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Forum: Medical Applications
Re: Question How to get SOBP output with Hadrontherapy example (Jongseok)
Date: 04 Apr, 2010
From: G.A.P.Cirrone <G.A.P.Cirrone>

On Sun, 04 Apr 2010 07:25:16 GMT, Jongseok wrote:
> Hello! I'm trying to get SOBP output.
> 
> I changed the angle of the modulator whenever I simulated
> proton_therapy.mac
> 
> Like this
> 
> /event/printEventNumber 1000
> 
> /modulator/angle 1 deg
> 
> /analysis/setAnalysisFile deg1.root
> 
> /run/beamOn 1000 /modulator/angle 1 deg
> 
> /analysis/setAnalysisFile deg2.root
> 
> /run/beamOn 1000 /modulator/angle 1 deg
> 
> /analysis/setAnalysisFile deg3.root
> 
> /run/beamOn 1000 /modulator/angle 1 deg
> 
> /analysis/setAnalysisFile deg4.root
> 
> /run/beamOn 1000
> 
> However, I couldn't get SOBP, and it's break peak points are almost
> same!!
> 
> I heard that I should change the angle of the modulator as a function of
> time.
> 
> Is it correct?
> 
> If that is correct, what should I do for getting SOBP output.
> 
> Please give me some advices.
> 
> Thanks.
> 

Dear Jongseok,

Hadrontherapy to collect the total dose released by a beam into the phantom, doesn't matter if the beam is a mono-energetic or a modulated one, sum all the contribute at the end of a run. So you must not create a different file name for each angle but you have only change the various angles of the modulator. At the end, in each voxel/slice, the total energy due to the different contributes (i.e. the modulated dose distribution) will be available. I can also suggest you, in a first trial, to use the ASCII file generation of the Bragg peak that you can check in a more immediate way.

Moreover, the modulator wheel is already designed to get a very particular modulation and the only thing you have to do is to change the angles. The way as it is constructed contains the *time dependency* you mentioned as the different sectors have a different angular aperture so that beam intercept them for different periods of time.

I hope my explanation can help you.

Regards, Pabo Cirrone

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1 Question: Re: How to get SOBP output with Hadrontherapy example   (Jongseok - 04 Apr, 2010)
(_ Feedback: Re: How to get SOBP output with Hadrontherapy example   (G.A.P.Cirrone - 04 Apr, 2010)
(_ Question: Re: How to get SOBP output with Hadrontherapy example   (Jongseok - 04 Apr, 2010)
(_ Feedback: Re: How to get SOBP output with Hadrontherapy example   (G.A.P.Cirrone - 04 Apr, 2010)
(_ Ok: Re: How to get SOBP output with Hadrontherapy example   (Jongseok - 05 Apr, 2010)
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