Radial Interstices Enable Speedy Low-Volume imagING

This is a reconstruction toolbox optimised for 3D ZTE MR images. There are many high quality MR recon toolboxes available, e.g. BART, but these are mostly optimised for 2D sequences. 3D non-cartesian sequences present unique challenges for efficient reconstruction, so we wrote our own.

This toolbox was presented at ISMRM 2020.

Authors

Tobias C Wood, Emil Ljungberg, Florian Wiesinger.

Installation

Pre-compiled executables are provided for Linux and Mac OS X in a .tar.gz archive from http://github.com/spinicist/riesling/releases. Download the archive and extract it with tar -xzf riesling-platform.tar.gz. Then, move the resulting riesling executable to somewhere on your $PATH, for instance /usr/local/bin. That's it.

• MacOS Catalina or higher users should use curl to download the binary, i.e. curl -L https://github.com/spinicist/riesling/releases/download/v1.0/riesling-macos.tar.gz. This is because Safari now sets the quarantine attribute of all downloads, which prevents them being run as the binary is unsigned. It is possible to remove the quarantine flag with xattr, but downloading with curl is more straightforward.
• The Linux executable is compiled on Ubuntu 18.04 and a statically linked libstdc++. This means it will hopefully run on most modern Linux distributions. Let us know if it doesn't.
• The Mac executable is compiled with MacOS 11. GitHub CI uses Intel machines, and a native M1 version will not be available until these changes.

Compilation

If you wish to compile RIESLING yourself, compilation should hopefully be straightforward as long as you have access to a C++20 compiler (GCC 10 or higher, Clang 7 or higher). RIESLING relies on vcpkg for dependency management. To download and compile RIESLING, follow these steps:

0. MacOS Dependencies

Install the MacOS vcpkg dependencies.

1. XCode from the AppStore
2. Run $ xcode-select --install in the terminal

You may also need to install pkg-config depending on your macOS version. This is easily installed with Homebrew using

$ brew install pkg-config

Apple Silicon (M1) is now supported.

0. Linux Dependencies

Install the Linux vcpkg dependencies. These include cmake, tar, curl, zip, unzip, pkg-config & build-essential. You may be surprised by which distributions do not include these by default.

1. Clone repository

$ git clone https://github.com/spinicist/riesling

2. Compile

In the riesling folder execute

$ ./bootstrap.sh

Usage

RIESLING comes as a single executable file with multiple commands, similar to git or bart. Type riesling to see a list of all the available commands. If you run a RIESLING command without any additional parameter RIESLING will output all available options for the given command.

RIESLING uses HDF5 (.h5) files. The nii command will convert to Nifti. To create an example digital phantom, use riesling phantom. RIESLING will append suffixes to input filenames when writing outputs to indicate which command was executed.

For simple non-iterative recon use riesling recon. For regularized leat-squares reconstruction use riesling admm. The default settings for this will use Total Variation regularization, i.e. compressed-sensing.

A separate examples repository https://github.com/spinicist/riesling-examples contains Jupyter notebooks demonstrating most functionality. These can also be run on the mybinder website.

Documentation & Help

Documentation is available at https://riesling.readthedocs.io.

If you can't find an answer there or in the help strings, you can open an issue, or find the developers on Twitter (@spinicist) or e-mail [email protected].