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

Didier Benoit benoit at imnc.in2p3.fr
Wed Jan 25 00:34:25 CET 2012

Hi Matthew,

By using the CT scan you could apply splitting with the command:
/gate/output/imageCT/vrtFactor 10

Or you could use the russian roulette:

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
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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

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