Welcome to shimming-toolbox!
shimming-toolbox is an open-source Python software package enabling
a variety of MRI shimming (magnetic field homogenization) techniques
and real-time shimming for use
with standard manufacturer-supplied gradient/shim coils or with custom
"multi-coil" arrays. The toolbox provides useful set of command line tools as
well as a fsleyes plugin
dedicated to make shimming more accessible and more reproducible.
For more details, see: D'Astous A, Cereza G, Papp D, Gilbert KM, Stockmann JP, Alonso-Ortiz E, Cohen-Adad J. Shimming toolbox: An open-source software toolbox for B0 and B1 shimming in MRI. Magn Reson Med. 2022; 1-17. doi:10.1002/mrm.29528
- Built-in DICOM to NIfTI conversion
- Masking tools for the brain and spinal cord
- Create and use a variety of B0 shimming coil profiles: Spherical harmonics, shim-only arrays, "AC-DC" multi-coil, etc.
- Supports different B0 shimming scenarios: dynamic (slicewise), realtime (shim modulation with respiration), gradient z-shimming, two-region shimming (e.g., fat and brain)
- RF shimming for parallel transmit systems (a.k.a. B1+ shimming)
- Powered by freely available software tools: dcm2niix, dcm2bids, FSL-prelude, SCT, FSLeyes.
See the Installing shimming-toolbox page.
1. Graphical User Interface (FSLeyes)
shimming-toolbox features a graphical user interface (GUI) via a FSLeyes plugin.
2. Command Line
shimming-toolbox can be used on the the command line. For example:
$ st_prepare_fieldmap --help Usage: st_prepare_fieldmap [OPTIONS] PHASE... Creates fieldmap (in Hz) from phase images. This function accommodates multiple echoes (2 or more) and phase difference. This function also accommodates 4D phase inputs, where the 4th dimension represents the time, in case multiple field maps are acquired across time for the purpose of real-time shimming experiments. For non Siemens phase data, see --autoscale-phase option. PHASE: Input path of phase nifti file(s), in ascending order: echo1, echo2, etc. Options: --mag PATH Input path of mag nifti file [required] --unwrapper [prelude] Algorithm for unwrapping [default: prelude] -o, --output PATH Output filename for the fieldmap, supported types : '.nii', '.nii.gz' --mask PATH Input path for a mask. Mask must be the same shape as the array of each PHASE input. --threshold FLOAT Threshold for masking if no mask is provided. Allowed range: [0, 1] where all scaled values lower than the threshold are set to 0. --gaussian-filter BOOLEAN Gaussian filter for B0 map --sigma FLOAT Standard deviation of gaussian filter. Used for: gaussian_filter -v, --verbose [info|debug] Be more verbose -h, --help Show this message and exit.
To facilitate reproducibility, commands can be chained together in a pipeline using multiple Shimming Toolbox commands. An example script is provided.
The different commands of Shimming Toolbox can be found in the Command Line Tools page.