# warpinvert¶

## Synopsis¶

Invert a non-linear warp field

## Usage¶

warpinvert [ options ]  in out

• in: the input warp image.
• out: the output warp image.

## Description¶

By default, this command assumes that the input warp field is a deformation field, i.e. each voxel stores the corresponding position in the other image (in scanner space), and the calculated output warp image will also be a deformation field. If the input warp field is instead a displacment field, i.e. where each voxel stores an offset from which to sample the other image (but still in scanner space), then the -displacement option should be used; the output warp field will additionally be calculated as a displacement field in this case.

## Options¶

• -template image define a template image grid for the output warp
• -displacement indicates that the input warp field is a displacement field; the output will also be a displacement field

### Standard options¶

• -info display information messages.
• -quiet do not display information messages or progress status; alternatively, this can be achieved by setting the MRTRIX_QUIET environment variable to a non-empty string.
• -debug display debugging messages.
• -force force overwrite of output files (caution: using the same file as input and output might cause unexpected behaviour).
• -config key value (multiple uses permitted) temporarily set the value of an MRtrix config file entry.
• -help display this information page and exit.
• -version display version information and exit.

### References¶

Tournier, J.-D.; Smith, R. E.; Raffelt, D.; Tabbara, R.; Dhollander, T.; Pietsch, M.; Christiaens, D.; Jeurissen, B.; Yeh, C.-H. & Connelly, A. MRtrix3: A fast, flexible and open software framework for medical image processing and visualisation. NeuroImage, 2019, 202, 116137

Author: Robert E. Smith (robert.smith@florey.edu.au) and David Raffelt (david.raffelt@florey.edu.au)