Hi Angela,
The extreme values of the shift map might not represent typical values, so it is difficult to judge purely from this. It is best to judge things by how good the final registrations are.
All the best,
Mark
On 10 Feb 2014, at 15:44, Angela Ianni <[log in to unmask]> wrote:
> I'm having trouble using b0 field maps acquired on a GE scanner to work with FUGUE. I have a real fieldmap image in rads/sec with data in the range of -3000 to +3000. I also have an accompanying magnitude image with values ranging from 0-25000. I've brain extracted the magnitude image and applied that mask to the fieldmap image.
>
> The Feat output from the unwarping process shows an unwarping shift map that goes up to 15 voxels, which makes me suspicious that there is a scaling problem with the GE data. If anyone has experience using GE field maps with FSL and can offer any suggestions, I would very much appreciate the help.
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