Try to specify –src <> and –trg <>             

--src

    specify src image geometry (mov volume for TKREG/register.dat)

--trg

    specify trg image geometry

From: freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edu> On Behalf Of Mirsol Choi
Sent: Wednesday, November 29, 2023 5:32 PM
To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>
Subject: Re: [Freesurfer] Converting register.dat file to reg.lta

        External Email - Use Caution        

Hi Yujing, 

I really appreciate your quick response. 

The following is the error I get when I try to perform this:

Mirsols-MacBook-Pro:dtrecon mirsolchoi$ lta_convert --inreg register.dat --outreg reg.lta

7.4.1

--inreg: register.dat input TK REG transform.

--outreg: reg.lta output reg.dat matrix.

INFO: This REGISTER_DAT transform is valid only for volumes between  COR types with c_(r,a,s) = 0.

error: corRead(): can't open file /Users/mirsolchoi/Desktop/subjects/sub-001/dtrecon/COR-.info

ERROR readREG: cannot read src MRI

Mirsols-MacBook-Pro:dtrecon mirsolchoi$ 

Is there an additional file I need to complete this process?

Thank you so much for your time.

Mirsol 

On Wed, Nov 29, 2023 at 3:24 PM Huang, Yujing <YHUANG43@mgh.harvard.edu> wrote:

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

        External Email - Use Caution        

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

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