[Mrtrix-discussion] minlength default

[Robert Smith]

Hi Rachel,

As with a number of other free parameters, it's pretty heuristic. It's kind
of based on the logic that in the absence of any other information, you
want to see data from at least a few voxels with coherent fibre
orientations before you begin to trust that there might be a pathway there.
I'm not familiar with any published articles on the effect of selecting
minimum length, though this one
<http://www.sciencedirect.com.ezp.lib.unimelb.edu.au/science/article/pii/S1053811910003228>
has interesting results on the effects of other parameters; anyone with a
good alternative reference feel free to chime in.
If I recall correctly, 10mm is shorter than the default implemented in
other software packages.
I discuss minimum track length fairly briefly in the ACT paper
<http://www.sciencedirect.com/science/article/pii/S1053811912005824>; but
if reviewer #2 ever gets around to looking at my current submission, soon
I'll be able to show some data suggesting that very short connections in
the white matter are extremely prevalent...

Rob


--

*Robert Smith, Ph.D*
Research Officer, Imaging Division

The Florey Institute of Neuroscience and Mental Health
Melbourne Brain Centre - Austin Campus
245 Burgundy Street
Heidelberg Vic 3084
Ph: +61 3 9035 7128
Fax: +61 3 9035 7301
www.florey.edu.au


On Wed, Jul 30, 2014 at 3:46 PM, Rachel Ellis <
r.ellis at student.unimelb.edu.au> wrote:

> Hi, I have a question about minimum track lengths in MRtrix. Is there a
> theoretical justification for the default setting of 10mm for minimum track
> lengths? Are there any papers that discuss track lengths?
>
> Many thanks
> Rachel
>
>
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