open-discussion > Fieldmap corrections - before or after SLOMOC
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Apr 21, 2015  09:04 PM | Gabe Castillo
Fieldmap corrections - before or after SLOMOC
I'm curious as to when slomoco should be run in relation to fieldmap corrections, before or after?

My followup question is in regards to slice-time correction. After looking at the forums, it seems that slice-time correction should be applied AFTER slomoco, but was hoping to get a definitive answer.

Thanks in Advance,
  Gabe
Apr 22, 2015  09:04 PM | Erik Beall
RE: Fieldmap corrections - before or after SLOMOC
Hi Gabe,

Yes, slice-timing correction should be applied AFTER slomoco. Both slomoco and PESTICA perform regressions on the data that require the timing information across slices to be un-altered as much as possible, which rules out slice-timing correction, 3D spatial filtering and spatial normalization.

You can however run 3dvolreg or another volumetric realignment method prior to slomoco/pestica/any other slice-specific nuisance regression method but that would be the most I'd do before these or any other slice-specific nuisance regressions (see Jones TB et al http://www.ncbi.nlm.nih.gov/pubmed/18583...).

Erik