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Forum: Medical Applications
Re: Question Is this acceptable Bragg peak for hadronTherapy example? (Morad Hamad)
Date: 25 Feb, 2010
From: G.A.P.Cirrone <G.A.P.Cirrone>

Dear Morad,

in the comparison you should understand what exactly is represented in the x and y axis; in the attached plots, in fact, is not clear which are the units of the X-scale, especially for the simulation results.

Please, can you be more precise and describe better what you are doing? Is the phantom voxelized or constructed in slice? which are the dimension of the voxels/slices?

As far as I can argue from your plots, most probably you are representing the "slice number" in the Geant4 plot and, probably, you are using a phantom with a slice of 0.2 mm. In such a case, in fact, the range of the peak will result about 30 mm (close to the experimental one).

To better understand things (and how conversion between voxels and depth is done) you should give a look into the /RootScripts/proton/BraggPeak/comparison.C script.

Regards, Pablo CirroneOn Thu, 25 Feb 2010 09:12:38 GMT, Morad Hamad wrote:

> Dear all,
> When I try to generat an ASCII data file For hadron therapy example and
> produce a bragg beak I get the folloing figure:
> 
> please see the attached file...
> 
> this figure drawn without any fitting, but it seems to me that there is
> some thing wrong specially in the scale compre to experemintal data from
> the same example which is also attached
> 
> please have a look to the figure and the data file
> 
>    Attachment:
>       
> http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2010/02/25/01.03-42355-Graph2.PDF
>       
> http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2010/02/25/01.03-57316-BraggPeak.dat
>       
> http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2010/02/25/01.07-63690-Graph7.PDF
> 

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