Model an input image using low frequency 3D polynomial basis functions


mrmodelfield [ options ]  input output
  • input: the input image
  • output: the output image representing the fit


This command was designed to estimate a DWI bias field using the sum of normalised multi-tissue CSD compartments.


  • -mask image use only voxels within the supplied mask for the model fit. If not supplied this command will compute a mask

Standard options

  • -info display information messages.
  • -quiet do not display information messages or progress status.
  • -debug display debugging messages.
  • -force force overwrite of output files. Caution: Using the same file as input and output might cause unexpected behaviour.
  • -nthreads number use this number of threads in multi-threaded applications (set to 0 to disable multi-threading)
  • -failonwarn terminate program if a warning is produced
  • -help display this information page and exit.
  • -version display version information and exit.

Author: David Raffelt ( & Rami Tabbara (

Copyright: Copyright (c) 2008-2017 the MRtrix3 contributors

This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, you can obtain one at

MRtrix is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

For more details, see