Identifying field-mapping resources¶
Base fieldmap estimation¶
- Subject can have phase-difference data.
- Subject can have a fieldmap acquisition.
-
fmriprep.workflows.fieldmap.base.
fmap_estimator
(fmap_bids, settings=None)[source]¶ This workflow selects the fieldmap estimation data available for the subject and returns the estimated fieldmap in mm, along with a corresponding reference image. Current implementation applies the first type of fieldmap estimation found in the following order of precedence:
- “Natural” fieldmaps
- Phase-difference fieldmaps
Outputs:
- fmap
- The estimated fieldmap itself IN UNITS OF Hz.
- fmap_ref
- the anatomical reference for the fieldmap (magnitude image, corrected SEm, etc.)
- fmap_mask
- a brain mask for the fieldmap