It needs a registration matrix that goes from the volume to the surface space (defined by the orig volume). If you traced your mask on the orig volume (or something derived from it), then you can create an identity matrix:

-----------cut here ---------------- yoursubjectname 1 1 1 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 round ---------- cut here -----------

If the volumes are not the same, then you'll need to create a matrix. See tkregister2 --help.

doug

Fornito, Alexander wrote:

Hi, I'm trying apply ROI masks that I've manually traced in volume space to the same image's surface using mri_vol2surf. mri_vol2surf seems to requires a register.dat file, and I'm unsure what needs to be registered, since the volume that I traced the masks on is exactly the same as the one that I began with to create the surface (so presumably they are in the same space?) . Any hints would be appreciated. Thanks, Alex

---

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