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Hi - GE AP/PA data is not recommended because this has the serious dropouts in the areas being most affected also by distortions - have you checked in those areas for performance of the unwarping? This email list is the best venue for sending these questions, Cheers, Steve. > On 22 Aug 2017, at 06:54, Johan <[log in to unmask]> wrote: > > Dear experts, > > If I have a rather complicated question regarding Topup, SpinEcho Fieldmaps with AP / PA phase encoding directions, who would you suggest I contact? > > I have some data that i'd like to send. We obtained GE and SE AP and PA scans, and although SE AP/PA combination pair is recommended, for our case GE AP/PA seems to work better. We're not confusing this with the dual-echo B0 Fieldmaps. > > Thanks and best wishes > Johan --------------------------------------------------------------------------- Stephen M. Smith, Professor of Biomedical Engineering Head of Analysis, 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 <http://www.fmrib.ox.ac.uk/~steve> --------------------------------------------------------------------------- Stop the cultural destruction of Tibet <http://smithinks.net/>