Hi,
if you don't want to rely on voxel indices, spm_read_vols also returns mm coordinates for your image matrix:
[Y,XYZmm] = spm_read_vols(X_hdr);
You can then use
Y(XYZmm(1,:)>0)=0;
or
Y(XYZmm(1,:)<=0)=0;
to zero right or left hemisphere.
Best,
Volkmar
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