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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eji
July 19, 2021 07:40AM
Dear experts,

I have a couple questions about the NT parameter from the 3dTrackID *.grid output file.

- I believe streamline count is another term used synonymously with number of tracts (NT), correct?
- Given one subject, if NT = 0 for a region, should all other indices (i.e. FA, MD, RD, etc) also be 0?
- Am I correct that NT and PV should be strongly correlated?
- Related to the above question, would individual tracts vary in terms of thickness? For example, if NT = 4000 in a region, are all 4000 tracts the same size?
- Should we expect any sort of relationship (e.g. positive correlation) between NT and FA within a region?

Thank you for your help!



Edited 1 time(s). Last edit at 07/19/2021 07:41AM by eji.
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Subject Author Posted

Understanding NT parameter (from 3dTrackID *.grid output file)

eji July 19, 2021 07:40AM

Re: Understanding NT parameter (from 3dTrackID *.grid output file)

ptaylor July 26, 2021 04:51PM

Re: Understanding NT parameter (from 3dTrackID *.grid output file)

eji August 04, 2021 05:05AM