qsiprep.workflows.fieldmap.fmap module

Direct B0 mapping sequences

When the fieldmap is directly measured with a prescribed sequence (such as SE), we only need to calculate the corresponding B-Spline coefficients to adapt the fieldmap to the TOPUP tool. This procedure is described with more detail here.

This corresponds to the section 8.9.3 –fieldmap image (and one magnitude image)– of the BIDS specification.

qsiprep.workflows.fieldmap.fmap.init_fmap_wf(name='fmap_wf')[source]

Fieldmap workflow - when we have a sequence that directly measures the fieldmap we just need to mask it (using the corresponding magnitude image) to remove the noise in the surrounding air region, and ensure that units are Hz.

(Source code)