epyg 0.2.0

Python implementation of the Extended Phase Graph algorithm for simulation of MRI signals

EpyG - Extended Phase Graphs in Python

Author: Daniel Brenner, (formerly) DZNE Bonn, Started in: 2016, continued in 2022

Extended Phase Graphs (EPG) are mathematical model of the signal evolution in magnetic resonance with particular applications imaging (MRI). This python implementation of the EPG formalism aim at being usable from a user perspective, being suited for educational uses as well as providing adequate performance to allow 'real' applicaltions e.g. for more "heavy" simulations. The overall implementation follows the Operator notation as e.g. shown by Weigel.

The code is currently works in progress! Use with great care!

Installation

EpyG is a pure python module built upon numpy.

it uses poetry as build and distribution tool.

Package structure

The EpyG package is structured in 3 modules

• EpyG - the actual representation of an Extended Phase Grap
• Operators - implementation of Operators that manipulate EpyG
• Applications - combinations of operators and looping to simulate real life MRI problems

First steps

For first steps it is advised to look at the example ipython/jupyter notebook(s) in the examples directory

Testing

The folder tests/ contains a set of unit/integration tests to prove basic functionality. Further application examples can be found in the examples subfolder where Jupyter notebooks illustrating the major concepts are distributed