Hi Shengwei,
The bmask file should contain a binary brain mask, not all zeros. The wfmag_* file is the forward warped field map magnitude image used for co-registration.
You can learn more about the FieldMap toolbox and get example data to establish a pipeline here: http://www.fil.ion.ucl.ac.uk/spm/toolbox/fieldmap/.
Best wishes,
Martina
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