[Camino-users] Eigensystem issue monotensor fitting

Alessandro Calamuneri alecalamuneri at gmail.com
Thu Oct 15 02:06:19 PDT 2015


Hi Philip,
thanks for quick answering,

yes I followed that convention.

It is rather complicated visualizing the issue in any way, because, for
instance, pdview looks good.
However, i made a test right now with a DTI dataset of mine. 32 directions
and a b0 image.
This are commands I used

modelfit -inputfile dwi.Bfloat -model nldt_pos .schemefile scheme.scheme
-bgmask Mask.Bshort > DTI.Bdouble
cat DTI.Bdouble | fa | voxel2image -outputroot FA -header DTI.nii
cat DTI.Bdouble | dteig > EIG.Bdouble
voxel2image -inputfile EIG.Bdouble -components 12 .outputroot eigs_ -header
DTI.nii

then, I used spm tool to import nifti images in matlab, and counted how
many rotation matrices had determinant equal 1 or -1 (within the
foreground); I found 55.21% of voxel having proper rotation while 44.79%
having determinant equal -1.

If you like I can send you eigensystem, exitcode volume, mask and code I
used on matlab so that you might check if I did something wrong.

Attached a representative axial view of my dataset, showing that fitting
was fine..


Alessandro
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