Dear Michel,
Is is impossible to change the acquisition, so your second suggestion would be a solution. However, I don't understand this. The eddy-current correction tool operates on each volume separately by matching each volume to a reference volume, i.e., the B0 volume. So inserting average volumes will not result in a better match for the invidual volumes. Moreover, taking the average of volumes which are displaced from each other will make no real sense: the average will be blurred.
Regards,
Ed
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