Hi Peter - Each of the volumes in your DWI series was acquired with a certain b-value and a certain diffusion gradient direction. These have to be in the bvals and bvecs files, respectively, in the same order. This means for every volume in the DWI series, there'll be 1 number in bvals and 3 numbers in bvecs (could be zero in a few cases).
If you suspect that the bvals and bvecs files are not correct, you should consult your MR physicist. If you think they're correct but trac-all isn't reading them properly, you can attach those 2 files and I can take a look.
a.y On Fri, 18 Nov 2011, Peter J. Molfese wrote:
Hello, I'm running trac-all (trac-preproc) on some DTI data and receive the following error: dtifit -k /Users/pete/Documents/dti/pete/run7/peter/dmri/dwi.nii.gz -m /Users/pete/Documents/dti/pete/run7/peter/dlabel/diff/aparc+aseg_mask.bbr.nii.gz -r /Users/pete/Documents/dti/pete/run7/peter/dmri/bvecs -b /Users/pete/Documents/dti/pete/run7/peter/dmri/bvals -o /Users/pete/Documents/dti/pete/run7/peter/dmri/dtifit Error: bvecs and bvals don't have the same number of entries I found the following thread http://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg19747.html but when I attempted to add "export LC_ALL=en_US", the problem persists. I have looked in the files and found that they do indeed have different numbers of entries. The scans were performed on a Siemens TimTrio 3T scanner. Is there something else I should set? Peter J. Molfese, Ph.D. Postdoctoral Associate Haskins Laboratories 300 George Street, Suite 900 New Haven, CT 06511 peter.molf...@yale.edu CONFIDENTIALITY NOTICE: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intende d recipient, please contact the sender immediately by reply e-mail and destroy all copies of the original message.
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