nu_estimate

estimate the non-uniformity field in an MRI volume

nu_estimate [options] <input.mnc> <output.imp>

DESCRIPTION

nu_estimate is a Perl script that estimates the non-uniformity (bias) field from an MRI volume using the N3 algorithm. The N3 method is a non-parametric approach that estimates the multiplicative bias field by sharpening the intensity histogram of the volume. The estimated field is output in a compact IMP format that can be evaluated on a volume grid using evaluate_field or applied using correct_field.

EXAMPLES

nu_estimate input.mnc field_estimate.imp

nu_estimate -mask brain_mask.mnc input.mnc field_estimate.imp

AUTHOR

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

COPYRIGHTS

Copyright &copy; 1998 by John G. Sled

SEE ALSO

nu_correct, nu_evaluate, evaluate_field, correct_field, spline_smooth, sharpen_hist