[Insight-users] Regarding Resampling using image orientation patient and image position patient

[Luis Ibanez]

Hi Sachin,

The transformation that you are applying is only
valid if the two datasets were taken from the same
scanner.

Please post to the list the following information:

          1) origin of both images
          2) orientation of both images
          3) pixel spacing for both images
          4) number of pixels along each axis
             for both images


---

In collaboration with NAMIC (National Alliance
for Biomedical Computing) support is being added
to ITK in order to consider the orientation from
DICOM headers when performing registration. This
may still take a while for stabilizing,... so in
the meantime you may still need to do your manual
conversion.

Please post the information requested above.


   Thanks


     Luis



-----------------------
Sachin Jambawalikar wrote:

> Hi Luis and Jolinda,
> 
> I'm trying to resample  one volume series to another volume series based on the 
> transformation matrix formed by the direction cosines and the image
> position patient  for the  left most point of the first slice in each
> volume.
> 
> I find the inverse of 4x4 affine matrix(obtained by direction cosines
> + image postion patient) for the fixed volume and  premultiply it to
> the transformation of the moving volume. (both volumes are different
> series of the same dicom study).
> 
> In resample image filter I set the  tranform matrix as the 9
> (rotation+shear +scaling) components  of the affine transform matrix
> and the transform vector is set as the 3 translation coordinates  .
> 
> After resampling  all I get is a volume of zeros  with correct
> dimensions and spacing of the fixed volume.
> 
> Is there a way in itk to  resample  moving volume to  fixed volume
> based on the dicom  header information ??
> 
> Regards
> --Sachin
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