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Do you mean applied to EPI automatically at the scanner itself, as part of Siemen's 3D Neuro tool (or whatever it is called)? I have no idea if that is possible, as I've never used any of the Neuro tool capabilities. cheers, -MH On Thu, 2011-06-16 at 23:34 +0200, Martin Kavec wrote: > Thanks Michael. A good point. Is the field map applied automatically > or do you have to make some adjustment in the fMRI protocol? Sorry if > this is simple, but I am just starting with Siemens. > > Cheers, > > Martin > > On Thu, Jun 16, 2011 at 11:25 PM, Michael Harms <[log in to unmask]> wrote: > > Regarding the phase encoding direction, I use P>>A for EPI (and the > > field map) on new protocols that I set up, so that the signal in the > > orbitofrontal cortex is expanded forward, rather than compressed back on > > itself. > > > > cheers, > > -MH > > > > On Thu, 2011-06-16 at 23:20 +0200, Martin Kavec wrote: > >> 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 > >