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Idea Re: problem with scoring volume can't get apsorbed dose 

Forum: Biasing and Scoring
Re: Question problem with scoring volume can't get apsorbed dose (Toth Arpad)
Date: Jan 24, 23:22
From: Michael H. Kelsey <Michael H. Kelsey>

On Thu, 24 Jan 2019 19:56:01 GMT, Toth Arpad wrote:
>  I want to simulate a CBCT dose in Cirs IMRT thorax phantom. So I made the body
>  of phantom, than subtracted wholes in phantom to put the organs inside (lungs,
>  spine...). Since I have to rotate the phantom i made the organs as daughters of
>  phantom. The problem is that when I set lungs as scoring volume I', getting the
>  dose, but when I select the spine or the isocenter I'm getting 0 Gy. 

You don't need to, and must not, subtract holes before placing daughters. Just keep your mother "body" volume whole, and place the organ daughters in it. Geant4 does not like it when a daughter volume is placed "outside" the space occupied by its putative mother volume.

  -- Michael Kelsey

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Feedback Re: problem with scoring volume can't get apsorbed dose  by Toth Arpad <Toth Arpad>,   Jan 25, 11:34
Re: Idea Re: problem with scoring volume can't get apsorbed dose (Michael H. Kelsey)
On Fri, 25 Jan 2019 07:22:31 GMT, Michael H. Kelsey wrote:
> On Thu, 24 Jan 2019 19:56:01 GMT, Toth Arpad wrote:
> 
> >  I want to simulate a CBCT dose in Cirs IMRT thorax phantom. So I made the body
> >  of phantom, than subtracted wholes in phantom to put the organs inside (lungs,
> >  spine...). Since I have to rotate the phantom i made the organs as daughters of
> >  phantom. The problem is that when I set lungs as scoring volume I', getting the
> >  dose, but when I select the spine or the isocenter I'm getting 0 Gy. 
> 
> You don't need to, and must not, subtract holes before placing
> daughters. Just keep your mother "body" volume whole, and place the
> organ daughters in it. Geant4 does not like it when a daughter volume is
> placed "outside" the space occupied by its putative mother volume.
> 
>   -- Michael Kelsey
> 
>Thank You very much!
>It works  now :)
>
>Toth Arpad
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