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Dear all, I read multiple posts on converting coordinates but I couldn't quite find what I wanted. I have an image (representing group difference in activation) outputted from a dual regression procedure, so it's already in MNI space. I want to overlay it on a standard MNI image, but using fslsize I see that they have different coordinates. How can I change the image's coordinates to match that of the MNI152 image? I tried using fslswapdim but I get an error of invalid dimension numbers. coordinates of my image: dim1 45 dim2 54 dim3 45 dim4 1 pixdim1 4.0000000000 pixdim2 4.0000000000 pixdim3 4.0000000000 pixdim4 1.0000000000 coordinates of MNI152 standard image: dim1 91 dim2 109 dim3 91 dim4 1 pixdim1 2.0000000000 pixdim2 2.0000000000 pixdim3 2.0000000000 pixdim4 1.0000000000 If it is correct to use fslswapdim, then how must I write the <a> <b> <c> values to correctly change the dimensions to match that of the MNI152 image? Would I then be able to overlay the two images in fslview? As a side note, I tried using FLIRT instead to register the two images but it was giving me suboptimal results. Thanks a lot!! Helen