Dear all, Do you have suggestions/ideas for me please? Thank you, Barbara
-------- Original Message -------- Subject: TRACULA preprocessing: bvector rotation, negative eigenvalues Date: Tue, 07 Oct 2014 19:09:00 +0100 From: Barbara Kreilkamp <bakk....@gmail.com> To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu> Dear Freesurfers, I am looking for information on how exactly the b-table gets rotated. 1. It seems that eddy_correct runs once with 12 doF, and then the bmatrix gets updated based on this registration. Would you please confirm? 2. I know that my data has negative eigenvalues (most of them seem to appear in the 'halo' around the images), and I would like to save L2, L3 voxel values within tracts in the pathstats.byvoxel.txt file. How may I edit dmri_pathstats to accommodate this? My aim is to identify MD, RD, FA, AD (L1) voxel values that were biased by a lot of noise. Thank you very much, Best, Barbara
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