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Indeed! This was an animal study, and it just so happened that that an element of the heating system was placed over the preamps of the coil therefore causing this drift. peter -----Original Message----- From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On Behalf Of Steve Smith Sent: Saturday, July 25, 2009 8:32 AM To: [log in to unmask] Subject: Re: [FSL] Linear Drift 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 ---------------------------------------------------------------------------