ArticleIEEE transactions on bio-medical engineering2015
A novel method to decrease electric field and SAR using an external high dielectric sleeve at 3 T head MRI: numerical and experimental results.
Article in IEEE transactions on bio-medical engineering, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed.
- Assessment of radio-frequency heating of a parallel transmit coil in a phantom using multi-echo proton resonance frequency shift thermometry.Magnetic resonance imaging · 2021Article
- Sensitivity and uniformity improvement of phased array MR images using inductive coupling and RF detuning circuits.Magma (New York, N.Y.) · 2020Article
- Improvement ofMagma (New York, N.Y.) · 2019Article
- Improvement of Electromagnetic Field Distributions Using High Dielectric Constant (HDC) Materials for CTL-Spine MRI: Numerical Simulations and Experiments.IEEE transactions on electromagnetic compatibility · 2017Article
- RF Safety Evaluation of a Breast Tissue Expander Device for MRI: Numerical Simulation and Experiment.IEEE transactions on electromagnetic compatibility · 2017Article
Corrections and comments
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Authors and funding
4 authors.
Funding
Abstract
Materials with high dielectric constant (HDC) have been used in high field MRI to decrease specific absorption rate (SAR), increase magnetic field intensity, and increase signal-to-noise ratio. In previous studies, the HDC materials were placed inside the RF coil decreasing the space available. This study describes an alternative approach that considers an HDC-based sleeve placed outside the RF coil. The effects of an HDC on the electromagnetic (EM) field were studied using numerical simulations with a coil unloaded and loaded with a human head model. In addition, experimental EM measurements at 128 MHz were performed inside a custom-made head coil, fitted with a distilled water sleeve. The numerical simulations showed up to 40% decrease in maximum 10 g-avg. SAR on the surface of the head model with an HDC material of barium titanate. Experimental measurements also showed up to 20% decrease of maximum electric field using an HDC material of distilled water. The proposed method can be incorporated in the design of high field transmit RF coils.
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