AFNI Message Board

History of AFNI updates  

|
December 06, 2018 03:24PM
Would it be wrong to have 0 number of tracts running between 2 ROIs? The grid output will sometimes return a #NT of zero between two ROIs. That implies that there are no structural connections running between a set of ROIs. I know some ROIs are connected through indirect structural connections, but is that the case for ROIs that are not expanded far enough to touch the white matter?

I'm just worried about drawing wrong conclusions from my dataset.

Does that mean I need to increase the inflation value? Is it problematic and inaccurate to claim that there are no tracts running between two ROIs?
Should I just inflate my ROI's to maximum capacity to ensure that they touch the WM tracts?

I also wanted to add another question. I noticed that in the .grid file output from 3dTrackID there are listed average length in mm of a bundle of tracts. And if we are looking at ROI1 to ROI1 there could be 33mm length of tracts between the same ROI and itself. How does that work? Also, why do we get a value for the number of tracts from ROI1 to ROI1?

Thanks for the clarification in advance. I hope to hear back from you soon .



Edited 2 time(s). Last edit at 12/06/2018 04:18PM by sondosayyash.
Subject Author Posted

3dTrackID no tracts running between ROIs

sondosayyash December 06, 2018 03:24PM

Re: 3dTrackID no tracts running between ROIs

ptaylor December 06, 2018 06:40PM

Re: 3dTrackID no tracts running between ROIs

sondosayyash December 07, 2018 03:33PM

Re: 3dTrackID no tracts running between ROIs

ptaylor December 10, 2018 04:59PM



Sorry, only registered users may post in this forum.

Click here to login