Microstructured Magnetic Materials for RF Flux Guides in Magnetic Resonance Imaging
Top Cited Papers
- 2 February 2001
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 291 (5505) , 849-851
- https://doi.org/10.1126/science.291.5505.849
Abstract
Magnetic resonance imaging and spectroscopy systems use coils, either singly or as arrays, to intercept radio-frequency (RF) magnetic flux from regions of interest, often deep within the body. Here, we show that a new magnetic material offers novel possibilities for guiding RF flux to the receiver coil, permitting a clear image to be obtained where none might otherwise be detectable. The new material contains microstructure designed according to concepts taken from the field of photonic band gap materials. In the RF range, it has a magnetic permeability that can be produced to specification while exhibiting negligible direct-current magnetism. The latter property is vital to avoid perturbing the static and audio-frequency magnetic fields needed to obtain image and spectral data. The concept offers a new paradigm for the manipulation of RF flux in all nuclear magnetic resonance systems.Keywords
This publication has 15 references indexed in Scilit:
- Composite Medium with Simultaneously Negative Permeability and PermittivityPhysical Review Letters, 2000
- Magnetism from conductors and enhanced nonlinear phenomenaIEEE Transactions on Microwave Theory and Techniques, 1999
- High-impedance electromagnetic surfaces with a forbidden frequency bandIEEE Transactions on Microwave Theory and Techniques, 1999
- Low frequency plasmons in thin-wire structuresJournal of Physics: Condensed Matter, 1998
- Photonic band structure: The face-centered-cubic case employing nonspherical atomsPhysical Review Letters, 1991
- Existence of a photonic gap in periodic dielectric structuresPhysical Review Letters, 1990
- Instability and Deformation of a Spherical Vesicle by PressurePhysical Review Letters, 1987
- The sensitivity of the zeugmatographic experiment involving human samplesJournal of Magnetic Resonance (1969), 1979
- The signal-to-noise ratio of the nuclear magnetic resonance experimentJournal of Magnetic Resonance (1969), 1976
- THE ELECTRODYNAMICS OF SUBSTANCES WITH SIMULTANEOUSLY NEGATIVE VALUES OF $\epsilon$ AND μSoviet Physics Uspekhi, 1968