ArticleMagnetic resonance in medicine2020
Toward whole-cortex enhancement with an ultrahigh dielectric constant helmet at 3T.
Article in Magnetic resonance in medicine, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed.
- Effect of an air layer on the design of high-permittivity material helmets for 7 T magnetic resonance imaging.Magma (New York, N.Y.) · 2026Article
- Improving Image Quality and Decreasing SAR With High Dielectric Constant Pads in 3 T Fetal MRI.Journal of magnetic resonance imaging : JMRI · 2025Article
- Large improvement in RF magnetic fields and imaging SNR with whole-head high-permittivity slurry helmet for human-brain MRI applications at 7 T.Magnetic resonance in medicine · 2025Article
- Article
- Multi-feed, loop-dipole combined dielectric resonator antenna arrays for human brain MRI at 7 T.Magma (New York, N.Y.) · 2023Article
- Repeatability of BMagnetic resonance in medicine · 2022Article
- Novel materials in magnetic resonance imaging: high permittivity ceramics, metamaterials, metasurfaces and artificial dielectrics.Magma (New York, N.Y.) · 2022Review
- Displacement current distribution on a high dielectric constant helmet and its effect on RF field at 10.5 T (447 MHz).Magnetic resonance in medicine · 2021Article
- Improved whole-brain SNR with an integrated high-permittivity material in a head array at 7T.Magnetic resonance in medicine · 2021Article
- Recommendations of Choice of Head Coil and Prescan Normalize Filter Depend on Region of Interest and Task.Frontiers in neuroscience · 2021Article
Corrections and comments
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Authors and funding
7 authors.
Funding
Abstract
purposeTo present a 3T brain imaging study using a conformal prototype helmet constructed with an ultra-high dielectric constant (uHDC; ε
methodsA helmet conformal to a standard human head constructed with uHDC materials was characterized through electromagnetic simulations and experimental work. The signal-to-noise ratio (SNR), transmit efficiency, and power deposition with the uHDC helmet inserted within a 20-channel head coil were measured in vivo and compared with a 64-channel head coil and the 20-channel coil without the helmet. Seven healthy volunteers were analyzed.
resultsSimulation and in vivo experimental results showed that transmit efficiency was improved by nearly 3 times within localized regions for a quadrature excitation, with a measured global increase of 58.21 ± 6.54% over 7 volunteers. The use of a parallel transmit spokes pulse compensated for severe degradation of
conclusionA prototype uHDC helmet enhanced the SNR of a standard head coil to the level of a high density 64-channel coil, although transmit homogeneity was compromised. Further improvements in SNR may be achievable with optimization of this technology, and could be a low-cost approach for future radiofrequency engineering work in the brain at 3T.
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