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dropout On 6 May 2014, at 13:03, Satrajit Ghosh <[log in to unmask]> wrote: > hi, > > across a bunch of threads on this list, it has been stated that topup should not be used with gradient echo images with opposing/differential phase encoding directions and that FOV/distortion matched spin-echo images should be used. > > could someone please clarify why this might be the case? > > also if it has to do with the differing flip angles and longitudinal relaxation, would topup be reasonable to use for a sparse gradient echo collection (scan wait scan wait ...) with 90 degree flips? > > cheers, > > satra > --------------------------------------------------------------------------- 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 --------------------------------------------------------------------------- Stop the cultural destruction of Tibet