[Insight-users] DeformableRegistration7.cxx gives worse results

[Emma Ryan]

Just wanted to correct myself from yesterday's reply....

 I use the versorRigid3DTransformOptimizer not the gradient descent.

Thank you,
Emma

----- Original Message ----
From: Luis Ibanez <luis.ibanez at kitware.com>
To: Emma Ryan <eryanvtk at yahoo.com>
Cc: insight-users at itk.org
Sent: Thursday, July 26, 2007 5:51:33 PM
Subject: Re: [Insight-users] DeformableRegistration7.cxx gives worse results

Hi Emma,

It shouldn't happen...


           A bit more of information will be helpful...


For example:

1) Are the two synthetic images representing the same
    Modality ?

    The Image metric in DdeformableRegistration7.cxx
    is MeanSquares, so it is expected that both images
    should represent the same modality with a similar
    distribution of intensity values.

2) What combination of registration components did
    you used for the Rigid registration ?

      - What Metric ?
      - What Transform ?
      - What Interpolator ?
      - What Optimizer ?

3) Are you feeding DdeformableRegistration7 with the
    resampled image resulting from a Rigid registration
    process ? or did you set up the Bulk transform of
    the BSpline deformable transform ?

4) How many iterations of the Deformable registration
    did you manage to run before it stopped. ?


BTW, the size limit of emails to the list is 40Kb,
      If you want to show images you could upload
      them to a public web site and send the link
      to the list.



Please let us know about the questions above.


   Thanks



     Luis


------------------
Emma Ryan wrote:
> Hi,
> 
>      I am trying to register some synthetic data using 
> deformableRegistration7.cxx from the ITK Examples. The synthetic data is 
> almost well registered using rigid registration. So deformable 
> registration is used to fix the slight mismatch.  Unfortunately, the 
> checkerboard output for the 'after' images are worse that 'before'.
> 
> Why does this happen ?
> 
> Any clues ?  I haven't changed anything in the code except the Pixeltype
> 
> Emma
> 
> p.s. I tried to attach some images but it bounced back.
> 
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