Hi Joe,
quick take on that: don't use the "moco" series as it contains both - the pro- and retrospective correction, i.e. you would interpolate twice if you realign again.
W/r to unwarping B0-motion interactions: it is a very cool idea (compliment to Jesper) but is prone to be an overkill. So if you unwarp distortions and do motion correction, it does not make sense to do on top. Similarly, I would in fact probably not include the motion estimates into the model but Jesper will know better.
Cheers-
Andreas
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Von: FSL - FMRIB's Software Library [[log in to unmask]] im Auftrag von Joe Devlin [[log in to unmask]]
Gesendet: Freitag, 25. September 2009 12:58
An: [log in to unmask]
Betreff: [FSL] Recommendations for Jesper's unwarping with PACE
Hi Jesper,
If I recall correctly, for dealing with head motion, you recommend
that people either use your realign & unwarp tool or add estimated
motion parameters into the statistical model as covariates, but not
both. Is that correct?
Do you have any recommendation if the data were acquired with
prospective motion correction (PACE on Siemen's machines)? This came
up the other day when I learned that one of my colleagues was
acquiring her EPI data using PACE, then using your realign and unwarp
code, and then including the residual motion estimates in the model.
Seemed like overkill but I thought it worth getting a more informed
opinion.
Thanks!
Joe
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