Your understanding is correct. This was the convention when I started working with FS 18 years ago. It's hard to change :)

On 05/11/2016 03:09 PM, Michael Waskom wrote:

Hi Freesurfers,

I have a question about the direction of the transformation written out to the register.dat file by bbregister.

I have looked at the fscoordinates powerpoint presentation, which I think is telling me that this matrix actually maps from the orig.mgz RAS coordinates to the functional RAS coordinates. That agrees with the results I get when I try to use the matrix outside of Freesurfer. However, this is a little surprising, because I think of the bbregister process as aligning the functional (moving) with the anatomy (target) so I would have expected the transform matrix to represent that mapping.

Can you please confirm whether my understanding of the fscoordinates presentation is correct, or help me out if I am off base?

Thanks! Michael

---

Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer