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Hi, What do you mean by rotate here? Or do you want the mask flipped over to the other side? And is the mask in a single subject's structural space or in the MNI152 standard space? The latter is very easy to flip (with fslswapdim) and then you can "merge" by adding them together with fslmaths. Otherwise, you'll need to use some flirt matrices to standard space to assist with the flipping. All the best, Mark On 15 Feb 2008, at 10:08, Hallvard Røe Evensmoen wrote: > I have drawn a mask for the MTL on the right side, and then i > wanted to > rotate this mask and merge it with the other, so that the left MTL is > masked as well. Any suggestions? > > > > Hallvard Røe Evensmoen >