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Hi - I would be concerned about this - once you have subtracted the tag vs control timepoints there should be no drift in ASL data? Cheers, Steve. On 24 Jul 2009, at 17:28, Crystal Franklin wrote: > I am working on a set of ASL data that appears to have a linear > drift with > time. Is there any tools in FSL I can use to correct for this? > > Crystal > --------------------------------------------------------------------------- Stephen M. Smith, Professor of Biomedical Engineering Associate Director, Oxford University FMRIB Centre FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK +44 (0) 1865 222726 (fax 222717) [log in to unmask] http://www.fmrib.ox.ac.uk/~steve ---------------------------------------------------------------------------