HI Following from my previous question I have a slightly different enquiry. Later on I want to warp images form other imaging modalities, including FA maps. Can I get away with using the warp fields based on the segmented grey / white matter images on these alternative imaging modalities, or would I need to use the images of that specific modality to compute the warps. I ask because FA images are sensitive to anatomical features which would not be visible in the segmented T1 images. A warp based on segmented T1 may mis-localise these features. I just want to know if anyone thinks this is something that is worth worrying about? Many thanks Mark -- -- Mark Drakesmith Research Associate Caridff University Brain Research Imaging Centre (CUBRIC) School of Psychology Cardiff University Park Place Cardiff CF10 3AT Tel: +44 (0) 29 2087 0354 Fax: +44 (0) 29 2087 0339