nu_correct

correct intensity non-uniformity artifacts in MRI volumes

nu_correct [options] <input.mnc> <output.mnc>

DESCRIPTION

nu_correct is the main command of the N3 (Non-parametric Non-uniform intensity Normalization) package. It corrects intensity non-uniformity (bias field) artifacts in MRI volumes. The N3 algorithm iteratively estimates and removes the smooth, multiplicative bias field that is a common artifact in MR images due to RF coil inhomogeneity and other factors.

nu_correct is a Perl script that orchestrates the full correction pipeline, calling nu_estimate to estimate the field, evaluate_field to evaluate it, and correct_field to apply the correction. It supports iterative refinement of the field estimate.

EXAMPLES

nu_correct input.mnc output_corrected.mnc

nu_correct -mask brain_mask.mnc input.mnc output_corrected.mnc

AUTHOR

John G. Sled - McConnell Brain Imaging Centre, Montreal Neurological Institute, McGill University.

COPYRIGHTS

Copyright &copy; 1998 by John G. Sled

SEE ALSO

nu_estimate, nu_evaluate, correct_field, evaluate_field, spline_smooth, sharpen_volume