Improved 7 Tesla transmit field homogeneity with reduced electromagnetic power deposition using coupled Tic Tac Toe antennas

Abstract Recently cleared by the FDA, 7 Tesla (7 T) MRI is a rapidly growing technology that can provide higher resolution and enhanced contrast in human MRI images. However, the increased operational frequency (~ 297 MHz) hinders its full potential since it causes inhomogeneities in the images and...

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Autores principales:	Tales Santini, Sossena Wood, Narayanan Krishnamurthy, Tiago Martins, Howard J. Aizenstein, Tamer S. Ibrahim
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5166fe25569e4da9a96ad3b96828c606
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spelling	oai:doaj.org-article:5166fe25569e4da9a96ad3b96828c6062021-12-02T13:30:10ZImproved 7 Tesla transmit field homogeneity with reduced electromagnetic power deposition using coupled Tic Tac Toe antennas10.1038/s41598-020-79807-92045-2322https://doaj.org/article/5166fe25569e4da9a96ad3b96828c6062021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79807-9https://doaj.org/toc/2045-2322Abstract Recently cleared by the FDA, 7 Tesla (7 T) MRI is a rapidly growing technology that can provide higher resolution and enhanced contrast in human MRI images. However, the increased operational frequency (~ 297 MHz) hinders its full potential since it causes inhomogeneities in the images and increases the power deposition in the tissues. This work describes the optimization of an innovative radiofrequency (RF) head coil coupled design, named Tic Tac Toe, currently used in large scale human MRI scanning at 7 T; to date, this device was used in more than 1,300 neuro 7 T MRI scans. Electromagnetic simulations of the coil were performed using the finite-difference time-domain method. Numerical optimizations were used to combine the calculated electromagnetic fields produced by these antennas, based on the superposition principle, resulting in homogeneous magnetic field distributions at low levels of power deposition in the tissues. The simulations were validated in-vivo using the Tic Tac Toe RF head coil system on a 7 T MRI scanner.Tales SantiniSossena WoodNarayanan KrishnamurthyTiago MartinsHoward J. AizensteinTamer S. IbrahimNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tales Santini Sossena Wood Narayanan Krishnamurthy Tiago Martins Howard J. Aizenstein Tamer S. Ibrahim Improved 7 Tesla transmit field homogeneity with reduced electromagnetic power deposition using coupled Tic Tac Toe antennas
description	Abstract Recently cleared by the FDA, 7 Tesla (7 T) MRI is a rapidly growing technology that can provide higher resolution and enhanced contrast in human MRI images. However, the increased operational frequency (~ 297 MHz) hinders its full potential since it causes inhomogeneities in the images and increases the power deposition in the tissues. This work describes the optimization of an innovative radiofrequency (RF) head coil coupled design, named Tic Tac Toe, currently used in large scale human MRI scanning at 7 T; to date, this device was used in more than 1,300 neuro 7 T MRI scans. Electromagnetic simulations of the coil were performed using the finite-difference time-domain method. Numerical optimizations were used to combine the calculated electromagnetic fields produced by these antennas, based on the superposition principle, resulting in homogeneous magnetic field distributions at low levels of power deposition in the tissues. The simulations were validated in-vivo using the Tic Tac Toe RF head coil system on a 7 T MRI scanner.
format	article
author	Tales Santini Sossena Wood Narayanan Krishnamurthy Tiago Martins Howard J. Aizenstein Tamer S. Ibrahim
author_facet	Tales Santini Sossena Wood Narayanan Krishnamurthy Tiago Martins Howard J. Aizenstein Tamer S. Ibrahim
author_sort	Tales Santini
title	Improved 7 Tesla transmit field homogeneity with reduced electromagnetic power deposition using coupled Tic Tac Toe antennas
title_short	Improved 7 Tesla transmit field homogeneity with reduced electromagnetic power deposition using coupled Tic Tac Toe antennas
title_full	Improved 7 Tesla transmit field homogeneity with reduced electromagnetic power deposition using coupled Tic Tac Toe antennas
title_fullStr	Improved 7 Tesla transmit field homogeneity with reduced electromagnetic power deposition using coupled Tic Tac Toe antennas
title_full_unstemmed	Improved 7 Tesla transmit field homogeneity with reduced electromagnetic power deposition using coupled Tic Tac Toe antennas
title_sort	improved 7 tesla transmit field homogeneity with reduced electromagnetic power deposition using coupled tic tac toe antennas
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/5166fe25569e4da9a96ad3b96828c606
work_keys_str_mv	AT talessantini improved7teslatransmitfieldhomogeneitywithreducedelectromagneticpowerdepositionusingcoupledtictactoeantennas AT sossenawood improved7teslatransmitfieldhomogeneitywithreducedelectromagneticpowerdepositionusingcoupledtictactoeantennas AT narayanankrishnamurthy improved7teslatransmitfieldhomogeneitywithreducedelectromagneticpowerdepositionusingcoupledtictactoeantennas AT tiagomartins improved7teslatransmitfieldhomogeneitywithreducedelectromagneticpowerdepositionusingcoupledtictactoeantennas AT howardjaizenstein improved7teslatransmitfieldhomogeneitywithreducedelectromagneticpowerdepositionusingcoupledtictactoeantennas AT tamersibrahim improved7teslatransmitfieldhomogeneitywithreducedelectromagneticpowerdepositionusingcoupledtictactoeantennas
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Improved 7 Tesla transmit field homogeneity with reduced electromagnetic power deposition using coupled Tic Tac Toe antennas

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