ArticleMagnetic resonance in medicine2021
Improved whole-brain SNR with an integrated high-permittivity material in a head array at 7T.
Article in Magnetic resonance in medicine, 2021. 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
- 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
- In vivoMagnetic resonance in medicine · 2024Article
- A theoretical framework to investigate the effect of high permittivity materials in MRI using anatomy-mimicking cylinders.Magnetic resonance in medicine · 2024Article
- 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
- High-permittivity pads to enhance SNR and transmit efficiency in MRI of the heart at 7T: a simulation study.Magma (New York, N.Y.) · 2022Article
- Novel materials in magnetic resonance imaging: high permittivity ceramics, metamaterials, metasurfaces and artificial dielectrics.Magma (New York, N.Y.) · 2022Review
- A Physical Framework to Interpret the Effects of High Permittivity Materials on Radiofrequency Coil Performance in Magnetic Resonance Imaging.IEEE transactions on bio-medical engineering · 2022Article
- 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
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Authors and funding
8 authors.
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Abstract
purposeTo demonstrate that strategic use of materials with high electric permittivity along with integrated head-sized coil arrays can improve SNR in the entire brain.
methodsNumerical simulations were used to design a high-permittivity material (HPM) helmet for enhancing SNR throughout the brain in receive arrays of 8 and 28 channels. Then, two 30-channel head coils of identical geometry were constructed: one fitted with a prototype helmet-shaped ceramic HPM helmet, and the second with a helmet-shaped low-permittivity shell, each 8-mm thick. An eight-channel dipole array was used for excitation. In vivo maps of excitation flip angle and SNR were acquired.
resultsSimulation results showed improvement in transmit efficiency by up to 65% and in receive-side SNR by up to 47% on average through the head with use of an HPM helmet. Experimental results showed that experimental transmit efficiency was improved by approximately 56% at the center of brain, and experimental receive-side SNR (SNR normalized to flip angle) was improved by approximately 21% on average through orthogonal planes through the cerebrum, including at the center of the brain, with the HPM.
conclusionAlthough HPM is used increasingly to improve transmit efficiency locally in situations in which the transmit coil and imaging volume are much larger than the HPM, here we demonstrate that HPM can also be used to improve transmit efficiency and receive-side SNR throughout the brain by improving performance of a head-sized receive array. This includes the center of the brain, where it is difficult to improve SNR by other means.
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