Hi Vincent - Thanks for bringing this to my attention. I can see what might cause this glitch (only in the longitudinal case) and I'll fix it in the next version.

In the meantime, if you delete one of the two identical lines from cpts.map.txt, and then rerun the dmri_pathstats command line that you'll find in the trac-all.log of your subject, it should regenerate the stats files correctly. Sorry for the inconvenience.

a.y

On Fri, 17 May 2013, vbrunsch@nmr.mgh.harvard.edu wrote:

Dear Anastasia,

When running the longitudinal tracula version on our 39 subjects I found for some of them "nan"-values for the center_avg variables of some tracts. When I have a look at the tract distribution and the highest probability path, everything seems to be ok. However, when checking the control points of this path, two of them are the same. Do you know how this could have happened / what to do?

E.g. control points of forceps major from a subject (cpts.map.txt), see 4th and 5th control point:

63 20 39 67 31 39 59 43 38 52 42 38 52 42 38 43 32 38 50 19 33

And the respective pathstats.overall.txt: Count 1500 Volume 370 Len_Min 62 Len_Max 99 Len_Avg 78.9307 Len_Center 0 AD_Avg 0.00155598 AD_Avg_Weight 0.00158424 AD_Avg_Center -nan RD_Avg 0.000438439 RD_Avg_Weight 0.000401328 RD_Avg_Center -nan MD_Avg 0.000810952 MD_Avg_Weight 0.000795633 MD_Avg_Center -nan FA_Avg 0.662419 FA_Avg_Weight 0.696257 FA_Avg_Center -nan

Thanks for your help!! :) Best, Vincent

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