Hi Yong - If you do not have diffusion data, you won't be able to map your subjects' white matter tracts. In a T1 scan there is no contrast between white matter tracts that would allow you to segment them, as white matter looks uniform. All you could do is transform some generic labels from an atlas to your subjects.

a.y

________________________________ From: freesurfer-bounces@nmr.mgh.harvard.edu [freesurfer-bounces@nmr.mgh.harvard.edu] on behalf of Yong Li [yongli86@gmail.com] Sent: Friday, May 05, 2017 5:16 AM To: freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] TRACULA exports white matter tract labels without DTI data

Dear Anastasia, Dear Bruce,

As a newbie in using freesurfer, I would like to ask for help to output white matter tract labels of each subject without DTI data. This topic was briefly discussed last April by Holleran, Laurena (https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg46459.html), but I don't find how to do it. To be specific, I would like using TRACULA 'to mapping the tracts from the atlas onto the individual subject' as suggested by Bruce in his reply to Laurena.

Other questions are: How to view the extracted white matter tract labels in the individual space? freeview or trackvis or other viewers?

Could TRACULA deal with DTI data in Nifti format? If not, is there a way to reliably convert DTI data from Nifti to DICOM (*.dcm)?

Hope I make myself clear. Thank you very much in advance!

Best regards,

Yong