[Mrtrix-discussion] question regarding some tracking parameters

[Peter Neher]

Hi all,

I have some questions regarding the parameters of streamtrack:

 1. Should it basically be the same to use a 0.2 thresholded FA image as
    -mask input as to apply a -cutoff 0.2? Because it is not. There seem
    to be fibers present in low FA regions if  I use the -cutoff
    parameter. It does change something, but I am not sure what exactly :)
 2. How is the -num parameter applied internally? Don't you just seed in
    every voxel of the mask image?
 3. If I use the probabilistic version, how many times is the trajectory
    originating from one seed point sampled and how is the result
    combined into one final fiber?

Thanks in advance!

Peter

-- 
Dipl.-Inform. Peter Neher
German Cancer Research Centre
(DKFZ, Deutsches Krebsforschungszentrum in der Helmholtz-Gemeinschaft, Stiftung des öffentlichen Rechts)
Division of Medical and Biological Informatics
Im Neuenheimer Feld 280, D-69120 Heidelberg

Phone: 49-(0)6221-42-3552, Fax: 49-(0)6221-42-2345
E-Mail: p.neher at dkfz-heidelberg.de, Web: www.dkfz.de

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