Hi - both primary and secondary fibres are used during tracking. See (Behrens et al. Neuroimage 2007) for a detailed description of the algorithm.
Saad
On 30 Aug 2012, at 09:52, SUBSCRIBE FSL Jay wrote:
> Hello,
>
> I have been tracking fibers using PROBTRACKX and i see that a 3D image file is generated, containing the output connectivity distribution to the seed mask (fdt_paths.nii.gz) .
>
> i assume that these connectivity distributions represent the primary fiber orientation extracted from dyads1.nii.gz. Is there a possibility to get a similar 3D image file for secondary fibers with the information contained in dyads2.nii.gz ?
>
> BW
> Jay
>
--
Saad Jbabdi
University of Oxford, FMRIB Centre
JR Hospital, Headington, OX3 9DU, UK
(+44)1865-222466 (fax 717)
www.fmrib.ox.ac.uk/~saad
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