You can load the surface maps into matlab. If they are stored in .w format, then you can

[w,v] = read_wfile(wfname);

% w - vector of surface values % v - vector of vertex indices (0-based)

You can also compute the overlap in the volume and then paint that. mri_vol2surf uses nearest neighbor, so there's not issue of interpolating non-coninuous values.

doug

Ramapriyan Pratiwadi wrote:

hi all -

i've succeeded in displaying FSL z-maps on an inflated brain. however, i'm trying to find a way to display the overlap between two z-maps. i was able to get one to display in red, and the other in blue, with the overlap being purple. however, this doesn't look very convincing, and it would be more helpful to calculate the total number of points in each z-map, and then how many points are in common.

is there a way to do this within the freesurfer environment, or even in matlab or idl ?

thanks,

Ram

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