L0-norm-Based Passive Shimming for Co-optimizing Magnetic Field Uniformity and Spherical Harmonic Characteristics
Motivation: Passive shimming (PS) involves an iterative procedure with low efficiency and accuracy. Goal(s): Enhance PS efficacy by incorporating dual harmonic-field constraints while reducing shim tray adjustments. Approach: An L0-norm approach co-optimizes field harmonics and shim tray usage, enhancing shimming efficacy. Results: Validated on a 7 T magnet, the technique improved field homogeneity from 85.36 ppm to 5.25 ppm, kept high-order harmonics below 2 ppm, and reduced shim tray adjustments by over 60%. Impact: The new method optimizes field uniformity and harmonics in each iteration with minimized shim operations, offering a novel PS design applicable to various MRI magnet systems.
Authors
- Wenchen Wang (ORCID: https://orcid.org/0000-0002-4221-9612)
- Ewald Weber (ORCID: https://orcid.org/0000-0002-7323-8015)
- Riyu Wei
- Yaohui Wang (ORCID: https://orcid.org/0000-0001-6434-5356)
- Feng Liu (ORCID: https://orcid.org/0009-0005-7300-3768)
Publication Details
- Journal
- Proceedings on CD-ROM - International Society for Magnetic Resonance in Medicine. Scientific Meeting and Exhibition/Proceedings of the International Society for Magnetic Resonance in Medicine, Scientific Meeting and Exhibition
- Published
- 2025-09-16
- DOI
- https://doi.org/10.58530/2025/3483
- Primary Topic
- Magnetic Bearings and Levitation Dynamics
- Type
- article
- Field-Weighted Citation Impact
- 0.00