12 DOF is probably not going to help much. I vaguely remember that there were some tools out there that would attempt to fit the non-linear parts of the B0 map. Maybe in fmriprep? Sorry, can't give you more guidance than that.

On 10/26/19 10:56 AM, Daniel Callow wrote:

External Email - Use Caution

Hello,

I am trying to do a within-subject co-registration between b0 volumes and T1's for my subjects. This is an old dataset that does not have anything for correcting b0 inhomogeneities. The registration using --dti and normal parameters for bbregister led to "okay" within-subject registration. I am wondering if modifying the --dof (like 12) option for bbregister or applying some type of linear/nonlinear registration might improve the registration?

Best, -- Daniel Callow PhD Student, Neuroscience and Cognitive Science Exercise for Brain Health Lab University of Maryland, College Park ddcc2442@gmail.commailto:ddcc2442@gmail.com 443-254-6298

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