AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

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ptaylor
August 15, 2018 05:19PM
Hi, Sondos-

Output text files of properties are "*.grid" files; please search for "grid" in the 3dTrackID help file for more information, and also in this online documentation for more description:
[afni.nimh.nih.gov]

For more information on the tracking functions and how they work, please see this documentation:
[afni.nimh.nih.gov]
For probabilistic tracking "WM ROIs" or "WM connections (WMCs)" need not be contiguous.

What determines whether a voxel is "in" a WMC between a given pair of targets (say, A and B) is purely: is the number of tracts between A and B that run through the voxel greater than the threshold value? Each voxel is tested independently according to that criterion. It is possible that WM ROIs can be "patchy".

Note that I don't htink looking at the PAIRMAP is as informative as looking at the set of individual connections, as described here:
[afni.nimh.nih.gov]
since in the PAIRMAP file, there is less specificity, in general.

--pt
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FATCAT: Probabilistic tractography acting up? Attachments

sondosayyash August 15, 2018 04:53PM

Re: FATCAT: Probabilistic tractography acting up?

ptaylor August 15, 2018 05:19PM