[Gate-users] Variance reduction, splitting primary particles in Gate V6.1

[Didier Benoit]

Hi Matthew,

By using the CT scan you could apply splitting with the command:
/gate/output/imageCT/vrtFactor 10
(http://wiki.opengatecollaboration.org/index.php/Users_Guide_V6.1:Defining_a_system#CTscanner)

Or you could use the russian roulette:
http://wiki.opengatecollaboration.org/index.php/Users_Guide_V6.1:Cut_and_Variance_Reduction_Technics

Kind regards,
Didier Benoit

On Jan 25, 2012, at 12:18 AM, Matthew Belley wrote:

> Dear All:
> 
> I am currently simulating a CT scan (similar to example_CT) on a voxelized phantom.  I would like to apply variance reduction techniques such as particle splitting to improve the statistics.
> 
> Is it possible to apply "splitting" to all primary particles (photons) that enter a specific volume or voxel?  I do not wish to apply splitting for a given physics process, since it will be the un-attenuated photons that primarily contribute to the signal in the detector.
> 
> Thank you in advance and best regards,
> Matt Belley
> 
> -- 
> Matthew Belley
> 
> Medical Physics Ph.D. Student
> Duke University
> 
> _______________________________________________
> Gate-users mailing list
> Gate-users at lists.opengatecollaboration.org
> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users

----------------------------------------------------------------
Didier BENOIT, GATE Engineer
Imagerie et Modélisation en Neurobiologie et Cancérologie (IMNC)
IMNC – UMR 8165 CNRS – Université Paris 7 – Université Paris 11
Campus d’Orsay
Bâtiment 440
91406 ORSAY Cedex

Tél : (33) 1 69 15 68 76
E-mail : benoit at imnc.in2p3.fr
http://www.imnc.in2p3.fr
----------------------------------------------------------------