The ScGrog Package

Introduction

Self-calibrating GROG is a technique for calculating unit kx and ky stepping GRAPPA operators (usually called Gx and Gy) which can be used in the regular GROG method.

The original GROG method was first published by Seiberlich et. al. in 2007 and the self-calibrating theory for radial data was worked out by the same group in 2008.

This package contains several key components which are explained in the following sections.

NPM

This package uses the node package manager to manage its version control and dependencies. To use this package simply:

1. Install Node: https://nodejs.org/en/

2. Run npm install sc-grog at a unix-like terminal.

This will automatically download the files for this package (and the packages it depends on) into a node_modules folder. If you add this folder to your MATLAB path the package ScGrog will be available.

It is crucial to note the difference in naming conventions between MATLAB and NPM. The npm package name is sc-grog and the MATLAB package name is +ScGrog. If you are new to MATLAB packages please learn more about them here: http://www.mathworks.com/help/matlab/matlab_oop/scoping-classes-with-packages.html.

Tests

To make sure this software works as expected in the present environment, tests have been provided and can be run by executing ScGrog.test. These tests provide a very basic data-in data-out testing and it's these example data files that take up the bulk of the size of this repository.

Since all test data is stored in +tests/private, the files in this folder should not be version controlled. You need to tell your local git to not track changes in them via git update-index --assume-unchanged as described here: http://stackoverflow.com/questions/12288212/git-update-index-assume-unchanged-on-directory.

If you want to contribute to this project please keep tests in mind and do not commit any new data without telling git to "assume-unchanged" to avoid bloating the .git file.

Docs

In the docs/ directory a markdown file is provided explaining how to use the function this package provides.