# fixel2peaks¶

## Synopsis¶

Convert data in the fixel directory format into a 4D image of 3-vectors

## Usage¶

fixel2peaks [ options ]  in out

• in: the input fixel information
• out: the output peaks image

## Description¶

If a fixel data file is provided as input, then the 3-vectors in the output image will be scaled based on the data in that file. If the input is instead the fixel directory, or the index or directions file, then all output 3-vectors will possess unit norm.

## Options¶

• -number value maximum number of fixels in each voxel (default: based on input data)
• -nan fill excess peak data with NaNs rather than zeroes

### 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).
• -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)

Copyright: Copyright (c) 2008-2021 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 http://mozilla.org/MPL/2.0/.

Covered Software is provided under this License on an “as is” basis, without warranty of any kind, either expressed, implied, or statutory, including, without limitation, warranties that the Covered Software is free of defects, merchantable, fit for a particular purpose or non-infringing. See the Mozilla Public License v. 2.0 for more details.

For more details, see http://www.mrtrix.org/.