Hi
I am not sure I fully understand this. What you are saying is that you
are running probtrackx with a waypoint mask, but this behaves as if it
were a termination mask. Does that mean that the tracts ending at your
mask DO stop, but there are many more that do not pass through it? In
that case I cannot think of a valid reason why this should happen,
except perhaps that if you are using FSL4.0.* and earlier, you might
need to have binary masks, as these will be rounded to zero if they
contain values smaller than 0.5.
Cheers,
Saad.
On 8 Nov 2008, at 20:36, Carlos Faraco wrote:
> I have been using the wayoption mask option to generate tracts from
> one mask
> to another, and so far have been successful in doing this. However
> there are
> two particular masks which are very close to each other whose
> fdt_paths
> results, when tracking to each other, appear as if I had picked the
> Termination mask option. In other words the resulting image shows
> tracts
> passing throughout the whole brain, which are very sporadic in this
> case,
> and additionally, there is no tract going from one point to the
> other. Is
> there a valid reason for why this is happening or is this just a bug?
>
> Any help would be appreciated.
>
Saad Jbabdi
Oxford University FMRIB Centre
JR Hospital, Headington, OX3 9DU, UK
+44 (0) 1865 222545 (fax 717)
www.fmrib.ox.ac.uk/~saad
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