[Gate-users] how to set MU prescription dose lines

[David Sarrut]

Hello,

there is no direct relationship between MU and number of primaries. You
need to somehow calibrate your system such as a given number of particles
gives you a given dose (ie 1 Gy at 10 cm in  water), and make the link with
the MU.

Yes the weight (1/N) of the particle is taken into account in the
doseactor. This is a weight associated with a particle (the E is not
divided, only the deposited E).

Sincerely,
David


On Thu, May 2, 2013 at 4:11 PM, 刘斌信件 <golder_time at 163.com> wrote:

> hi,
>   I  do not know the relation between "setTotalNumberOfPrimaries" of
> simulation  and  MU prescription dose in the external radiotherapy . How
> should  I set the number of the photon or events in simulation that the
> absorbed depth dose in phantom will arrive at a expected value. In addition
> , in Selective bremsstrahlung splitting (SBS) technology, the final state
> of the process is generated N times and the weight of each secondary is
> 1/N. Does it divide the energy of photon ( original produced by the
> bremsstrahlung)  into N pieces of energy ,and then get  single photon with
> original  energy of 1/N in  the same direction ?
>  Thank you for attention?
> yours sincerely,
> Bin
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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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