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Sensors
Volume 21
Issue 18
10.3390/s21186000
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Article

Evaluation of 8-Channel Radiative Antenna Arrays for Human Head Imaging at 10.5 Tesla

by
Myung Kyun Woo
1,2,
Lance DelaBarre
1,
Matt Thomas Waks
1,
Young Woo Park
1,
Russell Luke Lagore
1,
Steve Jungst
1,
Yigitcan Eryaman
1,
Se-Hong Oh
3,
Kamil Ugurbil
1 and
Gregor Adriany
1,*
1
Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN 55455, USA
2
Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Korea
3
Department of Biomedical Engineering, Hankuk University of Foreign Studies, Yongin 17035, Korea
*
Author to whom correspondence should be addressed.
Sensors 2021, 21(18), 6000; https://doi.org/10.3390/s21186000
Submission received: 28 July 2021 / Revised: 31 August 2021 / Accepted: 3 September 2021 / Published: 8 September 2021
(This article belongs to the Special Issue Antenna Technologies for Millimeter and Terahertz Sensing)
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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 center-fed antenna; dipole antenna; end-fed antenna; monopole antenna; sleeve antenna; ultra-high field imaging

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MDPI and ACS Style

Woo, M.K.; DelaBarre, L.; Waks, M.T.; Park, Y.W.; Lagore, R.L.; Jungst, S.; Eryaman, Y.; Oh, S.-H.; Ugurbil, K.; Adriany, G. Evaluation of 8-Channel Radiative Antenna Arrays for Human Head Imaging at 10.5 Tesla. Sensors 2021, 21, 6000. https://doi.org/10.3390/s21186000

AMA Style

Woo MK, DelaBarre L, Waks MT, Park YW, Lagore RL, Jungst S, Eryaman Y, Oh S-H, Ugurbil K, Adriany G. Evaluation of 8-Channel Radiative Antenna Arrays for Human Head Imaging at 10.5 Tesla. Sensors. 2021; 21(18):6000. https://doi.org/10.3390/s21186000

Chicago/Turabian Style

Woo, Myung Kyun, Lance DelaBarre, Matt Thomas Waks, Young Woo Park, Russell Luke Lagore, Steve Jungst, Yigitcan Eryaman, Se-Hong Oh, Kamil Ugurbil, and Gregor Adriany. 2021. "Evaluation of 8-Channel Radiative Antenna Arrays for Human Head Imaging at 10.5 Tesla" Sensors 21, no. 18: 6000. https://doi.org/10.3390/s21186000

APA Style

Woo, M. K., DelaBarre, L., Waks, M. T., Park, Y. W., Lagore, R. L., Jungst, S., Eryaman, Y., Oh, S.-H., Ugurbil, K., & Adriany, G. (2021). Evaluation of 8-Channel Radiative Antenna Arrays for Human Head Imaging at 10.5 Tesla. Sensors, 21(18), 6000. https://doi.org/10.3390/s21186000

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