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Physics-Aware Motion Simulation For T2*-Weighted Brain MRI.
In: (Simulation and Synthesis in Medical Imaging). Berlin [u.a.]: Springer, 2023. 42-52 (Lect. Notes Comput. Sc. ; 14288)
In this work, we propose a realistic, physics-aware motion simulation procedure for T-2*-weighted magnetic resonance imaging (MRI) to improve learning-based motion correction. As T-2*-weighted MRI is highly sensitive to motion-related changes in magnetic field inhomogeneities, it is of utmost importance to include physics information in the simulation. Additionally, current motion simulations often only assume simplified motion patterns. Our simulations, on the other hand, include real recorded subject motion and realistic effects of motioninduced magnetic field inhomogeneity changes. We demonstrate the use of such simulated data by training a convolutional neural network to detect the presence of motion in affected k-space lines. The network accurately detects motion-affected k-space lines for simulated displacements down to >= 0.5mm (accuracy on test set: 92.5%). Finally, our results demonstrate exciting opportunities of simulation-based k-space line detection combined with more powerful reconstruction methods. Our code is publicly available at: https://github.com/HannahEichhorn/ T2starLineDet.
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Publication type
Article: Conference contribution
Keywords
Brain MRI; Motion Artefacts; Motion Detection; Motion Correction; Deep Learning
ISSN (print) / ISBN
0302-9743
e-ISSN
1611-3349
Conference Title
Simulation and Synthesis in Medical Imaging
Quellenangaben
Volume: 14288,
Pages: 42-52
Publisher
Springer
Publishing Place
Berlin [u.a.]
Non-patent literature
Publications
Institute(s)
Institute for Machine Learning in Biomed Imaging (IML)
Grants
Helmholtz Association under the joint research school "Munich School for Data Science -MUDS"