Design of Distributed Spiral Resonators for the Decoupling of MRI Double-Tuned RF Coils

Journal article


Brizi, D, Fontana, N, Costa, F, Tiberi, G, Galante, A, Alecci, M and Monorchio, A (2020). Design of Distributed Spiral Resonators for the Decoupling of MRI Double-Tuned RF Coils. IEEE Transactions on Biomedical Engineering. 67 (10), pp. 2806-2816. https://doi.org/10.1109/TBME.2020.2971843
AuthorsBrizi, D, Fontana, N, Costa, F, Tiberi, G, Galante, A, Alecci, M and Monorchio, A
Abstract

© 1964-2012 IEEE. Objective: A systematic analytical approach to design Spiral Resonators (SRs), acting as distributed magnetic traps (DMTs), for the decoupling of concentric Double-Tuned (DT) RF coils suitable for Ultra-High Field (7 T) MRI is presented. Methods: The design is based on small planar SRs placed in between the two RF loops (used for signal detection of the two nuclei of interest). We developed a general framework based on a fully analytical approach to estimate the mutual coupling between the RF coils and to provide design guidelines for the geometry and number of SRs to be employed. Starting from the full-analytical estimations of the SRs geometry, electromagnetic simulations for improving and validating the performance can be carried out. Results and Conclusion: We applied the method to a test case of a DT RF coil consisting of two concentric and coplanar loops used for 7 T MRI, tuned at the Larmor frequencies of the proton (1H, 298 MHz) and sodium (23Na, 79 MHz) nuclei, respectively. We performed numerical simulations and experimental measurements on fabricated prototypes, which both demonstrated the effectiveness of the proposed design procedure. Significance: The decoupling is achieved by printing the SRs on the same dielectric substrate of the RF coils thus allowing a drastic simplification of the fabrication procedure. It is worth noting that there are no physical connections between the decoupling SRs and the 1H/23Na RF coils, thus providing a mechanically robust experimental set-up, and improving the transceiver design with respect to other traditional decoupling techniques.

Year2020
JournalIEEE Transactions on Biomedical Engineering
Journal citation67 (10), pp. 2806-2816
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
ISSN0018-9294
Digital Object Identifier (DOI)https://doi.org/10.1109/TBME.2020.2971843
Publication dates
Print01 Oct 2020
Online05 Feb 2020
Publication process dates
Deposited02 Feb 2021
Accepted author manuscript
License
File Access Level
Open
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https://openresearch.lsbu.ac.uk/item/8vw37

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File access level: Open

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