[Insight-users] registration consistency

[Blezek, Daniel J (GE, Research)]

Hi Qing,

  To ensure deterministic behavior of the regstration framework, you
will need to seed the Mersene Twister Random number generator with the
same seed.  Otherwise it will use the current wall time.  We've gone
through great trouble to ensure that the same seed will give the same
sequence in all platforms, so you registration results will be
deterministic up to the numerical differences between platforms.

-dan 

-----Original Message-----
From: insight-users-bounces+blezek=crd.ge.com at itk.org
[mailto:insight-users-bounces+blezek=crd.ge.com at itk.org] On Behalf Of
qing xu
Sent: Friday, July 20, 2007 10:33 AM
To: insight-users at itk.org
Subject: [Insight-users] registration consistency

Hi,

Does the same registration code with the same input always give the same
output?

I am doing a 3D registration for a dataset consisting of 50 volumes. I
put the registration code in a loop so that the registration can be done
one by one for each volume. However, the reults are much different from
what I got by processing one volume once a time. The only reason I can
think of is that running reigstration for too long would consume too
much memory, so the registration performance is affected. Is that
possible?  Does anybody have the same experience? Thanks in advance.


(my metric is mattes mutual information and transform is
VersorRigid3DTransform)


Qing

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