[Insight-users] problems on deformable registration 8

[Sean Lee]

Hi, Luis,
Thank you very much for your suggestions and I will check all those factors. I will get back to you later.
Would you mind explain the difference between two optimizers: itkRegularStepGradientDescentOptimizeritkLBFGSBOptimizer

Thanks.
Sean

> Date: Fri, 10 Jul 2009 10:34:28 -0400
> From: luis.ibanez at kitware.com
> To: kevinseanlee at live.com
> CC: insight-users at itk.org
> Subject: Re: [Insight-users] problems on deformable registration 8
> 
> 
> 
> Hi Sean,
> 
> 
> I'm wondering if this could be an aliasing effect
> between the BSpline grid and the grid of your image.
> 
> 
> But other suspects are:
> 
> 
>     1) and Interpolator issue in the border
> 
>     2) an issue with the Optimizer
> 
> 
> 
> Please do the following:
> 
> 
>     Pass your images as input to
> 
>       DeformableRegistration15.cxx
> 
> 
>     This program uses a different Optimizer.
> 
> 
>     That may help to eliminate (2) above.
> 
> 
> If things still fail....
> 
> 
> Then we will ask you to send your images to us.
> So we can try to replicate the problem here.
> 
> 
> 
>     Thanks
> 
> 
>        Luis
> 
> 
> 
> --------------------
> Sean Lee wrote:
> > Hi, Luis,
> > 
> > I found that another parameter could affect the result. If I 
> > change gridSizeOnImage.Fill( 8 ) to 
> > gridSizeOnImage.Fill( 10 ), it could result in the case with 59 slices 
> > that used to run 34 iterations 
> > only run one iteration.
> > 
> > So it is really depending on the parameters you input.
> > 
> > Thanks.
> > 
> > Sean
> > 
> > ------------------------------------------------------------------------
> > From: kevinseanlee at live.com
> > To: luis.ibanez at kitware.com
> > Date: Thu, 9 Jul 2009 12:53:39 -0500
> > CC: insight-users at itk.org
> > Subject: Re: [Insight-users] problems on deformable registration 8
> > 
> > Hi, Luis,
> > 
> > I am trying to provide more information and tested it with several other 
> > numbers. Here is the results.
> > 
> > 29, 56, 57, 58, 60 slices: 1 iteration with a bad result.
> > 
> > 30 slices; 45 iterations with a good result. (of course, only half 
> > volume is matched)
> > 59 slices; 34 iterations with a good result.
> > 
> > Let me know what I can do for this issue.
> > 
> > Thanks.
> > 
> > Sean
> > 

_________________________________________________________________
Windows Live™ SkyDrive™: Get 25 GB of free online storage.
http://windowslive.com/online/skydrive?ocid=TXT_TAGLM_WL_SD_25GB_062009
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.itk.org/pipermail/insight-users/attachments/20090710/dec5284b/attachment.htm>