[Mristudio-users] Number of fibers

[susumu mori]

Hi Vankat,

This is one of the questions asked several times in the past. If you search
the Mailing List archive (
http://lists.mristudio.org/pipermail/mristudio-users/) with "number of
fibers" (using ctrl-f), you can find some past communications. My typical
reply is;

The number of the fiber itself doesn't carry anatomical meaning. In
DtiStudio, we use the exhaustive approach, meaning fiber tracking is
initiated from the center of all pixels above the threshold. If the number
of the seed points is increased, the number of the fibers increases too. So,
it is parameter-dependent. You may be able to compare the numbers between
subjects but it may simply reflect the size of the tracts, which can be also
obtained from the number of pixels. The number of pixels is also reported in
DtiStudio and has a physical dimension, which may be easier to use.

As you can imagine, it is not possible to link "the number of fibers" to the
real axonal fibers.
My lab doesn't use this metric.

Susumu


On Mon, Sep 12, 2011 at 1:34 PM, Rajagopalan, Venkateswaran <
rajagov2 at ccf.org> wrote:

>  Dear All,
>
> After fiber tracking when I try to see statistics of FA along the fiber I
> could see in the stats file number of fibers in each slice. I am wondering
> what this number of fibers mean physiologically and how is this number of
> fibers calculated is it the number of the streamlines in a voxels.
>
> Thanks in advance
> Venkat
>
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