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Dear FSLers, I have DTI data (in-vivo, 6 directions, 7T) from 6 mice, which I processed for eddy current correction, and DT fitting. It worked nicely for 4 out of the 6 volumes, but the 2 others had a global bias in V1 orientation. One volume appeared all red (V1 had an overall left/right direction), and the other volume appeared all blue (V1 were biased in the dorsal/ventral direction). Would there be a way of correcting (subtracting) these global biases? Would it be possible that the bias is produced by a global difference of intensity in some of the volumes encoding the 6 gradient directions? There's a jpg at http://dl.free.fr/q3VgvTUtr showing a single slice from B0-B7. Top half is a mouse that worked OK, bottom half a mouse with a left/right bias. thank you very much in advance! roberto