<div dir="ltr"><div><div>Hi Rachel,<br><br></div>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 <a href="http://www.sciencedirect.com.ezp.lib.unimelb.edu.au/science/article/pii/S1053811910003228">this one</a> has interesting results on the effects of other parameters; anyone with a good alternative reference feel free to chime in.<br>
If I recall correctly, 10mm is shorter than the default implemented in other software packages.<br></div>I discuss minimum track length fairly briefly in the <a href="http://www.sciencedirect.com/science/article/pii/S1053811912005824">ACT paper</a>; 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...<br>
<div><br></div><div>Rob<br></div></div><div class="gmail_extra"><br clear="all"><div><div dir="ltr"><br>--<br><br><span style="color:rgb(255,102,0)"><b>Robert Smith, Ph.D</b><br>Research Officer, Imaging Division</span><br>
<br>The Florey Institute of Neuroscience and Mental Health<br>Melbourne Brain Centre - Austin Campus<br>245 Burgundy Street<br>Heidelberg Vic 3084<br>Ph: +61 3 9035 7128<br>Fax: +61 3 9035 7301<br><a href="http://www.florey.edu.au/" target="_blank">www.florey.edu.au</a><br>
</div></div>
<br><br><div class="gmail_quote">On Wed, Jul 30, 2014 at 3:46 PM, Rachel Ellis <span dir="ltr"><<a href="mailto:r.ellis@student.unimelb.edu.au" target="_blank">r.ellis@student.unimelb.edu.au</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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?<br>
<br>
Many thanks<br>
Rachel<br>
<br>
<br>
_______________________________________________<br>
Mrtrix-discussion mailing list<br>
<a href="mailto:Mrtrix-discussion@www.nitrc.org">Mrtrix-discussion@www.nitrc.org</a><br>
<a href="http://www.nitrc.org/mailman/listinfo/mrtrix-discussion" target="_blank">http://www.nitrc.org/mailman/listinfo/mrtrix-discussion</a><br>
</blockquote></div><br></div>