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Hi - yes you do need to adjust your bvecs before feeding them into DTIfit or bedpostx. Cheers. On 22 May 2009, at 09:57, <ERIK> <O'Hanlon> wrote: > Dear FSL experts, > > We are just starting to acquire DTI data in 60 directions on a > Philips 3T system. The images > are acquired in the axial plane but are angled by about 20 degrees > to remove the nasal > cavity artefacts as much as possible and also to capture the entire > cerebellum with out > adding more slices (and hence increasing time which is already at 22 > mins). Will this > angulation cause a problem during the analysis and do I need to > correct for this before I > process the data? If so how do I go about changing the bvec file to > reflect the angle? and at > what stage in the pipeline (initially , after eddy correction, after > DTI fit , before bedpost?). > > Thanking you in advance and any advice would be much appreciated. > > Erik > --------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------