[Camino-users] DTeig Extraction

[Philip A Cook]

Yes, you can use fslmerge to combine the vector components.

When translating image formats / moving between software, there's potential problems with differences in image orientation conventions. So be careful that your scalar images are not flipped left / right and that the vectors are correctly oriented. The most common problem is a difference in principal axes, eg (x,y,z) in one software is (x,y,-z) in the other. If this is the case, you can use fslmaths to fix the component images before merging.

> On Jun 27, 2017, at 12:36 PM, Ana Fouto <a.fouto at CAMPUS.FCT.UNL.PT> wrote:
> 
> Thanks! 
> 
> I used the following code:
> 
> cat restore_fit.bdouble | dteig | voxel2image -components 12 -outputroot dteig -header original_data.nii.gz
> 
> I guess it worked because I got 12 outputs. But I have another question, the eigenvectors came in components is it possible to join them in only one vector? So I can also overlay with the ones I got from FSL dtifit.
> 
> Best regards,
> Ana Fouto
> 
> 2017-06-27 16:55 GMT+01:00 Philip A Cook <cookpa at mail.med.upenn.edu>:
> You can use voxel2image to convert the dteig output to NIFTI images. The principal eigenvalue will be the first component of the output.
> 
> http://camino.cs.ucl.ac.uk/index.php?n=Main.Fileformats#toc10
> 
> > On Jun 27, 2017, at 7:00 AM, Ana Fouto <a.fouto at CAMPUS.FCT.UNL.PT> wrote:
> >
> > Dear all,
> >
> > I'm testing the tensor fitting with RESTORE method and I would to know if is there way to extract the principal eigenvalue so I could compare this fitting method with the traditional fitting performed by FSL dtifit. The purpose of doing this is because I want to load both in fslview and see the difference by visual inspection.
> >
> > Thanks in advance for the help.
> >
> > Best regards,
> > Ana Fouto
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>