Hi Andi - I managed to track this down by looking at the complete data set that you sent me. Your bvals file has no b=0, there's only b=2075 with some b=5 interspersed. The b=5 volumes must be your baseline volumes but unfortunately there's no way for the program to know this right now.
As a hack for now I'd just set the 5's to 0's in dmri/bvals and rerun the path reconstruction step, it should be a fine approximation for that step. I'll add support to this for the next version.
Sorry about that! a.y
On Tue, 30 Oct 2012, Andi Heckel wrote:
Dear Tracula team,
I have noticed in a multisubject tracula analysis, that the posterior density in many if not all paths in the path.pd.nii.gz file is just a bright one-dimensional curve, rather than a true distribution. The path.map.nii.gz is empty. This is true for both flirt and bbreg registered versions in many subjects. Trac-all finished wiithout errors. So did Recon-all.
Could it actually be a memory (RAM) problem ? We are running tracula on a cluster with only 2.5 GB per core.
thx for any help and kind regards, andi