You can try lta_convert.

Best,

Yujing

From: freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edu> On Behalf Of Mirsol Choi
Sent: Wednesday, November 29, 2023 5:19 PM
To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>
Subject: [Freesurfer] Converting register.dat file to reg.lta

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Hello there, 

I am wondering if there is a way to convert register.dat file produced from dt_recon to reg.lta. I need a reg.lta file that contains registration between the DTI data and processed (recon-all) T1 data. 

I have tried to perform bbregister, but the alignment is completely off.

Thank you so much for your time!

Mirsol