resample_grid

apply an arbitrary transform to a deformation grid

resample_grid <input> <xfm> <output.mnc> [options]

DESCRIPTION

resample_grid resamples a deformation grid (vector field) through a spatial transformation. The input is a MINC deformation grid file (a 3D vector field where each voxel stores an x, y, z displacement), and the transformation is specified as a MINC .xfm file. The output is a new deformation grid defined on the target sampling lattice.

This tool is useful for composing non-linear transformations, resampling deformation fields onto different grids, or converting deformation fields between coordinate systems. The --like option controls the output sampling grid geometry, and --invert inverts the .xfm transformation before applying it.

OPTIONS

--verbose

Print verbose information during processing.

--clobber

Overwrite the output file if it already exists.

--like file

Define the output sampling grid to match the geometry (dimensions, voxel spacing, starts, and direction cosines) of file.

--invert

Invert the .xfm transformation before applying it to the deformation grid.

--float

Store output voxels as 32-bit floating point.

--double

Store output voxels as 64-bit double-precision floating point.

EXAMPLES

Resample a deformation grid through a linear transform:

resample_grid deformation.mnc linear.xfm resampled_grid.mnc

Resample to match the geometry of a target volume:

resample_grid deformation.mnc transform.xfm output_grid.mnc --like target.mnc

Resample with an inverted transform and float output:

resample_grid deformation.mnc transform.xfm output_grid.mnc --invert --float --clobber

AUTHOR

Vladimir S. Fonov - Montreal Neurological Institute, McGill University.

COPYRIGHTS

Copyright (C) Vladimir S. Fonov, McConnell Brain Imaging Centre, McGill University.

SEE ALSO

itk_resample, itk_convert_xfm, mincresample, xfmconcat, xfminvert