[Gate-users] Variance Reduction in Gate

kirova at MSKCC.ORG kirova at MSKCC.ORG
Thu Feb 15 17:17:43 CET 2007

Hi Michail and Phani,
That is correct, there are no variance reduction techniques currently
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,


From: gate-users-bounces at lists.healthgrid.org
[mailto:gate-users-bounces at lists.healthgrid.org] On Behalf Of Phani
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


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.


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

	Greetings All,
	I just wanted to confirm that there is no variance reduction
	such as importance sampling implemented in Gate as of today. Is
	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

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