Digital Poster
Magnets & Shims
ISMRM & ISMRT Annual Meeting & Exhibition • 10-15 May 2025 • Honolulu, Hawai'i
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Computer Number: 129
3470. Feasibility
of multi-coil B0 shimming for correcting artifacts from metallic
orthodontic appliances in pediatric 3T brain imaging
J. Stockmann, D. Brightman, I. Govindarajan, J. Short, L.
Craven-Brightman, B. Bilgic, M. Ackerman, E. Grant, B.
Gagoski
Massachusetts General Hospital, Charlestown, United States
Impact: We explore the use of local B0 shim
coils to correct artifacts in brain MRI scans of pediatric
patients with metallic orthodontic appliances, enabling the
acquisition of high-quality images on these patients without
removing their braces or other hardware.
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Computer Number: 130
3471. Design
and Implementation of Novel Ear Shims to Enhance the Functional
MRI at 5T and beyond
Z. Liu, J. Stockmann, Z. Ren
ShanghaiTech University, Shanghai, China
Impact: The novel earplug enhances B0 homogeneity
in the temporal lobe region, greatly improving the image
quality of fMRI and supporting neuroscience research related
to the temporal lobe region.
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Computer Number: 131
3472. Optimized
Cardiac B0 Shimming at 3T with Deep-Learning-Enabled
Motion-Adapted Shim
X. Li, Y. Huang, A. Malagi, X. Guan, Y. Shang, C-C Yang, L-T
Huang, Z. Long, J. Zepeda, X. Zhang, G. Yoosefian, X. Bi, C.
Gao, H-L Lee, D. Li, R. Dharmakumar, H. Han, H-J Yang
Cedars-Sinai Medical Center, Los Angeles, United States
Impact: This study develops a motion-adapted shimming
technique for reliable, operator-independent CMR shimming at
3T. This approach holds particular promise for patients with
compromised breath-hold capacity, providing the potential
for more consistent image quality and accurate clinical CMR
assessments.
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Computer Number: 132
3473. Weighted
and dynamic B0 shimming for interleaved MRI and MRS
acquisition at 7T using a multi-coil array
C. Lucas, S. Francis, A. Berrington
University of Nottingham, Nottingham, United Kingdom
Impact:
Weighted shimming improves homogeneity outside of small regions thus reducing artefacts for MRS. Dynamic shimming with the multi-coil shim array may allow for greater flexibility than updating spherical harmonics alone. This approach improves data quality using interleaved acquisition approaches. |
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Computer Number: 133
3474. Development
of an Automated Workflow for stream-function based B0 Shim Coil
Design and Experimental Integration with RF Coils at 7T
S. Su, B. Zhang, A. Henning
University of Texas Southwestern Medical Center, Dallas, United States
Impact: The automated workflow provides a feasible and
practical approach for B0 shim
coil design. Proposed brain shim coil will facilitate
imaging sequences limited by field inhomogeneities. Future
investigations could migrate to spine or heart shim coil
design with this workflow.
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Computer Number: 134
3475. Real-time
shimming of respiration-induced B0 fluctuations in the spinal
cord with an integrated RF/shim iPRES(3) coil array
E. Wong, D. Darnell, J. Stockmann, F. Robb, A. Song, T-K
Truong
Duke University, Durham, United States
Impact: Real-time shimming of the spinal cord with the
iPRES(3) coil array can effectively reduce both spatial and
temporal B0 variations
caused by breathing, which is expected to enable more
accurate diffusion and functional MRI of the spinal cord.
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Computer Number: 135
3476. An
initial imaging test of a portable 7 T cryogen-free MRI system
Y. Wang, W. Yang, S. Wei, S. Chen, H. Wang, J. Sun, W. Sun,
F. Liu, Q. Wang
Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, China
Impact: The ultrahigh-field, cryogen-free, portable,
high-resolution MRI system will be an economical tool for
researchers engaged in ultrahigh-field related studies. In
the future, advanced spectroscopic and imaging functions
will enable a broader range of scientific explorations.
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Computer Number: 136
3477. Anatomy-Based
Simulations of B0 Field Maps: A Large Database for Head and
Spine Shim Coil Development
M. Boudreau, C. Pageot, N. Molinier, N. Laines-Medina, S.
Rios, A. D'Astous, V. Callot, E. Alonso-Ortiz, J. Cohen-Adad
Polytechnique Montreal, Montreal, Canada
Impact: This open-access B0 map
database of diverse human anatomies enables more effective
shim coil design, improving MRI quality in challenging
regions like the spine. It addresses anatomical variation,
supporting advancements in ultra-high field MRI applications
and shimming research.
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Computer Number: 137
3478. Dynamic
shimming of low-order spherical harmonics using a shim coil
array in conjunction with a field camera.
R. Sobhan, L. Bortolotti, M-M Tavener, R. Bowtell
University of Nottingham, Nottingham, United Kingdom
Impact: The
combination of a field camera and separately controlled shim
array allows cancellation of time-varying fields up to high
order, largely independent of the scanner. This approach can
be used to improve the quality of high field images and
spectra.
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Computer Number: 138
3479. Open-Source,
Multi-Vendor B0 Shimming Protocol
J. Pothoof, N. Wehkamp, J. Fessler, M. Zaitsev, D. Noll, J-F
Nielsen
University of Michigan, Ann Arbor, United States
Impact: The proposed open-source B0 shimming protocol
runs on multiple vendors’ scanners, increasing the
harmonization of experimental workflows for multisite MRI
and fMRI studies.
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Computer Number: 139
3480. Universal
B0 shimming for whole-brain MRI at 7T
M. de Buck, N. Priovoulos, W. van der Zwaag
Netherlands Institute for Neuroscience, Royal Netherlands Academy for Arts and Sciences, Amsterdam, Netherlands
Impact: We propose an easy-to-use universal B0 shim
for 7T brain MRI with similar performance to
subject-specific shims. This can provide an improved initial
estimate for iterative shimming, a time-efficient solution
for ultrafast protocols, or a backup when subject-specific
shimming fails.
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Computer Number: 140
3481. Local
versus Global: Optimal Evolutionary Solvers for 3rd Order
Spherical-Harmonics B0-shimming at 7T .
M. Terekhov, I. Homolya, M. Gamer, G. Hein
University Hospital Würzburg, Comprehensive Heart Failure Center, Wuerzburg, Germany, Germany
Impact: Global optimization solvers based on
evolutionary algorithms may provide B0-shimming
results essentially superior to the vendor-integrated
solution on a 7T scanner with 3rd order
shims.
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Computer Number: 141
3482. Active
shimming of the lung for mitigation of bSSFP banding artifacts
at high fields
P. Panos, G. Bauman, O. Bieri
University of Basel, Allschwil, Switzerland
Impact:
This work shows the potential of dedicated active shimming methods of the lung to mitigate off-resonance related image artifacts for bSSFP-based structural and functional MRI of the lung at high fields. |
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Computer Number: 142
3483. L0-norm-Based
Passive Shimming for Co-optimizing Magnetic Field Uniformity and
Spherical Harmonic Characteristics
W. Wang, Y. Wang, R. Wei, E. Weber, F. Liu
University of Queensland, Brisbane, Australia
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.
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Computer Number: 143
3484. Simulation
of B0 field conditions in the human prostate with existing hip
implant
H. Liang, C. Liu, M. Lu, X. Yan
Vanderbilt University Medical Center, Nashville, United States
Impact: This study provides insights into mitigating B0 field
distortions from hip implants, suggesting that solutions
like DC shim coils could be employed to counteract
susceptibility-induced artifacts in prostate MRI.
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Computer Number: 144
3485. Impact
of eddy currents and mechanical oscillations on B0 mapping at 7T
D. Leitão, D. West, S. McElroy, B. Dymerska, O. Josephs, M.
Callaghan, S. Giles, P. Bridgen, J. Hajnal, T. Arichi, T.
Wood, S. Malik
King's College London, London, United Kingdom
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.
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