Dear FreeSurfer experts,

in the publication 'Accurate and robust brain image alignment using boundary-based registration', by Greve and Fischl (2009), in formula 2 a quantity termed N occurs. It is described as:'N is the total number of vertices participating'.

Can I find this N in the files created by BBR? I inspected the files and found in register.dof6.dat.sum the following entries:

Final costs ---------------- Number of surface hits XXXXX

and

nhits= XXXXX.

Both entries are equal and seem to be the N, which I am interested in. Can you please tell me if this is right.

Sincerely yours Joerg