Hi Anastasia

Thank you for your answer.

Yes, those files exist.
I also extracted the bvec an bval files with anotther software then dcm2nii and i keep getting the same kind of error.
Also, about the 6 diffusion direction, those data i sent you, are just testdata for running tracula.

sincerely
Florian

>>> Anastasia Yendiki <ayendiki@nmr.mgh.harvard.edu> 02.08.13 0.41 Uhr >>>

Hi Florian - Do these files exist?
/data/physics/florian/nii/1020000485074_20080319/dmri/dwi_orig.mghdti.bvecs
/data/physics/florian/nii/1020000485074_20080319/dmri/dwi_orig.mghdti.bvals

The format of the bvecs and bvals that you sent seems fine, but (and this
has nothing to do with the error you're getting) I have to warn you that
you may not be able to get good results running probabilistic tractography
on this data. It looks like you're acquiring the same 6 diffusion
directions, repeated 8 times. Six directions is the absolute minimum for
reconstructing the tensor model, but will probably not be sufficient for
the crossing fiber model that bedpostx reconstructs (and is used by
tracula). Your scan time is better spent acquiring 48 different
directions, rather than the same 6 directions 8 times.

a.y

On Mon, 29 Jul 2013, Borsodi Florian wrote:

> Hello,
>
> I have been trying to run tracula on my data and i keep getting the same
> kind of error repeatedly.
> For my imput I am using dicoms from a Siemens scanner with a stadard
> diffusion protocol. However, tracula cannot read the bvec and bval data out
> of the dicom header. Therefore, I implemented bvec and bval files into the
> config file.
> After doing so, I got the error which says that tracula cannot find the
> "dwi_orig_flip.mghdti.bvecs" and "dwi_orig_flip.mghdti.bvals" files.
> I have tried many options, but still cannot find a solution.
> I am hoping to get some troubleshooting help.
>
> I have atteched my log- and config- files, as well as my bvec and bval
> files.
> To uphold patient confidentiality, I have encode the name patient's data as
> "AAAAAA".
>
> I believe the problems are the bvec and bval files or their structures. The
> log-file lete me assume this, especially the lines 202 - 205, 264 - 268 and
> 1480 - 1484.
>
> Thank you in advance for your help, and your speedy response.
>
> With kind regards,
>
> Florian Borsodi
> Department of Neurology
> Medical University of Graz
>
>


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