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Assessing Safety and Transceive Performance of a Body Coil Combined with a Volumetric Wireless Coil for Wrist MRI at 3 T

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Abstract

The concept of a volumetric wireless coil electromagnetically coupled to a body coil (BC) to improve the quality and radiofrequency (RF) safety of wrist MRI at 1.5 T was recently proposed and confirmed via in vivo studies. Here, we demonstrate, for the first time, that the same concept can be applied at 3 T, where the RF safety issue is more critical. Our work includes a detailed analysis of the wireless coil robustness to the possible breakages of coil elements and its imperfect positioning inside the BC. The wireless coil design is based on a periodic array of coupled split-loop resonators. The cases of wireless coil breakage and inaccurate positioning were considered in terms of influence on RF safety via electromagnetic simulations with a human voxel model. In vivo experiments were also performed to evaluate the transmit efficiency and uniformity of the B1+-field. Numerical simulations demonstrated that the wireless coil provides a 4.1-fold increase in the local RF safety and almost a sevenfold increase in the global RF safety in comparison with the case of the same BC used alone. Minor breakages and positioning errors only slightly affect the transmit efficiency and the RF safety, confirming the wireless coil robustness. The wireless coil was shown to be feasible for wrist imaging at 3 T. A significant improvement of the RF safety may be useful in studies with implants and in the case when high-performance pulse sequences are required for improving the image quality.

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Acknowledgements

The part of the research devoted to the wireless coil design and experimental studies was supported by the Ministry of Education and Science of the Russian Federation (075-15-2021-592). The part of the work related to the RF safety assessment of the wireless coil was carried out with the support of a grant from the President of the Russian Federation for scientific school HШ-2359.2022.4.

Funding

Ministry of Education and Science of the Russian Federation (075-15-2021-592); Grant from the President of the Russian Federation for scientific school HШ-2359.2022.4.

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AN performed the simulations; PT built a prototype; EB and AN performed the experiments; AN drafted the manuscript; PT, AV and EB reviewed the manuscript.

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Correspondence to Aleksei Nasonov.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Nasonov, A., Tikhonov, P., Shchelokova, A. et al. Assessing Safety and Transceive Performance of a Body Coil Combined with a Volumetric Wireless Coil for Wrist MRI at 3 T. Appl Magn Reson 53, 1597–1607 (2022). https://doi.org/10.1007/s00723-022-01502-x

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  • DOI: https://doi.org/10.1007/s00723-022-01502-x

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