A nine-channel transmit/receive array for spine imaging at 10.5 T: Introduction to a nonuniform dielectric substrate antenna

Alireza Sadeghi-Tarakameh; Steve Jungst; Mike Lanagan; Lance DelaBarre; Xiaoping Wu; Gregor Adriany; Gregory J. Metzger; Pierre Francois Van de Moortele; Kamil Ugurbil; Ergin Atalar; Yigitcan Eryaman

doi:10.1002/mrm.29096

A nine-channel transmit/receive array for spine imaging at 10.5 T: Introduction to a nonuniform dielectric substrate antenna

Alireza Sadeghi-Tarakameh, Steve Jungst, Mike Lanagan, Lance DelaBarre, Xiaoping Wu, Gregor Adriany, Gregory J. Metzger, Pierre Francois Van de Moortele, Kamil Ugurbil, Ergin Atalar, Yigitcan Eryaman

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Abstract

PURPOSE: The purpose of this study is to introduce a new antenna element with improved transmit performance, named the nonuniform dielectric substrate (NODES) antenna, for building transmit arrays at ultrahigh-field.

METHODS: We optimized a dipole antenna at 10.5 Tesla by maximizing the B 1 + -SAR efficiency in a phantom for a human spine target. The optimization parameters included permittivity variation in the substrate, substrate thickness, antenna length, and conductor geometry. We conducted electromagnetic simulations as well as phantom experiments to compare the transmit/receive performance of the proposed NODES antenna design with existing coil elements from the literature.

RESULTS: Single NODES element showed up to 18% and 30% higher B 1 + -SAR efficiency than the fractionated dipole and loop elements, respectively. The new element is substantially shorter than a commonly used dipole, which enables z-stacked array formation; it is additionally capable of providing a relatively uniform current distribution along its conductors. The nine-channel transmit/receive NODES array achieved 7.5% higher B 1 + homogeneity than a loop array with the same number of elements. Excitation with the NODES array resulted in 33% lower peak 10g-averaged SAR and required 34% lower input power than the loop array for the target anatomy of the spine.

CONCLUSION: In this study, we introduced a new RF coil element: the NODES antenna. NODES antenna outperformed the widely used loop and dipole elements and may provide improved transmit/receive performance for future ultrahigh field MRI applications.

Original language	English (US)
Pages (from-to)	2074-2088
Number of pages	15
Journal	Magnetic resonance in medicine
Volume	87
Issue number	4
DOIs	https://doi.org/10.1002/mrm.29096
State	Published - Apr 2022

Bibliographical note

Funding Information:
This study was supported by the National Institutes of Health (NIH)/the National Institute of Biomedical Imaging and Bioengineering (NIBIB), grants P41 EB027061 and U01 EB025144. Also, the authors wish to thank the individuals who donated their bodies to the University of Minnesota’s Anatomy Bequest Program (ABP) for the advancement of education and research.

Funding Information:
This study was supported by the National Institutes of Health (NIH)/the National Institute of Biomedical Imaging and Bioengineering (NIBIB), grants P41 EB027061 and U01 EB025144 This study was supported by the National Institutes of Health (NIH)/the National Institute of Biomedical Imaging and Bioengineering (NIBIB), grants P41 EB027061 and U01 EB025144. Also, the authors wish to thank the individuals who donated their bodies to the University of Minnesota’s Anatomy Bequest Program (ABP) for the advancement of education and research.

Funding Information:
This study was supported by the National Institutes of Health (NIH)/the National Institute of Biomedical Imaging and Bioengineering (NIBIB), grants P41 EB027061 and U01 EB025144

Publisher Copyright:
© 2021 International Society for Magnetic Resonance in Medicine.

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Sadeghi-Tarakameh, A., Jungst, S., Lanagan, M., DelaBarre, L., Wu, X., Adriany, G., Metzger, G. J., Van de Moortele, P. F., Ugurbil, K., Atalar, E., & Eryaman, Y. (2022). A nine-channel transmit/receive array for spine imaging at 10.5 T: Introduction to a nonuniform dielectric substrate antenna. Magnetic resonance in medicine, 87(4), 2074-2088. https://doi.org/10.1002/mrm.29096

Sadeghi-Tarakameh, A , Jungst, S, Lanagan, M, DelaBarre, L , Wu, X , Adriany, G , Metzger, GJ, Van de Moortele, PF, Ugurbil, K, Atalar, E & Eryaman, Y 2022, 'A nine-channel transmit/receive array for spine imaging at 10.5 T: Introduction to a nonuniform dielectric substrate antenna', Magnetic resonance in medicine, vol. 87, no. 4, pp. 2074-2088. https://doi.org/10.1002/mrm.29096

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title = "A nine-channel transmit/receive array for spine imaging at 10.5 T: Introduction to a nonuniform dielectric substrate antenna",

abstract = "PURPOSE: The purpose of this study is to introduce a new antenna element with improved transmit performance, named the nonuniform dielectric substrate (NODES) antenna, for building transmit arrays at ultrahigh-field.METHODS: We optimized a dipole antenna at 10.5 Tesla by maximizing the B 1 + -SAR efficiency in a phantom for a human spine target. The optimization parameters included permittivity variation in the substrate, substrate thickness, antenna length, and conductor geometry. We conducted electromagnetic simulations as well as phantom experiments to compare the transmit/receive performance of the proposed NODES antenna design with existing coil elements from the literature. RESULTS: Single NODES element showed up to 18% and 30% higher B 1 + -SAR efficiency than the fractionated dipole and loop elements, respectively. The new element is substantially shorter than a commonly used dipole, which enables z-stacked array formation; it is additionally capable of providing a relatively uniform current distribution along its conductors. The nine-channel transmit/receive NODES array achieved 7.5% higher B 1 + homogeneity than a loop array with the same number of elements. Excitation with the NODES array resulted in 33% lower peak 10g-averaged SAR and required 34% lower input power than the loop array for the target anatomy of the spine. CONCLUSION: In this study, we introduced a new RF coil element: the NODES antenna. NODES antenna outperformed the widely used loop and dipole elements and may provide improved transmit/receive performance for future ultrahigh field MRI applications.",

author = "Alireza Sadeghi-Tarakameh and Steve Jungst and Mike Lanagan and Lance DelaBarre and Xiaoping Wu and Gregor Adriany and Metzger, {Gregory J.} and {Van de Moortele}, {Pierre Francois} and Kamil Ugurbil and Ergin Atalar and Yigitcan Eryaman",

note = "Funding Information: This study was supported by the National Institutes of Health (NIH)/the National Institute of Biomedical Imaging and Bioengineering (NIBIB), grants P41 EB027061 and U01 EB025144. Also, the authors wish to thank the individuals who donated their bodies to the University of Minnesota{\textquoteright}s Anatomy Bequest Program (ABP) for the advancement of education and research. Funding Information: This study was supported by the National Institutes of Health (NIH)/the National Institute of Biomedical Imaging and Bioengineering (NIBIB), grants P41 EB027061 and U01 EB025144 This study was supported by the National Institutes of Health (NIH)/the National Institute of Biomedical Imaging and Bioengineering (NIBIB), grants P41 EB027061 and U01 EB025144. Also, the authors wish to thank the individuals who donated their bodies to the University of Minnesota{\textquoteright}s Anatomy Bequest Program (ABP) for the advancement of education and research. Funding Information: This study was supported by the National Institutes of Health (NIH)/the National Institute of Biomedical Imaging and Bioengineering (NIBIB), grants P41 EB027061 and U01 EB025144 Publisher Copyright: {\textcopyright} 2021 International Society for Magnetic Resonance in Medicine.",

year = "2022",

month = apr,

doi = "10.1002/mrm.29096",

language = "English (US)",

volume = "87",

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T2 - Introduction to a nonuniform dielectric substrate antenna

AU - Sadeghi-Tarakameh, Alireza

AU - Jungst, Steve

AU - Lanagan, Mike

AU - DelaBarre, Lance

AU - Wu, Xiaoping

AU - Adriany, Gregor

AU - Metzger, Gregory J.

AU - Van de Moortele, Pierre Francois

AU - Ugurbil, Kamil

AU - Atalar, Ergin

AU - Eryaman, Yigitcan

N1 - Funding Information: This study was supported by the National Institutes of Health (NIH)/the National Institute of Biomedical Imaging and Bioengineering (NIBIB), grants P41 EB027061 and U01 EB025144. Also, the authors wish to thank the individuals who donated their bodies to the University of Minnesota’s Anatomy Bequest Program (ABP) for the advancement of education and research. Funding Information: This study was supported by the National Institutes of Health (NIH)/the National Institute of Biomedical Imaging and Bioengineering (NIBIB), grants P41 EB027061 and U01 EB025144 This study was supported by the National Institutes of Health (NIH)/the National Institute of Biomedical Imaging and Bioengineering (NIBIB), grants P41 EB027061 and U01 EB025144. Also, the authors wish to thank the individuals who donated their bodies to the University of Minnesota’s Anatomy Bequest Program (ABP) for the advancement of education and research. Funding Information: This study was supported by the National Institutes of Health (NIH)/the National Institute of Biomedical Imaging and Bioengineering (NIBIB), grants P41 EB027061 and U01 EB025144 Publisher Copyright: © 2021 International Society for Magnetic Resonance in Medicine.

PY - 2022/4

Y1 - 2022/4

N2 - PURPOSE: The purpose of this study is to introduce a new antenna element with improved transmit performance, named the nonuniform dielectric substrate (NODES) antenna, for building transmit arrays at ultrahigh-field.METHODS: We optimized a dipole antenna at 10.5 Tesla by maximizing the B 1 + -SAR efficiency in a phantom for a human spine target. The optimization parameters included permittivity variation in the substrate, substrate thickness, antenna length, and conductor geometry. We conducted electromagnetic simulations as well as phantom experiments to compare the transmit/receive performance of the proposed NODES antenna design with existing coil elements from the literature. RESULTS: Single NODES element showed up to 18% and 30% higher B 1 + -SAR efficiency than the fractionated dipole and loop elements, respectively. The new element is substantially shorter than a commonly used dipole, which enables z-stacked array formation; it is additionally capable of providing a relatively uniform current distribution along its conductors. The nine-channel transmit/receive NODES array achieved 7.5% higher B 1 + homogeneity than a loop array with the same number of elements. Excitation with the NODES array resulted in 33% lower peak 10g-averaged SAR and required 34% lower input power than the loop array for the target anatomy of the spine. CONCLUSION: In this study, we introduced a new RF coil element: the NODES antenna. NODES antenna outperformed the widely used loop and dipole elements and may provide improved transmit/receive performance for future ultrahigh field MRI applications.

AB - PURPOSE: The purpose of this study is to introduce a new antenna element with improved transmit performance, named the nonuniform dielectric substrate (NODES) antenna, for building transmit arrays at ultrahigh-field.METHODS: We optimized a dipole antenna at 10.5 Tesla by maximizing the B 1 + -SAR efficiency in a phantom for a human spine target. The optimization parameters included permittivity variation in the substrate, substrate thickness, antenna length, and conductor geometry. We conducted electromagnetic simulations as well as phantom experiments to compare the transmit/receive performance of the proposed NODES antenna design with existing coil elements from the literature. RESULTS: Single NODES element showed up to 18% and 30% higher B 1 + -SAR efficiency than the fractionated dipole and loop elements, respectively. The new element is substantially shorter than a commonly used dipole, which enables z-stacked array formation; it is additionally capable of providing a relatively uniform current distribution along its conductors. The nine-channel transmit/receive NODES array achieved 7.5% higher B 1 + homogeneity than a loop array with the same number of elements. Excitation with the NODES array resulted in 33% lower peak 10g-averaged SAR and required 34% lower input power than the loop array for the target anatomy of the spine. CONCLUSION: In this study, we introduced a new RF coil element: the NODES antenna. NODES antenna outperformed the widely used loop and dipole elements and may provide improved transmit/receive performance for future ultrahigh field MRI applications.

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A nine-channel transmit/receive array for spine imaging at 10.5 T: Introduction to a nonuniform dielectric substrate antenna

Abstract

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