[Mrtrix-discussion] Human Connectome Project dataset issue

[Ivan Alvarez]

Hello Mrtrix users,

I tried analysing a sample subject from the recently available Human 
Connectome Project dataset (https://db.humanconnectome.org), and 
encountered an issue with CSD tractography in Mrtrix. In brief, the 
dataset has 1.25 mm isotropic voxels, 270 directions, 3 b-shells 
(1000,2000,300) and 2 repeats.

The tensor estimation worked fine, and am able to compute 
sensible-looking FA maps. The mask erosion is also fine, but when I view 
the response function coefficient, it displays an unusual shape (RCF 
<http://postimage.org/image/cl7tpwc3p/>). The csdeconv command returns 
no errors and the orientation plot looks reasonable. My problem is, when 
I attempt to perform tractography with the streamtrack command, the 
program hangs.

Any idea as to why this might be?

-- 
Kind regards,
Ivan Alvarez

PhD Candidate
Imaging and Biophysics Unit
UCL Institute of Child Health
30 Guilford Street, London, WC1N 1EH

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