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Abstract #3984

Non-regularized Dipole Inversion with streaking suppression via L1-norm optimization

Mathias Gabriel Lambert1,2,3, Cristian Tejos1,2,3, and Carlos Milovic4
1Department of Electrical Engineering, Pontificia Universidad Católica de Chile, Santiago, Chile, 2Biomedical Imaging Center, Pontificia Universidad Católica de Chile, Santiago, Chile, 3Millennium Nucleus for Cardiovascular Magnetic Resonance, Santiago, Chile, 4Department of Medical Physics and Biomedical Engineering, University College London, London, United Kingdom

Non-regularized QSM reconstructions are feasible by stopping gradient descent methods before they diverge. These methods consume less computation time, while avoiding the time required for parameter selection. In this work we present a linear dipole inversion method without regularization that uses the L1-norm in a proximal step to prevent streaking propagation and present more robustness against phase outliers. Compared to the Nonlinear Dipole Inversion method, our implementation achieved lower RMSE scores in phantom experiments and in vivo reconstructions with fewer artifacts.

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