Our diffusion data was acquired with a bed that had been reportedly vibrating. We want to make sure none of our results are correlated with motion.
After running eddy (from FSL/5.0) we end up with 6 motion (3 rotation & 3 translation) parameters, for each volume of the acquisition. If I want a single number from this acquisition, to be used as a regressor, or for correlations, how would I post-process this file?
It can't be as simple as averaging across all volumes, plus I don't know how to transform the 6 motion parameters into a single representative value, per volume. Any help on this would be great.
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