hi holly, you can average labels in a common surface space with mris_spherical_average. when you say you used mri_surf2vol, though, it sounds like you have these labels in volume space? good luck, oliver

Holly Bridge wrote:

We have an ROI for V1 of each of 10 subjects that we have transformed onto the surface of fsaverage with mri_surf2vol. Now we would like to sum these binary masks to produce a single mask with values from 0 to 10 corresponding to the overlap of the individual masks on the average surface.

Is there a way to do this with freesurfer tools or do we need to invoke fslmaths from the FSL tools?

Thanks, Holly --------------------------------------------------------------------------------------------------- Dr Holly Bridge

Royal Society University Research Fellow FMRIB Centre Tel: +44-1865-222582 John Radcliffe Hospital Headington Oxford OX3 9DU Email: hb@fmrib.ox.ac.uk

Lecturer and JRF, New College