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I've never seen such an option with the product DTI sequence. On Fri, 2011-06-17 at 06:17 +0200, Martin Kavec wrote: > Thanks a lot for the info, Michael and Andreas. Still a question on > DTI. I suppose that at VB17 software the DTI sequence uses the double > refocusing, since the TE is about 100 ms. Is there any option to turn > it off and thus shorten the TE? The only place where I would expect it > is would be possible to change is Diffusion Mode, but no option really > fit this idea. > > Thanks in advance for help, > > Martin > > On Fri, Jun 17, 2011 at 12:33 AM, Andreas Bartsch > <[log in to unmask]> wrote: > > hi, > >>Should it also be in A>>P? > > the phase encoding of the GE fieldmaps should not matter, i.e. it can be different from the EPI, even though i tend use the same settings for the two - except that i tend to acquire a few more slices on the fieldmap. > > hth, > > andreas > > > > ________________________________________ > > Von: FSL - FMRIB's Software Library [[log in to unmask]] im Auftrag von Martin Kavec [[log in to unmask]] > > Gesendet: Donnerstag, 16. Juni 2011 23:20 > > An: [log in to unmask] > > Betreff: [FSL] Field map for fMRI and DTI on Siemens > > > > Hi all, > > > > Before I start re-inventing a wheel: I see there is a field mapping > > sequence on Siemens Verio VB17. Anybody has experience in using it for > > unwarping fMRI and DTI (e.g. in the presurgical protocol)? > > Interestingly, the default fMRI sequences have A>>P phase encoding > > direction, but the field mapping sequence is encoded in R>>L > > direction. Should it also be in A>>P? How do I know the field map > > unwarp is being applied on the fMRI and DTI series? > > > > Thanks for sharing your experiences. > > > > Cheers, > > > > Martin