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Hi - yes, the -g option refers to a vertical gradient on the -f option - if you want any other gradient you will need to reorient your image first. The usage lines says this ;-) Cheers. On 25 Mar 2009, at 14:24, Rolf Heckemann wrote: > I am getting different results from BET depending on the data ordering > in the NIfTI file. It appears that BET relies on the data ordering to > determine the vertical axis in the image. I would expect BET results > to be identical on pairs of files that only differ by the data > ordering. > > I've illustrated the problem on this page: > > http://www.soundray.org/betbugdemo > > > -- > Rolf A Heckemann, PhD > Research Associate > Division of Neuroscience and Mental Health > MRC Clinical Sciences Centre > Imperial College London > Hammersmith Hospital Campus > Du Cane Road > London W12 0HS > United Kingdom > 1237990828 > --------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------