Hi Romain
There has been a lot of discussion on this topic here.
Bottom line: there isn't a thresholding strategy in the classical (statistical) sense.
You can, however, do one of the following:
1. use ROIs (exclusion, inclusion, stop) to dissect the relevant part of your tract
2. set a threshold (based on %waytotal) so that the result is anatomically plausible (use the same across subjects)
Saad.
On 6 Jul 2011, at 10:19, romain quentin wrote:
> Dear all,
>
> I used probtrack to track fronto-tectal fibers. I have an ROI at FEF radius 1 cm and one drawn at the colliculus. I run 5000 Streamline. I wonder if based on its characteristics, there is a particular threshold trajectories for voxels (10, 20, 50?) or on the waytotal in a subject to determine if the pathway is recovering well or not?
> Many thanks,
>
> Romain
>
--
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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