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Wireless coils based on resonant and nonresonant coupled-wire structure for small animal multinuclear imaging [in press]

Vergara Gomez, T. S.; Dubois, M.; Glybovski, S.; Larrat, B.; Rosny, J. de; Rockstuhl, C.; Bernard, M.; Abdeddaim, R.; Enoch, S.; Kober, F.

Abstract:
Earlier work on RF metasurfaces for preclinical MRI has targeted applications such as whole‐body imaging and dual‐frequency coils. In these studies, a nonresonant loop was used to induce currents into a metasurface that was operated as a passive inductively powered resonator. However, as we show in this study, the strategy of using a resonant metasurface reduces the impact of the loop on the global performance of the assembled coil. To mitigate this deficiency, we developed a new approach that relies on the combination of a commercial surface coil and a coupled‐wire structure operated away from its resonance. This strategy enables the extension of the sensitive volume of the surface coil while maintaining its local high sensitivity without any hardware modification. A wireless coil based on a two parallel coupled‐wire structure was designed and electromagnetic field simulations were carried out with different levels of matching and coupling between both components of the coil. For experimental characterization, a prototype was built and tested at two frequencies, 300 MHz for 1H and 282.6 MHz for 19F at 7 T. Phantom and in vivo MRI experiments were conducted in different configurations to study signal and noise figures of the structure. ... mehr

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Originalveröffentlichung
DOI: 10.1002/nbm.4079
Scopus
Zitationen: 1
Zugehörige Institution(en) am KIT Institut für Theoretische Festkörperphysik (TFP)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 0952-3480, 1099-1492
KITopen-ID: 1000092770
HGF-Programm 43.23.01 (POF III, LK 01)
Erschienen in NMR in biomedicine
Seiten e4079
Nachgewiesen in Scopus
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