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fmriprep.workflows.fieldmap.fmap
fmriprep.workflows.fieldmap.phdiff
In the absence of direct measurements of fieldmap data, we provide an (experimental) option to estimate the susceptibility distortion based on the ANTs symmetric normalization (SyN) technique. This feature may be enabled, using the --use-syn-sdc flag, and will only be applied if fieldmaps are unavailable.
During the evaluation phase, the --force-syn flag will cause this estimation to be performed in addition to fieldmap-based estimation, to permit the direct comparison of the results of each technique. Note that, even if --force-syn is given, the functional outputs of FMRIPREP will be corrected using the fieldmap-based estimates.
Feedback will be enthusiastically received.
fmriprep.workflows.fieldmap.init_nonlinear_sdc_wf