Hi - this is because NIFTI (at the moment in FSL) has a limit on the size along each dimension (circa 32k).
If you use the latest FSL (5.0.2) this should produce an ascii file for the tract_space_coord file, so this has no size limit.
Cheers
Saad
On 6 Jan 2013, at 18:50, Hiroki Kurashige wrote:
> Dear FSLers,
>
> I executed the probtrackx2 with --omatrix2 option and
> got the file, tract_space_coords_for_fdt_matrix2.nii.gz.
> In my understanding, this file is the list of x-y-z vectors for all target voxels.
> Because I used the target ROI including 182024 voxels,
> this file should include 182024 vectors.
> Actually, however, the file included just one x-y-z vector.
>
> The other output files have no problem.
> The number of columns in fdt_matrix2.dot is 182024 and the max intensity of lookup_tractspace_fdt_matrix2.nii.gz is also 182024.
>
> Thanks,
>
> Hiroki
>
--
Saad Jbabdi
University of Oxford, FMRIB Centre
JR Hospital, Headington, OX3 9DU, UK
(+44)1865-222466 (fax 717)
www.fmrib.ox.ac.uk/~saad
|