A new quadrature annular resonator for 3 T MRI based on artificial-dielectrics
| Autor: | Alexey P. Slobozhanyuk, Andrew G. Webb, Ivan V. Sushkov, Anna Mikhailovskaya, Alena V. Shchelokova, Dmitry Dobrykh |
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| Rok vydání: | 2018 |
| Předmět: |
Permittivity
Nuclear and High Energy Physics Scanner Materials science Biophysics Physics::Optics Artificial-dielectrics 02 engineering and technology Dielectric High permittivity Biochemistry 030218 nuclear medicine & medical imaging Condensed Matter::Materials Science 03 medical and health sciences Resonator 0302 clinical medicine Optics High field MRI business.industry Metamaterial Dielectric resonator 021001 nanoscience & nanotechnology Condensed Matter Physics Dielectric resonators Electromagnetic coil Metamaterials 0210 nano-technology business Artificial dielectrics |
| Zdroj: | Journal of Magnetic Resonance, 291, 47-52. ACADEMIC PRESS INC ELSEVIER SCIENCE Journal of Magnetic Resonance Journal of Magnetic Resonance, 291, 47-52 |
| ISSN: | 1090-7807 |
| Popis: | Dielectric resonators have previously been constructed for ultra-high frequency magnetic resonance imaging and microscopy. However, it is challenging to design these dielectric resonators at clinical field strengths due to their intrinsically large dimensions, especially when using materials with moderate permittivity. Here we propose and characterize a novel approach using artificial-dielectrics which reduces substantially the required outer diameter of the resonator. For a resonator designed to operate in a 3 Tesla scanner using water as the dielectric, a reduction in outer diameter of 37% was achieved. When used in an inductively-coupled wireless mode, the sensitivity of the artificial-dielectric resonator was measured to be slightly higher than that of a standard dielectric resonator operating in its degenerate circularly-polarized hybrid electromagnetic modes (HEM11). This study demonstrates the first application of an artificial-dielectric approach to MR volume coil design. (c) 2018 Elsevier Inc. All rights reserved. |
| Databáze: | OpenAIRE |
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