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Quantitative susceptibility mapping allows the determination of a basic physical property in vivo. Early concepts for QSM were introduced a decade ago and more refined methods have been proposed recently to allow the calculation of magnetic susceptibility from a single orientation, in a clinical setup, and with low reconstruction artefacts. Therefore, QSM has attracted a high number of researchers and is utilized in clinical studies of neurological disorders and is increasingly becoming a topic of research outside the brain.
 

 

Graz TGV QSM Algorithm 

Described in: ** Langkammer, C; Bredies, K; Poser, BA; Barth, M; Reishofer, G; Fan, AP; Bilgic, B; Fazekas, F; Mainero; C; Ropele, S
Fast Quantitative Susceptibility Mapping using 3D EPI and Total Generalized Variation.
Neuroimage. 2015 May 1;111:622-30. doi: 10.1016/j.neuroimage.2015.02.041. PubMed 

Download: Python source code for total generalized variation (TGV) based QSM including 3D EPI test data (68 MB) from the paper.

Alternatively, there are docker and singularity images and a description how to use  tgv_qsm in Windows Subsystem for Linux (WSL 1.0) available. Kindly provided by Steffen Bollmann.

Siemens has a WIP package for Aera, Skyra, Verio and Prisma scanners (WIP 1122A QSM) implemented by Kieran O’Brien.

Related: Martin Soellrad's R2* mapping and correction toolbox based on the MRM paper.

 

Machine learning based QSM Algorithms (Deep QSM)

We are involved in the development of DeepQSM and SHARQnet. Stefan Bollmann has a python version of DeepQSM online in a Jupyter/Colab notebook, which can be tested directly in the browser without installation and GPU.

Stefan Heber has written a DeepQSM extension, where background field removal and dipole inversion are performed in a single feed forward network architecture

 

Overview of QSM Algorithms

There is a nice overview of QSM software currently available from Mathieu Boudreau as well as a summary of deep learning based QSM algorithms.

 

 

QSM Reconstruction Challenge 2.0 (Seoul 2019)

The 2nd QSM challenge took place at the QSM workshop in Seoul. More information can be found at the conference webpage.

QSM Reconstruction Challenge 1.0 (Graz 2016)

MRI data and Matlab source code: qsm_recon_challenge_2016.zip (240 MB).

Paper of the QSM reconstruction challenge: mrm26830.pdf (MRM webpage:  http://onlinelibrary.wiley.com/doi/10.1002/mrm.26830/full).

 

 

4th QSM Workshop in Graz in 2016

We thank all participants of the 4th International Workshop on MRI Phase Contrast & Quantitative Susceptibility Mapping in Graz!
Pictures and program at the homepage of the QSM workshop 2016.

 

 

This site: http://qsm.neuroimaging.at/