 |
 |
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