DECAES is a fast Julia implementation of the MATLAB toolbox from the UBC MRI Research Centre for computing voxelwise T2-distributions from multi spin-echo MRI images using the extended phase graph algorithm with stimulated echo corrections. Post-processing of these T2-distributions allows for the computation of measures such as the myelin water fraction (MWF) or the luminal water fraction (LWF).

DECAES is written in the open-source Julia programming language. Julia and command line interfaces are available through this package. The examples repository additionally provides a MATLAB interface via the MATLAB function decaes.m.

If you use DECAES in your research, please cite our work:

• Doucette J, Kames C, Rauscher A. DECAES - DEcomposition and Component Analysis of Exponential Signals. Zeitschrift für Medizinische Physik 2020; 30: 271–278.

Using Julia v1.9 or later you can install DECAES as follows:

$ julia --project=@decaes -e 'import Pkg; Pkg.add("DECAES"); Pkg.build("DECAES")'

This will do two things:

1. Add DECAES.jl to a named Julia project environment separate from your global environment
2. Build the decaes launcher script at ~/.julia/bin for running DECAES from the command line

DECAES can then be run from the command line via decaes <COMMAND LINE ARGS>, provided ~/.julia/bin is added to your PATH. Run decaes --help for available arguments.

If you are new to DECAES, the best place to start is the examples repository. There, we provide:

• A walk-through tutorial for using the MATLAB and command-line DECAES interfaces
• Example multi spin-echo (MSE) data for demonstrating MWI processing

Find package documentation at the above link, which includes:

• The command line interface API, available command line arguments, and examples
• API reference detailing how to use DECAES.jl from within Julia
• Other internals and algorithmic details

Due to performance optimizations enabled by Julia, DECAES is fast. As an illustration, here is a comparison between DECAES and UBC MWF MATLAB toolbox T2-distribution computation times for two multi spin-echo (MSE) datasets:

If you use DECAES in your research, please cite our work:

@article{DECAES.jl-2020,
  title = {{{DECAES}} - {{DEcomposition}} and {{Component Analysis}} of {{Exponential Signals}}},
  author = {Doucette, Jonathan and Kames, Christian and Rauscher, Alexander},
  year = {2020},
  month = may,
  issn = {1876-4436},
  doi = {10.1016/j.zemedi.2020.04.001},
  journal = {Zeitschrift Fur Medizinische Physik},
  keywords = {Brain,Luminal Water Imaging,MRI,Myelin Water Imaging,Prostate},
  language = {eng},
  pmid = {32451148}
}