Evaluation of 8-channel radiative antenna arrays for human head imaging at 10.5 tesla

Myung Kyun Woo; Lance Delabarre; Matt Thomas Waks; Young Woo Park; Russell Luke Lagore; Steve Jungst; Yigitcan Eryaman; Se Hong Oh; Kamil Ugurbil; Gregor Adriany

doi:10.3390/s21186000

Evaluation of 8-channel radiative antenna arrays for human head imaging at 10.5 tesla

Myung Kyun Woo, Lance Delabarre, Matt Thomas Waks, Young Woo Park, Russell Luke Lagore, Steve Jungst, Yigitcan Eryaman, Se Hong Oh, Kamil Ugurbil, Gregor Adriany

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

For human head magnetic resonance imaging at 10.5 tesla (T), we built an 8-channel transceiver dipole antenna array and evaluated the influence of coaxial feed cables. The influence of coaxial feed cables was evaluated in simulation and compared against a physically constructed array in terms of transmit magnetic field (B₁⁺) and specific absorption rate (SAR) efficiency. A substantial drop (23.1% in simulation and 20.7% in experiment) in B₁⁺ efficiency was observed with a tight coaxial feed cable setup. For the investigation of the feed location, the center-fed dipole antenna array was compared to two 8-channel end-fed arrays: monopole and sleeve antenna arrays. The simulation results with a phantom indicate that these arrays achieved ~24% higher SAR efficiency compared to the dipole antenna array. For a human head model, we observed 30.8% lower SAR efficiency with the 8-channel monopole antenna array compared to the phantom. Importantly, our simulation with the human model indicates that the sleeve antenna arrays can achieve 23.8% and 21% higher SAR efficiency compared to the dipole and monopole antenna arrays, respectively. Finally, we obtained high-resolution human cadaver images at 10.5 T with the 8-channel sleeve antenna array.

Original language	English (US)
Article number	6000
Journal	Sensors
Volume	21
Issue number	18
DOIs	https://doi.org/10.3390/s21186000
State	Published - Sep 2021

Bibliographical note

Funding Information:
Funding: This research was funded by the U.S. Department of National Institutes of Health under Grants U01-EB025144, S10-RR029672, P41-EB015894, P41-EB027061, P30-NS076408, BK21 FOUR program of the Education and Research Program for Future ICT Pioneers, Seoul National University in A0426-20210100, National Research Foundation of Korea (NRF-2020R1A2C4001623), and the Hankuk University of Foreign Studies Research Fund.

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

Center-fed antenna
Dipole antenna
End-fed antenna
Monopole antenna
Sleeve antenna
Ultra-high field imaging

Center for Magnetic Resonance Research (CMRR) tags

MRE
P41

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10.3390/s21186000

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@article{ed88ee147c7c4e20ba69492d8ca442ae,

title = "Evaluation of 8-channel radiative antenna arrays for human head imaging at 10.5 tesla",

abstract = "For human head magnetic resonance imaging at 10.5 tesla (T), we built an 8-channel transceiver dipole antenna array and evaluated the influence of coaxial feed cables. The influence of coaxial feed cables was evaluated in simulation and compared against a physically constructed array in terms of transmit magnetic field (B1+) and specific absorption rate (SAR) efficiency. A substantial drop (23.1% in simulation and 20.7% in experiment) in B1+ efficiency was observed with a tight coaxial feed cable setup. For the investigation of the feed location, the center-fed dipole antenna array was compared to two 8-channel end-fed arrays: monopole and sleeve antenna arrays. The simulation results with a phantom indicate that these arrays achieved ~24% higher SAR efficiency compared to the dipole antenna array. For a human head model, we observed 30.8% lower SAR efficiency with the 8-channel monopole antenna array compared to the phantom. Importantly, our simulation with the human model indicates that the sleeve antenna arrays can achieve 23.8% and 21% higher SAR efficiency compared to the dipole and monopole antenna arrays, respectively. Finally, we obtained high-resolution human cadaver images at 10.5 T with the 8-channel sleeve antenna array.",

keywords = "Center-fed antenna, Dipole antenna, End-fed antenna, Monopole antenna, Sleeve antenna, Ultra-high field imaging",

author = "Woo, {Myung Kyun} and Lance Delabarre and Waks, {Matt Thomas} and Park, {Young Woo} and Lagore, {Russell Luke} and Steve Jungst and Yigitcan Eryaman and Oh, {Se Hong} and Kamil Ugurbil and Gregor Adriany",

note = "Funding Information: Funding: This research was funded by the U.S. Department of National Institutes of Health under Grants U01-EB025144, S10-RR029672, P41-EB015894, P41-EB027061, P30-NS076408, BK21 FOUR program of the Education and Research Program for Future ICT Pioneers, Seoul National University in A0426-20210100, National Research Foundation of Korea (NRF-2020R1A2C4001623), and the Hankuk University of Foreign Studies Research Fund. Publisher Copyright: {\textcopyright} 2021 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2021",

month = sep,

doi = "10.3390/s21186000",

language = "English (US)",

volume = "21",

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AU - Woo, Myung Kyun

AU - Delabarre, Lance

AU - Waks, Matt Thomas

AU - Park, Young Woo

AU - Lagore, Russell Luke

AU - Jungst, Steve

AU - Eryaman, Yigitcan

AU - Oh, Se Hong

AU - Ugurbil, Kamil

AU - Adriany, Gregor

N1 - Funding Information: Funding: This research was funded by the U.S. Department of National Institutes of Health under Grants U01-EB025144, S10-RR029672, P41-EB015894, P41-EB027061, P30-NS076408, BK21 FOUR program of the Education and Research Program for Future ICT Pioneers, Seoul National University in A0426-20210100, National Research Foundation of Korea (NRF-2020R1A2C4001623), and the Hankuk University of Foreign Studies Research Fund. Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2021/9

Y1 - 2021/9

N2 - For human head magnetic resonance imaging at 10.5 tesla (T), we built an 8-channel transceiver dipole antenna array and evaluated the influence of coaxial feed cables. The influence of coaxial feed cables was evaluated in simulation and compared against a physically constructed array in terms of transmit magnetic field (B1+) and specific absorption rate (SAR) efficiency. A substantial drop (23.1% in simulation and 20.7% in experiment) in B1+ efficiency was observed with a tight coaxial feed cable setup. For the investigation of the feed location, the center-fed dipole antenna array was compared to two 8-channel end-fed arrays: monopole and sleeve antenna arrays. The simulation results with a phantom indicate that these arrays achieved ~24% higher SAR efficiency compared to the dipole antenna array. For a human head model, we observed 30.8% lower SAR efficiency with the 8-channel monopole antenna array compared to the phantom. Importantly, our simulation with the human model indicates that the sleeve antenna arrays can achieve 23.8% and 21% higher SAR efficiency compared to the dipole and monopole antenna arrays, respectively. Finally, we obtained high-resolution human cadaver images at 10.5 T with the 8-channel sleeve antenna array.

AB - For human head magnetic resonance imaging at 10.5 tesla (T), we built an 8-channel transceiver dipole antenna array and evaluated the influence of coaxial feed cables. The influence of coaxial feed cables was evaluated in simulation and compared against a physically constructed array in terms of transmit magnetic field (B1+) and specific absorption rate (SAR) efficiency. A substantial drop (23.1% in simulation and 20.7% in experiment) in B1+ efficiency was observed with a tight coaxial feed cable setup. For the investigation of the feed location, the center-fed dipole antenna array was compared to two 8-channel end-fed arrays: monopole and sleeve antenna arrays. The simulation results with a phantom indicate that these arrays achieved ~24% higher SAR efficiency compared to the dipole antenna array. For a human head model, we observed 30.8% lower SAR efficiency with the 8-channel monopole antenna array compared to the phantom. Importantly, our simulation with the human model indicates that the sleeve antenna arrays can achieve 23.8% and 21% higher SAR efficiency compared to the dipole and monopole antenna arrays, respectively. Finally, we obtained high-resolution human cadaver images at 10.5 T with the 8-channel sleeve antenna array.

KW - Center-fed antenna

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KW - Monopole antenna

KW - Sleeve antenna

KW - Ultra-high field imaging

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ER -

Evaluation of 8-channel radiative antenna arrays for human head imaging at 10.5 tesla

Abstract

Bibliographical note

Keywords

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