Hi Chris - That's probably the corpus callosum forceps major or minor. It's the highest-curvature path and that makes it harder to initialize the tractography. If it looks right visually, and it took 90 tries to do that, then it's doing its job as it's supposed to :)

a.y

On Mon, 13 Aug 2012, Chris Watson wrote:

Hello, When I go through trac-prep, pathway #7 always takes much much longer than any of the others. And for that pathway it always displays this: INFO: Distances between consecutive points are 34 37 34 40 WARN: Could not find satisfactory control point fit - try 90

Has anyone else had this problem? Visually, they look right to me.

Thanks, Chris