Hi Jon - I mean concatenating them:

mri_concat --i dwi1.nii.gz dwi2.nii.gz --o dwi.nii.gz cat bvecs1.txt bvecs2.txt > bvecs.txt cat bvals1.txt bvals2.txt > bvals.txt

Make sure though this doesn't leave any blank lines in between the two sets of bvecs/bvals in the concatenated text files.

Hope this helps, a.y

On Tue, 5 Mar 2013, Jon Wieser wrote:

HI Anastasia, The two data sets have the same bvecs table, but the bvals differ, one set is 800 and the other is 1000. can you be more specific as to how I would merge the two datasets? or you talking about putting all the dicom files from both sets into one directory, or do you mean something else? we have one anatomical set

Jon

----- Original Message ----- From: "Anastasia Yendiki" ayendiki@nmr.mgh.harvard.edu To: "Jon Wieser" wieser@uwm.edu Cc: "freesurfer" freesurfer@nmr.mgh.harvard.edu Sent: Monday, March 4, 2013 5:17:31 PM Subject: Re: [Freesurfer] processing 2 dti's from 1 experiment

Hi Jon - You can try merging the DWIs, gradient tables, and b-value files from the 2 scans and specifying the merged version in the config file as if this were a single scan. I haven't tried this myself, so do let me know if this works!

If in addition to 2 DWIs you also had 2 anatomicals, you could try the new longitudinal option, which reconstructs tracts from multiple data sets at once. With only one anatomical, this would require some mild hacks but could still be done in principle (again, never tried it).

Or you could try quantifying which of the two DWI scans has the least motion of the 2 and only use that one.

Hope this helps, a.y

On Mon, 4 Mar 2013, Jon Wieser wrote:

...

hello,

we have acquired dti scans on a subject during a FMRI experiment. is it possible to process both dti's with tracule to get an average of the 2 dti's? If so, how do I setup the config file for this? Thanks Jon _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

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