[Gate-users] Variance Reduction in Gate

[kirova at MSKCC.ORG]

Hi Michail and Phani,
 
That is correct, there are no variance reduction techniques currently
implemented.
VR for SPECT were developed and are currently being implemented in GATE
by the Ghent group.
VR for PET are under development.  The calculations in the phantom and
the scanner are separated by the Brest group. The strategies will be
discussed at the next OpenGATE meeting.
 
Best Regards,
Assen

________________________________

From: gate-users-bounces at lists.healthgrid.org
[mailto:gate-users-bounces at lists.healthgrid.org] On Behalf Of Phani
MANCHIRAJU
Sent: Thursday, February 15, 2007 10:53 AM
To: Mikhail Shilov
Cc: gate-users at lists.healthgrid.org
Subject: Re: [Gate-users] Variance Reduction in Gate


Hi,

You could use different random number seeds for the simulations, this
should help in variance reduction. From what I know, there is no other
way in which variance reduction could be achieved. No idea about how
importance sampling could be done in Gate.

Phani


On 2/15/07, Mikhail Shilov <mshilov1 at jhmi.edu> wrote: 

	Greetings All,
	
	I just wanted to confirm that there is no variance reduction
techniques
	such as importance sampling implemented in Gate as of today. Is
that
	right?
	Thanks
	
	
	
	Mikhail A. Shilov
	The Johns Hopkins University
	Department of Radiology
	Division of Medical Imaging Physics
	Tel:  443-287-7315
	Fax:  410-614-1977
	mailto: mshilov1 at jhmi.edu
	_______________________________________________ 
	Gate-users mailing list
	Gate-users at lists.healthgrid.org
	http://lists.healthgrid.org/mailman/listinfo/gate-users 
	



 
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