A 16-Channel Dipole Antenna Array for Human Head Magnetic Resonance Imaging at 10.5 Tesla

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 B<sub>1</sub><sup>+&...

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Autores principales:	Myung Kyun Woo, Lance DelaBarre, Matt Waks, Jerahmie Radder, Uk-Su Choi, Russell Lagore, Kamil Ugurbil, Gregor Adriany
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	antenna coupling dipole antenna array human head imaging loop + dipole antenna magnetic resonance imaging multi-channel arrays Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/c119c9cdae564401a8c01d350d677c61
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id	oai:doaj.org-article:c119c9cdae564401a8c01d350d677c61
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spelling	oai:doaj.org-article:c119c9cdae564401a8c01d350d677c612021-11-11T19:13:08ZA 16-Channel Dipole Antenna Array for Human Head Magnetic Resonance Imaging at 10.5 Tesla10.3390/s212172501424-8220https://doaj.org/article/c119c9cdae564401a8c01d350d677c612021-10-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/21/7250https://doaj.org/toc/1424-8220For 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 B<sub>1</sub><sup>+</sup> 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 B<sub>1</sub><sup>+</sup> 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 B<sub>1</sub><sup>+</sup> efficiency, 10 g SAR, and SAR efficiency. The 16-channel dipole antenna array achieved a 24% increase in B<sub>1</sub><sup>+</sup> 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 B<sub>1</sub><sup>+</sup> efficiency by 15% with similar SAR efficiency compared to a 16-channel LD head array.Myung Kyun WooLance DelaBarreMatt WaksJerahmie RadderUk-Su ChoiRussell LagoreKamil UgurbilGregor AdrianyMDPI AGarticleantenna couplingdipole antenna arrayhuman head imagingloop + dipole antennamagnetic resonance imagingmulti-channel arraysChemical technologyTP1-1185ENSensors, Vol 21, Iss 7250, p 7250 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	antenna coupling dipole antenna array human head imaging loop + dipole antenna magnetic resonance imaging multi-channel arrays Chemical technology TP1-1185
spellingShingle	antenna coupling dipole antenna array human head imaging loop + dipole antenna magnetic resonance imaging multi-channel arrays Chemical technology TP1-1185 Myung Kyun Woo Lance DelaBarre Matt Waks Jerahmie Radder Uk-Su Choi Russell Lagore Kamil Ugurbil Gregor Adriany A 16-Channel Dipole Antenna Array for Human Head Magnetic Resonance Imaging at 10.5 Tesla
description	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 B<sub>1</sub><sup>+</sup> 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 B<sub>1</sub><sup>+</sup> 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 B<sub>1</sub><sup>+</sup> efficiency, 10 g SAR, and SAR efficiency. The 16-channel dipole antenna array achieved a 24% increase in B<sub>1</sub><sup>+</sup> 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 B<sub>1</sub><sup>+</sup> efficiency by 15% with similar SAR efficiency compared to a 16-channel LD head array.
format	article
author	Myung Kyun Woo Lance DelaBarre Matt Waks Jerahmie Radder Uk-Su Choi Russell Lagore Kamil Ugurbil Gregor Adriany
author_facet	Myung Kyun Woo Lance DelaBarre Matt Waks Jerahmie Radder Uk-Su Choi Russell Lagore Kamil Ugurbil Gregor Adriany
author_sort	Myung Kyun Woo
title	A 16-Channel Dipole Antenna Array for Human Head Magnetic Resonance Imaging at 10.5 Tesla
title_short	A 16-Channel Dipole Antenna Array for Human Head Magnetic Resonance Imaging at 10.5 Tesla
title_full	A 16-Channel Dipole Antenna Array for Human Head Magnetic Resonance Imaging at 10.5 Tesla
title_fullStr	A 16-Channel Dipole Antenna Array for Human Head Magnetic Resonance Imaging at 10.5 Tesla
title_full_unstemmed	A 16-Channel Dipole Antenna Array for Human Head Magnetic Resonance Imaging at 10.5 Tesla
title_sort	16-channel dipole antenna array for human head magnetic resonance imaging at 10.5 tesla
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/c119c9cdae564401a8c01d350d677c61
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A 16-Channel Dipole Antenna Array for Human Head Magnetic Resonance Imaging at 10.5 Tesla

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