Generate an appropriate response function from the image data for spherical deconvolution


sh2response [ options ]  SH mask directions response
  • SH: the spherical harmonic decomposition of the diffusion-weighted images
  • mask: the mask containing the voxels from which to estimate the response function
  • directions: a 4D image containing the direction vectors along which to estimate the response function
  • response: the output axially-symmetric spherical harmonic coefficients


  • -lmax value specify the maximum harmonic degree of the response function to estimate
  • -dump file dump the m=0 SH coefficients from all voxels in the mask to the output file, rather than their mean

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.
  • -nthreads number use this number of threads in multi-threaded applications (set to 0 to disable multi-threading).
  • -help display this information page and exit.
  • -version display version information and exit.

Author: J-Donald Tournier (

Copyright: Copyright (c) 2008-2018 the MRtrix3 contributors.

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MRtrix3 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.

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