[Insight-users] VersorRigid3DTransform using ImageRegistration8.cxx

[Jayme Kosior]

Originally I was using ITK v.1.4.  After upgrading to 1.6, the issue 
seems to be resolved.  ImageRegistration8.cxx in version 1.6 is now 
using itkVersorRigid3DTransformOptimizer instead of 
itkRegularStepGradientDescentOptimizer.  The following message dialogs 
explain why a special optimizer is needed for the Versor registration.

http://www.itk.org/pipermail/insight-users/2004-January/006089.html

Jayme

On Mar 24, 2004, at 21:08, Jayme Kosior wrote:

> Hello.
>
> I have been attempting to register 3D data sets using the 
> ImageRegistration8.cxx example available in the Examples directory.  I 
> have been using a 3D stack of MR Flair images in Analyze format as the 
> fixed image.  For the moving image, I am rotating the fixed image by 
> 15 degrees clockwise.  The images are both in 32-bit format, and the 
> spacing is provided via the Analyze header (0.94, 0.94, 7.0).
>
> After running ImageRegistration8 on these two images, the output image 
> stack seems to be correctly registered  rotationally.  However, the 
> images are shifted to the upper right corner such that half of the 
> image is cropped.
>
> I have read all of the posts that I could find pertaining to the 
> VersorRigid3DTransform and have read the itk manual.  I have a 
> suspicion that my problem is either with spacing (which should be 
> correct from the analyze header) or the CenteredTransform.  However, I 
> am at a loss as to why this is happening.
>
> Thank you for your time.
>
> Jayme
>
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