Hi Francesco If you use the imcalc utility, for one image i1>3 would give you a binary output image where any voxel with a value over 3 in the selected image is labeled 1, and other voxels 0. For a conjunction you can simply multiply these maps: (i1>3) .* (i2>3) .* (i3>3) should give you a binary image of voxels that are > 3 in all three images. Hope this helps! Jonathan On Sunday, May 10, 2009, francesco de Bertoldi <[log in to unmask]> wrote: > Dear colleagues > > I'm trying to find a simple method in order to create a binary map > of common voxels between different t-maps at the same threshold. > With Marsbar I can do it but only with single clusters. > Someone knows how can I do it? > > best > > Francesco >