Publications by authors named "Juan D Baena"
Purpose: Radiofrequency field inhomogeneity is a significant issue in imaging large fields of view in high- and ultrahigh-field MRI. Passive shimming with coupled coils or dielectric pads is the most common approach at 3 T. We introduce and test light and compact metasurface, providing the same homogeneity improvement in clinical abdominal imaging at 3 T as a conventional dielectric pad.
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- 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.