cirrone <G.A.P.Cirrone>

On Thu, 11 Mar 2010 22:24:53 GMT, G.A.P.Cirrone wrote:
> On Thu, 11 Mar 2010 19:04:00 GMT, Rivas Javier wrote:
> 
> > Hallo everyone,
> > 
> > At this momment, Im tryinng to work with tutorial Handrontherapy (in the
> > Geant4.9.3 environment),
> > 
> > but when I try to change (only) the energy mean from 63 to 200
> > MeV@Proton , the results (the Dosedistribution) show me a Platteu region
> > Can you say me, what is wrong ? Do i have to change other parameters as
> > well?
> > 
> >    Attachment:
> >       http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2010/03/11/11.01-16572-000p01818d.jpg
> > 
> 
> Dear Javier,
> 
> the problem of your result is probably related to the dimensions of the
> phantom you are using to collect the dose. The default dimensions of the
> phantom are 40 x 40 x 40 mm that are optimal for proton beams of energy
> not greater then 70 MeV.
> 
> In the file macro/detectorGeometry.mac you can find messenger to change
> the position, the dimensions and the number of the voxels of the
> phantom. Moreover take in mind that the output file gives the number of
> the slice (or voxel) and not the depth. So you have to convert to obtain
> a depth depending on the slice dimension you are using.
> 
> Hoping this can help,
> 
> Pablo Cirrone
> 

I forgot another point: what you are plotting is an histogram defined with a wrong range for you energy (but good for the 70 MeV). Please give a look in the AnalysisManager file and in the characteristics of the used histogram.

regards, Pablo Cirrone

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1 Ok: Re: Hadrontherapy::Bragg Peaks above 200MeV Proton   (Rivas Javier - 11 Mar, 2010)
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