FIX: Mask fieldmap before fitting spline field #396
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Previously, we fit a spline field to the within-mask portion of a fieldmap, which could lead to large peaks outside the mask. Applying the mask to the reconstructed field can produce discontinuities in resampling. Instead of attempting to attenuate the peaks outside the mask in a smooth way, we set the fit values outside the mask to zero, and let the spline fit find a smooth field. In practice, we've found that even fields with large peaks on the edge of the mask are well fit by this method.
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As discussed, going ahead with this option. This will be in the next unstable release of fmriprep. |
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FIX: Mask fieldmap before fitting spline field [backport gh-396]
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Previously, we fit a spline field to the within-mask portion of a fieldmap, which could lead to large peaks outside the mask. Applying the mask to the reconstructed field can produce discontinuities in resampling. Instead of attempting to attenuate the peaks outside the mask in a smooth way, we set the fit values outside the mask to zero, and let the spline fit find a smooth field.
Replaces #395.
Addresses nipreps/fmriprep#3013.
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