Magnets and Shims
Digital Poster
Physics & Engineering
Tuesday, 12 May 2026
New and improved designs for superconducting and permanent magnets
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466-04-001.
Shimmer: Passive, Open-Source B0 Shimming Procedure for Low-Field MRI Magnets
Impact: Shimmer allows one to effectively improve the field
homogeneity of permanent low-field magnet arrays to reach values needed for
undistorted MR imaging. Shimmer is open-source and facilitates dissemination of
MR technology.
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466-04-002.
Thermal Ferromagnetic Shims for Compact Magnets
Impact: This work introduces
a new type of B0 shimming that enables high order shim sets that fit
in a very small space and dissipate less power than conventional resistive
shims.
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466-04-003.
Dynamic higher-order shims for a unipolar head gradient
Impact: This study shows that dynamic
higher-order shimming can be achieved in concert with unipolar head gradients
at high field. This is important to cutting-edge neuroimaging, which calls for
enhanced field control to complement sensitivity, speed, and the avoidance of
ambiguity.
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466-04-004.
Evaluating Field Map Reproducibility Utilizing an Open Source, Vendor Independent B0 Shimming Tool
Impact: Our proposed shimming procedure is an open-source tool that runs on scanners of multiple vendors, and increases field map reproducibility across multiple scanning sessions.
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466-04-005.
Shim Control: a software for brain B₀ shimming at ultra-high field
Impact: Shim Control enables fast, efficient and robust B₀ shimming at ultra-high fields, improving magnetic field homogeneity compared to vendor tools and providing a practical solution for routine human, NHP and phantom MRI acquisitions.
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466-04-006.
Shimming of breathing-induced B0 changes in the spinal cord with an integrated RF/shim coil array and ultrasound-based sensor
Impact: Ultrasound-based OCM sensors can be used to derive depth-dependent
tissue displacements to characterize internal respiratory motion and perform
real-time shimming of breathing-induced B0 changes, substantially
reducing image artifacts and enabling more accurate diffusion and functional
MRI of the spinal cord.
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466-04-007.
Improving MRI of in vivo subjects through 3D-printed passive shims
Impact: Through an automated, low-cost 3D-printing workflow, customized passive
shims significantly improve B0 uniformity and image quality,
enabling scalable, individualized shimming strategies for preclinical and
translational MRI, and effectively correcting complex field distortions beyond
the capabilities of conventional methods.
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466-04-008.
Permanent magnet arrays – understanding and addressing discrepancies between designed and measured magnetic field
Impact: This comprehensive study improves MRI technology in terms of design and manufacturing by addressing magnetic field imperfections in permanent magnet arrays, fostering advancements in magnet and shim development. It paves the way to improved imaging precision for portable MRI scanners.
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466-04-009.
Characterization of reconfigurable permanent magnet arrays for low-field MRI applications
Impact: This work provides the foundation for developing low-cost, portable, single-user low-field MRI systems. The reconfigurable magnet array design allows easier patient positioning and improves the ability to image specific anatomical regions depending on the configuration of the array.
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466-04-010.
B0 Homogeneity Improvement at 7T Utilising Polypropylene Pellets
Impact: B0
inhomogeneity image artefacts caused by air-tissue interfaces present a
considerable challenge when imaging at UHF (7T). We report the first quantification
of the effect of the low-cost, practical solution of polypropylene-pellet surrounds
on B0 homogeneity and image artefact suppression.
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466-04-011.
Using pyrolytic graphite foam to improve the shim of a neonatal head
Impact: We demonstrate that a pyrolytic graphite foam can reduce magnetic field inhomogeneities in the neonatal brain at ultra-high field. This is expected to improve robustness and quality of BOLD fMRI, particularly in the occipital lobe, where distortions are most pronounced.
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466-04-012.
3D-Printing for Cost-Effective Production of Low-Field Halbach Magnet Arrays
Impact: This study shows that 3D-printed Halbach magnet arrays perform comparably to CNC-milled ones, lowering low-field magnet production costs and complexity. The 3D-printed approach reduced overall MRI system cost by approximately 40% compared to the traditional manufacturing method.
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466-04-013.
OmniShim - a vendor-independent B0 Shimming software toolbox
Impact: OmniShim Toolbox, a software package designed to
calibrate and perform B0 shimming in user-defined regions of
interest across human MRI scanners from different vendors, supporting various
shim orders.
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466-04-014.
Optimization of Keystone geometry winding patterns for short superconducting MRI magnets
Impact: We demonstrate the potential for an improved patient experience by utilizing a non-traditional keystone cross-section magnet geometry. We identify configurations with significantly lower conductor cost growth as the bore is shortened compared to conventional solenoid designs.
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466-04-015.
Permanent Magnet Design via Combination of Genetic Algorithm and 3D Finite Element Method
Impact: We proposed a framework, integrating genetic
algorithm and 3D finite element method, to optimize the mechanical structure of
permanent magnet for low-field and ultra-low field MRI with relatively fast
speed and acceptable accuracy, enabling automated computer-aided design.
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466-04-016.
Simulation-Guided DC Coil Design for B0 Shimming in Proximity to an RF Receive Array
Impact: This
work presents design strategies for independent DC coils and their
characterizations on the impact of RF coil performance, paving the way for creating
a B0 shim array proximal to the RF receive array.
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