Axial Field of View Expansion by Switchable Halbach Dipole Rings: A Simulation Study
In Magnetic particle imaging (MPI), the spatial encoding of the particle response is achieved by a magnetic gradient field called selection field. In this work a selection field generator based on two pairs of nested and freely rotatable Halbach cylinders in dipole configuration generating a gradien...
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| Format: | Article |
| Language: | English |
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De Gruyter
2024-12-01
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| Series: | Current Directions in Biomedical Engineering |
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| Online Access: | https://doi.org/10.1515/cdbme-2024-2019 |
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| author | Berghausen Katharina Aderhold Eric Graeser Matthias |
| author_facet | Berghausen Katharina Aderhold Eric Graeser Matthias |
| author_sort | Berghausen Katharina |
| collection | DOAJ |
| description | In Magnetic particle imaging (MPI), the spatial encoding of the particle response is achieved by a magnetic gradient field called selection field. In this work a selection field generator based on two pairs of nested and freely rotatable Halbach cylinders in dipole configuration generating a gradient field in form of a linear field free region (FFR) is proposed. Through adequate rotation of the Halbach dipoles the FFR can be moved continuously along the cylinder axis. To understand and evaluate the movement of the FFR for different sequences of dipole rotations a simulation study is conducted. The simulation is based on the approximation of a permanent magnet’s field as a magnetic dipole field, so that the Halbach cylinder field results from the superposition of circularly arranged magnetic dipole moments. By the summation of four Halbach dipole fields the selection field can be calculated. It has turned out that the opposite rotation and the matching field strengths of the dipoles of a pair are prerequisites for the movement of the FFR. With regard to the gradient field strengths and the movement speed of the FFR within a potential imaging area, a phase-shifted rotation of two pairs seems promising for the use in MPI. |
| format | Article |
| id | doaj-art-af737e38182c4b9c8148a8430dbb67b5 |
| institution | Kabale University |
| issn | 2364-5504 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Current Directions in Biomedical Engineering |
| spelling | doaj-art-af737e38182c4b9c8148a8430dbb67b52025-01-02T05:56:32ZengDe GruyterCurrent Directions in Biomedical Engineering2364-55042024-12-01104798210.1515/cdbme-2024-2019Axial Field of View Expansion by Switchable Halbach Dipole Rings: A Simulation StudyBerghausen Katharina0Aderhold Eric1Graeser Matthias2Fraunhofer IMTE, Fraunhofer Research Institution for Individualized and Cell-Based Medical Engineering, Moenkhofer Weg 239a,Luebeck, GermanyFraunhofer IMTE, Fraunhofer Research Institution for Individualized and Cell-Based Medical Engineering and Institute of Medical Engineering, University of Luebeck,Luebeck, GermanyFraunhofer IMTE, Fraunhofer Research Institution for Individualized and Cell-Based Medical Engineering and Institute of Medical Engineering, University of Luebeck,Luebeck, GermanyIn Magnetic particle imaging (MPI), the spatial encoding of the particle response is achieved by a magnetic gradient field called selection field. In this work a selection field generator based on two pairs of nested and freely rotatable Halbach cylinders in dipole configuration generating a gradient field in form of a linear field free region (FFR) is proposed. Through adequate rotation of the Halbach dipoles the FFR can be moved continuously along the cylinder axis. To understand and evaluate the movement of the FFR for different sequences of dipole rotations a simulation study is conducted. The simulation is based on the approximation of a permanent magnet’s field as a magnetic dipole field, so that the Halbach cylinder field results from the superposition of circularly arranged magnetic dipole moments. By the summation of four Halbach dipole fields the selection field can be calculated. It has turned out that the opposite rotation and the matching field strengths of the dipoles of a pair are prerequisites for the movement of the FFR. With regard to the gradient field strengths and the movement speed of the FFR within a potential imaging area, a phase-shifted rotation of two pairs seems promising for the use in MPI.https://doi.org/10.1515/cdbme-2024-2019magnetic particle imagingmedical imagingsimulationmagnetic field generator |
| spellingShingle | Berghausen Katharina Aderhold Eric Graeser Matthias Axial Field of View Expansion by Switchable Halbach Dipole Rings: A Simulation Study Current Directions in Biomedical Engineering magnetic particle imaging medical imaging simulation magnetic field generator |
| title | Axial Field of View Expansion by Switchable Halbach Dipole Rings: A Simulation Study |
| title_full | Axial Field of View Expansion by Switchable Halbach Dipole Rings: A Simulation Study |
| title_fullStr | Axial Field of View Expansion by Switchable Halbach Dipole Rings: A Simulation Study |
| title_full_unstemmed | Axial Field of View Expansion by Switchable Halbach Dipole Rings: A Simulation Study |
| title_short | Axial Field of View Expansion by Switchable Halbach Dipole Rings: A Simulation Study |
| title_sort | axial field of view expansion by switchable halbach dipole rings a simulation study |
| topic | magnetic particle imaging medical imaging simulation magnetic field generator |
| url | https://doi.org/10.1515/cdbme-2024-2019 |
| work_keys_str_mv | AT berghausenkatharina axialfieldofviewexpansionbyswitchablehalbachdipoleringsasimulationstudy AT aderholderic axialfieldofviewexpansionbyswitchablehalbachdipoleringsasimulationstudy AT graesermatthias axialfieldofviewexpansionbyswitchablehalbachdipoleringsasimulationstudy |