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A new 3D model for Magnetic Particle Imaging using realistic magnetic field topologies for algebraic reconstruction

  • We derive a new 3D model for magnetic particle imaging (MPI) that is able to incorporate realistic magnetic fields in the reconstruction process. In real MPI scanners, the generated magnetic fields have distortions that lead to deformed magnetic low-field volumes with the shapes of ellipsoids or bananas instead of ideal field-free points (FFP) or lines (FFL), respectively. Most of the common model-based reconstruction schemes in MPI use however the idealized assumption of an ideal FFP or FFL topology and, thus, generate artifacts in the reconstruction. Our model-based approach is able to deal with these distortions and can generally be applied to dynamic magnetic fields that are approximately parallel to their velocity field. We show how this new 3D model can be discretized and inverted algebraically in order to recover the magnetic particle concentration. To model and describe the magnetic fields, we use decompositions of the fields in spherical harmonics. We complement the description of the new model with several simulations and experiments, exploring the effects of magnetic fields distortion and reconstruction parameters on the reconstruction.

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Metadaten
Author:Gaël BringoutORCiD, Wolfgang ErbORCiD, Jürgen FrikelORCiD
DOI:https://doi.org/10.1088/1361-6420/abb446
Parent Title (English):Inverse Problems
Publisher:IOP Publishing
Document Type:Article
Language:English
Year of first Publication:2020
Release Date:2022/01/15
Volume:36
Issue:12
Article Number:124002
Institutes:Fakultät Informatik und Mathematik
Begutachtungsstatus:peer-reviewed
research focus:Energie und Mobilität
Produktion und Systeme
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG