param2grid

Convert spherical harmonic parameters to deformation grid.

param2grid <parameters> <output_grid.mnc> [options]

DESCRIPTION

param2grid evaluates a spherical harmonic parameter file (produced by fit_harmonics_grids or related tools) on a regular 3D grid and writes the resulting deformation field as a MINC volume. The output grid can then be used to correct geometric distortions by applying it as a nonlinear transform in resampling tools.

A reference MINC file can be provided with --like to define the output grid geometry. Alternatively, a uniform step size can be specified.

OPTIONS

--verbose

Print progress information during processing.

--clobber

Overwrite the output file if it already exists.

--like file

Use the specified MINC file as a template for the output grid geometry (dimensions, voxel size, start coordinates, direction cosines).

--step val

Set the voxel step size (in mm) for the output grid.

EXAMPLES

# Generate a correction grid from fitted parameters
param2grid distortion.par correction_grid.mnc --like reference.mnc

# Generate a grid with a specific step size
param2grid distortion.par correction_grid.mnc --step 2.0

AUTHOR

Vladimir S. Fonov - McConnell Brain Imaging Centre, Montreal Neurological Institute.

COPYRIGHTS

Copyright © 2009-2024 by Vladimir S. Fonov

SEE ALSO

fit_harmonics_grids , c_param2grid