Hi Allison - The mri_convert command at the top of your log file is trying to convert the directory /Users/Desktop/Tracula/diffusion_DTI to a nifti file. From the name of that nifti file, it looks like it's expecting to find a field map and not finding it.

Hope this helps, a.y

On Tue, 8 Jan 2013, Allison Gruber wrote:

Dear Freesurfer experts,

I have encountered the following error while running the tracula pre-processing command and was hoping you could help me understand how to correct this.

Selection from log:

mri_convert /Users/Desktop/Tracula/diffusion_DTI/ /Users/Desktop/Tracula/diffusion_DTI/SubjectX/dmri/b0mag.nii.gz mri_convert /Users/Desktop/Tracula/diffusion_DTI/ /Users/Desktop/Tracula/diffusion_DTI/SubjectX/dmri/b0mag.nii.gz corRead(): can't open file /Users/Desktop/Tracula/diffusion_DTI/COR-.info $Id: mri_convert.c,v 1.179.2.2 2011/05/16 20:53:47 greve Exp $ reading from /Users/Desktop/Tracula/diffusion_DTI/... Darwin MacBook-Pro.local 11.4.0 Darwin Kernel Version 11.4.0: Mon Apr 9 19:32:15 PDT 2012; root:xnu-1699.26.8~1/RELEASE_X86_64 x86_64

trac-preproc exited with ERRORS at Tue Jan 8 14:34:39 EST 2013

Please let me know if this is not enough information. Thank you for your help.

Allison _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer