# fixel2sh¶

## Synopsis¶

Convert a fixel-based sparse-data image into an spherical harmonic image

## Usage¶

fixel2sh [ options ]  fixel_in sh_out

• fixel_in: the input fixel data file.
• sh_out: the output sh image.

## Description¶

This command generates spherical harmonic data from fixels that can be visualised using the ODF tool in MRview. The output ODF lobes are scaled according to the values in the input fixel image.

The spherical harmonic coefficients are stored according the conventions described the main documentation, which can be found at the following link: https://mrtrix.readthedocs.io/en/3.0_RC3/concepts/spherical_harmonics.html

## Options¶

• -lmax order set the maximum harmonic order for the output series (Default: 8)

### 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).