A practical realization of an artificial magnetic shield for preclinical birdcage RF coils

K. Lezhennikova; A. Hurshkainen; C. Simovski; R. Abdeddaim; S. Enoch; A. Raaijmakers; I. Melchakova; S. Glybovski

doi:10.1088/1742-6596/1461/1/012085

A practical realization of an artificial magnetic shield for preclinical birdcage RF coils

K. Lezhennikova, A. Hurshkainen, C. Simovski, R. Abdeddaim, S. Enoch, A. Raaijmakers, I. Melchakova, S. Glybovski

Computational Imaging

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Abstract

In the most of magnetic resonance imaging (MRI) systems, a conventional radiofrequency (RF) electric shield is typically placed around an RF volume coil to avoid the interaction with the other components of the system. Disadvantageously metal shields reduce the transmit efficiency of the RF coil as well as its receive sensitivity due to out-ofphase reflection of electromagnetic waves. In contrast, an ideal magnetic shield having high surface impedance provides in-phase reflection, which can be promising for improvement of RF coil's performance. In this work, we propose an artificial magnetic shield based on a cylindrical miniaturized corrugated structure to improve characteristics of a small-animal birdcage coil at 7T. The coil was simulated in the presence of the metal and ideal magnetic shield as well as the proposed structure. The results demonstrate enhancement of the coil's performance in the presence of the proposed shield, which is comparable with an ideal one.

Original language	English
Pages	1-4
DOIs	https://doi.org/10.1088/1742-6596/1461/1/012085
Publication status	Published - 23 Apr 2020
Event	4th International Conference on Metamaterials and Nanophotonics, METANANO 2019 - St. Petersburg, Russian Federation Duration: 15 Jul 2019 → 19 Jul 2019

Conference

Conference	4th International Conference on Metamaterials and Nanophotonics, METANANO 2019
Country/Territory	Russian Federation
City	St. Petersburg
Period	15/07/19 → 19/07/19

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10.1088/1742-6596/1461/1/012085

Lezhennikova_2020_J._Phys.__Conf._Ser._1461_012085Final published version, 1.24 MB

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Lezhennikova, K., Hurshkainen, A., Simovski, C., Abdeddaim, R., Enoch, S., Raaijmakers, A., Melchakova, I., & Glybovski, S. (2020). A practical realization of an artificial magnetic shield for preclinical birdcage RF coils. 1-4. Paper presented at 4th International Conference on Metamaterials and Nanophotonics, METANANO 2019, St. Petersburg, Russian Federation. https://doi.org/10.1088/1742-6596/1461/1/012085

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abstract = "In the most of magnetic resonance imaging (MRI) systems, a conventional radiofrequency (RF) electric shield is typically placed around an RF volume coil to avoid the interaction with the other components of the system. Disadvantageously metal shields reduce the transmit efficiency of the RF coil as well as its receive sensitivity due to out-ofphase reflection of electromagnetic waves. In contrast, an ideal magnetic shield having high surface impedance provides in-phase reflection, which can be promising for improvement of RF coil's performance. In this work, we propose an artificial magnetic shield based on a cylindrical miniaturized corrugated structure to improve characteristics of a small-animal birdcage coil at 7T. The coil was simulated in the presence of the metal and ideal magnetic shield as well as the proposed structure. The results demonstrate enhancement of the coil's performance in the presence of the proposed shield, which is comparable with an ideal one.",

author = "K. Lezhennikova and A. Hurshkainen and C. Simovski and R. Abdeddaim and S. Enoch and A. Raaijmakers and I. Melchakova and S. Glybovski",

note = "Funding Information: This work was supported by the Russian Science Foundation (Project No. 18-19-00482). Publisher Copyright: {\textcopyright} 2020 IOP Publishing Ltd. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.; 4th International Conference on Metamaterials and Nanophotonics, METANANO 2019 ; Conference date: 15-07-2019 Through 19-07-2019",

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Lezhennikova, K, Hurshkainen, A, Simovski, C, Abdeddaim, R, Enoch, S, Raaijmakers, A, Melchakova, I & Glybovski, S 2020, 'A practical realization of an artificial magnetic shield for preclinical birdcage RF coils', Paper presented at 4th International Conference on Metamaterials and Nanophotonics, METANANO 2019, St. Petersburg, Russian Federation, 15/07/19 - 19/07/19 pp. 1-4. https://doi.org/10.1088/1742-6596/1461/1/012085

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AU - Lezhennikova, K.

AU - Hurshkainen, A.

AU - Simovski, C.

AU - Abdeddaim, R.

AU - Enoch, S.

AU - Raaijmakers, A.

AU - Melchakova, I.

AU - Glybovski, S.

N1 - Funding Information: This work was supported by the Russian Science Foundation (Project No. 18-19-00482). Publisher Copyright: © 2020 IOP Publishing Ltd. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/4/23

Y1 - 2020/4/23

N2 - In the most of magnetic resonance imaging (MRI) systems, a conventional radiofrequency (RF) electric shield is typically placed around an RF volume coil to avoid the interaction with the other components of the system. Disadvantageously metal shields reduce the transmit efficiency of the RF coil as well as its receive sensitivity due to out-ofphase reflection of electromagnetic waves. In contrast, an ideal magnetic shield having high surface impedance provides in-phase reflection, which can be promising for improvement of RF coil's performance. In this work, we propose an artificial magnetic shield based on a cylindrical miniaturized corrugated structure to improve characteristics of a small-animal birdcage coil at 7T. The coil was simulated in the presence of the metal and ideal magnetic shield as well as the proposed structure. The results demonstrate enhancement of the coil's performance in the presence of the proposed shield, which is comparable with an ideal one.

AB - In the most of magnetic resonance imaging (MRI) systems, a conventional radiofrequency (RF) electric shield is typically placed around an RF volume coil to avoid the interaction with the other components of the system. Disadvantageously metal shields reduce the transmit efficiency of the RF coil as well as its receive sensitivity due to out-ofphase reflection of electromagnetic waves. In contrast, an ideal magnetic shield having high surface impedance provides in-phase reflection, which can be promising for improvement of RF coil's performance. In this work, we propose an artificial magnetic shield based on a cylindrical miniaturized corrugated structure to improve characteristics of a small-animal birdcage coil at 7T. The coil was simulated in the presence of the metal and ideal magnetic shield as well as the proposed structure. The results demonstrate enhancement of the coil's performance in the presence of the proposed shield, which is comparable with an ideal one.

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A practical realization of an artificial magnetic shield for preclinical birdcage RF coils

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