AI Article Synopsis
- High-permittivity dielectric pads, made from ceramic powders and liquids, enhance magnetic fields in low-efficiency areas of transmit coils, improving image quality in MRI scans.
- These pads are subject to material degradation over time and contain some materials that may be incompatible with biological tissues.
- The article proposes a new solution using a cost-effective artificial dielectric slab made from printed-circuit board grids, which successfully achieves similar improvements in magnetic field distribution as traditional pads at 7 T.
Article Abstract
High-permittivity dielectric pads, i.e., thin, flexible slabs, usually consisting of mixed ceramic powders and liquids, have been previously shown to increase the magnetic field at high and ultra high-fields in regions of low efficiency of transmit coils, thus improving the homogeneity of images. However, their material parameters can change with time, and some materials they contain are bio incompatible. This article presents an alternative approach replacing ceramic mixtures with a low-cost and stable artificial dielectric slab. The latter comprises a stack of capacitive grids realized using multiple printed-circuit boards. Results in this article show that the proposed artificial dielectric structure can obtain the same increase in the local transmit radiofrequency magnetic field distribution in a head phantom at 7 T as the conventional dielectric pad.
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| http://dx.doi.org/10.1016/j.jmr.2020.106835 | DOI Listing |
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