A 16-channel dipole antenna array for human head magnetic resonance imaging at 10.5 tesla

Myung Kyun Woo; Lance Delabarre; Matt Waks; Jerahmie Radder; Uk Su Choi; Russell L Lagore; Kamil Ugurbil; Gregor Adriany

doi:10.3390/s21217250

A 16-channel dipole antenna array for human head magnetic resonance imaging at 10.5 tesla

Myung Kyun Woo, Lance Delabarre, Matt Waks, Jerahmie Radder, Uk Su Choi, Russell L Lagore, Kamil Ugurbil, Gregor Adriany

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

5 Scopus citations

Abstract

For ultra-high field and frequency (UHF) magnetic resonance imaging (MRI), the associated short wavelengths in biological tissues leads to penetration and homogeneity issues at 10.5 tesla (T) and require antenna transmit arrays for efficiently generated 447 MHz B1⁺ fields (defined as the transmit radiofrequency (RF) magnetic field generated by RF coils). Previously, we evaluated a 16-channel combined loop + dipole antenna (LD) 10.5 T head array. While the LD array configuration did not achieve the desired B1⁺ efficiency, it showed an improvement of the specific absorption rate (SAR) efficiency compared to the separate 8-channel loop and separate 8-channel dipole antenna arrays at 10.5 T. Here we compare a 16-channel dipole antenna array with a 16-channel LD array of the same dimensions to evaluate B1⁺ efficiency, 10 g SAR, and SAR efficiency. The 16-channel dipole antenna array achieved a 24% increase in B1⁺ efficiency in the electromagnetic simulation and MR experiment compared to the LD array, as measured in the central region of a phantom. Based on the simulation results with a human model, we estimate that a 16-channel dipole antenna array for human brain imaging can increase B1⁺ efficiency by 15% with similar SAR efficiency compared to a 16-channel LD head array.

Original language	English (US)
Article number	7250
Journal	Sensors
Volume	21
Issue number	21
DOIs	https://doi.org/10.3390/s21217250
State	Published - Nov 1 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, National Research Foundation of Korea (NRF-2021R1A2B5B03002783) and the BK21 FOUR program of the Education and Research Program for Future ICT Pioneers, Seoul National University in A0426-20210100.

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

Keywords

Antenna coupling
Dipole antenna array
Human head imaging
Loop + dipole antenna
Magnetic resonance imaging
Multi-channel arrays
Ultra-high field

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10.3390/s21217250

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abstract = "For ultra-high field and frequency (UHF) magnetic resonance imaging (MRI), the associated short wavelengths in biological tissues leads to penetration and homogeneity issues at 10.5 tesla (T) and require antenna transmit arrays for efficiently generated 447 MHz B1+ fields (defined as the transmit radiofrequency (RF) magnetic field generated by RF coils). Previously, we evaluated a 16-channel combined loop + dipole antenna (LD) 10.5 T head array. While the LD array configuration did not achieve the desired B1+ efficiency, it showed an improvement of the specific absorption rate (SAR) efficiency compared to the separate 8-channel loop and separate 8-channel dipole antenna arrays at 10.5 T. Here we compare a 16-channel dipole antenna array with a 16-channel LD array of the same dimensions to evaluate B1+ efficiency, 10 g SAR, and SAR efficiency. The 16-channel dipole antenna array achieved a 24% increase in B1+ efficiency in the electromagnetic simulation and MR experiment compared to the LD array, as measured in the central region of a phantom. Based on the simulation results with a human model, we estimate that a 16-channel dipole antenna array for human brain imaging can increase B1+ efficiency by 15% with similar SAR efficiency compared to a 16-channel LD head array.",

keywords = "Antenna coupling, Dipole antenna array, Human head imaging, Loop + dipole antenna, Magnetic resonance imaging, Multi-channel arrays, Ultra-high field",

author = "Woo, {Myung Kyun} and Lance Delabarre and Matt Waks and Jerahmie Radder and Choi, {Uk Su} and Lagore, {Russell L} 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, National Research Foundation of Korea (NRF-2021R1A2B5B03002783) and the BK21 FOUR program of the Education and Research Program for Future ICT Pioneers, Seoul National University in A0426-20210100. Publisher Copyright: {\textcopyright} 2021 by the authors. Licensee MDPI, Basel, Switzerland.",

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AU - Lagore, Russell L

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, National Research Foundation of Korea (NRF-2021R1A2B5B03002783) and the BK21 FOUR program of the Education and Research Program for Future ICT Pioneers, Seoul National University in A0426-20210100. Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

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N2 - For ultra-high field and frequency (UHF) magnetic resonance imaging (MRI), the associated short wavelengths in biological tissues leads to penetration and homogeneity issues at 10.5 tesla (T) and require antenna transmit arrays for efficiently generated 447 MHz B1+ fields (defined as the transmit radiofrequency (RF) magnetic field generated by RF coils). Previously, we evaluated a 16-channel combined loop + dipole antenna (LD) 10.5 T head array. While the LD array configuration did not achieve the desired B1+ efficiency, it showed an improvement of the specific absorption rate (SAR) efficiency compared to the separate 8-channel loop and separate 8-channel dipole antenna arrays at 10.5 T. Here we compare a 16-channel dipole antenna array with a 16-channel LD array of the same dimensions to evaluate B1+ efficiency, 10 g SAR, and SAR efficiency. The 16-channel dipole antenna array achieved a 24% increase in B1+ efficiency in the electromagnetic simulation and MR experiment compared to the LD array, as measured in the central region of a phantom. Based on the simulation results with a human model, we estimate that a 16-channel dipole antenna array for human brain imaging can increase B1+ efficiency by 15% with similar SAR efficiency compared to a 16-channel LD head array.

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A 16-channel dipole antenna array for human head magnetic resonance imaging at 10.5 tesla

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