[vtkusers] Reslice+Users Transform

[David Gobbi]

Hi Simone,

Your assessment is correct, the qform and sform are used to put the
volumes into the "anatomical coordinate space", as defined by the
nifti standard.

So the transform that you want to apply to the images, does it go from
the anatomical coordinate space of the MRI to the anatomical
coordinate space of the ultrasound?  As I said in my previous email,
vtkImageReslice goes from the data coordinate space of its output to
the data coordinate space of its input.  So if your transform uses
anatomical coordinates, then you have to convert it to data
coordinates before you use it with vtkImageReslice.  If your transform
already uses data coordinates, then you can ignore the qform and sform
and use your transform with vtkImageReslice directly (but you have to
make sure it is going in the correct direction, of course).

   David

On Fri, Mar 28, 2014 at 8:10 AM, strioso <tonti.simone at gmail.com> wrote:
> Hi David,
>
> thanks for your help! I don't use qform and sform matrix because I don't
> understand how to use them. I catch qform and qform matrix with
> GetS(/Q)FormMatrix() from my NIFTI volume but then how can I use these
> matrix? From documentation I understand that sform and qform are a sort of
> space transformation matrix which put the volume in the correct coordinates
> space. How can I do this in VTK?
> Thanks.
>
> Simone
>
>
>
> --
> View this message in context: http://vtk.1045678.n5.nabble.com/Reslice-Users-Transform-tp5726554p5726564.html
> Sent from the VTK - Users mailing list archive at Nabble.com.
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
>
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers