Hello,
This is an artefact arising from a combination of unwarping using spline interpolation and a restricted field of view.
Kind Regards
Matthew
> Dear all
> I used fsl_prepare_fieldmap to correct my fMRI data:
>
> fsl_prepare_fieldmap SIEMENS phasediferenceimage \
> fmap_mag_brain output 4.76
>
> (i have checked my phasedifference image and its range is between 0 and 4096 and my magnitude fieldmap is fully brain extracted)
> but
> after inputing the phase output and magnitude to the B0 unwarping section in FEAT, the resulting filtered_func_data and its timesseries looks weird. the first and last slice is like chess board. i know i have inserted true echo spacing and TE for my EPI, the attached images maybe explain my problem better
>
> does anyone have any experiences regarding to this issue?
>
> P.S: i am using partial FOV
>
>
> <filtered_func_data.png><example_func.png>
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