[Insight-users] 3D image sub-volume and transform matrix

[Jeremy Lecoeur]

  So, if I got this right, my translation should be the difference (in 
mm) between the 1st voxel of each image and my rotation should be based 
on the three Euler angles.
When I do that, the orientation looks good but not the the translation. 
Is there a trick related to the fact that the two images have different 
resolutions.
Small volume is 0.0683 x 0.0683 x 0.5 mm and big volume is 0.5 x 0.5 x 
0.5 mm.

Jeremy

On 11/11/2011 02:39, Dženan Zukić wrote:
> Maybe this example will help:
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/VolumeRendering/itkVtkImageConvert
>
>
> On Thu, Nov 10, 2011 at 21:28, Jeremy Lecoeur 
> <jeremy.lecoeur at vanderbilt.edu <mailto:jeremy.lecoeur at vanderbilt.edu>> 
> wrote:
>
>
>
>     Hello,
>
>     I have two 3D images, one is a sub-volume of the other but is not
>     in the
>     same orientation.
>     For the big image, I know its size and also the coordinates in mm
>     of its
>     first voxel with respect to a frame of reference.
>     For the small image, I know its size, the coordinates in mm of its
>     first
>     voxel with respect to the same frame of reference and also the 3 euler
>     angles (phi, theta, psi) that defines its orientation.
>     With that, how can I compute the transformation matrix that will allow
>     me to see the small image in the big image, at the right place? I know
>     it's supposed to be fairly simple but I cannot figure it out.
>
>     Jeremy
>
>     -- 
>     Jeremy Lecoeur, Ph.D.
>
>
>
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-- 
Jeremy Lecoeur, Ph.D.
Research Associate
Vanderbilt University
Phone: +1 615 343 7798
Fax: +1 615 343 5459

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