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Title
Multi-turn multi-gap transmission line resonators - Concept, design and first implementation at 4.7 T and 7 T
AuthorFrass-Kriegl, Roberta ; Laistler, Elmar ; Hosseinnezhadian, Sajad ; Schmid, Albrecht Ingo ; Moser, Ewald ; Poirier-Quinot, Marie ; Darrasse, Luc ; Ginefri, Jean-Christophe
Published in
Journal of Magnetic Resonance, San Diego, 2016, Vol. 273, page 65-72
PublishedSan Diego : Elsevier, 2016
LanguageEnglish
Document typeJournal Article
Keywords (EN)rf coil / surface coil / transmission line resonator / em simulation / b-1 mapping / high-field mri / mri / arrays / probe
Project-/ReportnumberI 1371-B24
ISSN1090-7807
URNurn:nbn:at:at-ubmuw:3-1734 Persistent Identifier (URN)
DOI10.1016/j.jmr.2016.10.008 
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Multi-turn multi-gap transmission line resonators - Concept, design and first implementation at 4.7 T and 7 T [2.38 mb]
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Abstract (English)

A novel design scheme for monolithic transmission line resonators (TLRs) is presented - the multi-turn multi-gap TLR (MTMG-TLR) design. The MTMG-TLR design enables the construction of TLRs with multiple turns and multiple gaps. This presents an additional degree of freedom in tuning self-resonant TLRs, as their resonance frequency is fully determined by the coil geometry (e.g. diameter, number of turns, conductor width, etc.). The novel design is evaluated at 4.7 T and 7 T by simulations and experiments, where it is demonstrated that MTMG-TLRs can be used for MRI, and that the B1 distribution of MTMG-TLRs strongly depends on the number and distribution of turns. A comparison to conventional loop coils revealed that the B1 performance of MTMG-TLRs is comparable to a loop coil with the same mean diameter; however, lower 10g SAR values were found for MTMG-TLRs. The MTMG-TLR design is expected to bring most benefits at high static field, where it allows for independent size and frequency selection, which cannot be achieved with standard TLR design. However, it also enables more accurate geometric optimization at low static field. Thereby, the MTMG-TLR design preserves the intrinsic advantages of TLRs, i.e. mechanical flexibility, high SAR efficiency, mass production, and coil miniaturization. (C) 2016 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license.

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CC-BY-License (4.0)Creative Commons Attribution 4.0 International License