Impact of eddy currents and mechanical oscillations on B0 mapping at 7T
Motivation: Eddy currents and field oscillations due to mechanical resonances are known to adversely impact image quality at ultra-high field. These have already been shown to distort applied field gradients. Goal(s): To investigate spatially-constant zero-order field oscillations and their impact on phase-based measurements including B0 mapping. Approach: Measure phase oscillations on two different 7T MR systems and perform B0 mapping using different gradient orientations and echo spacings to assess bias. Results: Similar oscillatory phase behaviour was observed at both 7T sites. Biases in B0 mapping are introduced that depend on sequence parameter choice, most notably readout direction. Impact: Phase oscillations relating to a mechanical resonance lead to variable phase measured in gradient echo scans consistently at two sites. This leads to biases in B0 mapping that depend on the choice of echo spacing and readout axis.
Authors
- Daniel W. D. West (ORCID: https://orcid.org/0000-0001-9195-2602)
- Sharon Giles (ORCID: https://orcid.org/0000-0002-8528-3745)
- Shaihan Malik (ORCID: https://orcid.org/0000-0001-8925-9032)
- Oliver Josephs
- Sarah McElroy (ORCID: https://orcid.org/0000-0002-4271-5931)
- Tomoki Arichi (ORCID: https://orcid.org/0000-0002-3550-1644)
- Martina F. Callaghan (ORCID: https://orcid.org/0000-0003-0374-1659)
- Barbara Dymerska (ORCID: https://orcid.org/0000-0001-6339-2169)
- Philippa Bridgen (ORCID: https://orcid.org/0009-0008-8051-8139)
- Tobias Wood (ORCID: https://orcid.org/0000-0001-7640-5520)
- Joseph V. Hajnal (ORCID: https://orcid.org/0000-0002-2690-5495)
- David Leitão (ORCID: https://orcid.org/0000-0001-5853-8602)
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/10.58530/2025/3485
- Primary Topic
- Nuclear Physics and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00