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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