Hi there everyone.
I have found that a few of my subjects have a large discrepancy in the number of tracts which travel between cortical nodes.
I am performing iFOD2 ACT with 10 million streamlines generated which are filtered to 1 million.
After processing the tck2connectome assignment files I found that the discrepancy largely results from tracts with initiate and terminate within the same node. There are so many of these tracts that it drives the number of tracts between other regions down (image 2). These nodes were mostly in sub-cortical areas. This discrepency is present across the Desikan-killianyand and HCPMPP1 parcellation schemes.
Does anyone have any thoughts on why this is occurring?