Ultra-high field MRI: parallel-transmit arrays and RF pulse design

Williams, S. N. , McElhinney, P. and Gunamony, S. (2023) Ultra-high field MRI: parallel-transmit arrays and RF pulse design. Physics in Medicine and Biology, 68(2), 02TR02. (doi: 10.1088/1361-6560/aca4b7)

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This paper reviews the field of multiple or parallel radiofrequency (RF) transmission for magnetic resonance imaging (MRI). Currently the use of ultra-high field (UHF) MRI at 7 tesla and above is gaining popularity, yet faces challenges with non-uniformity of the RF field and higher RF power deposition. Since its introduction in the early 2000s, parallel transmission (pTx) has been recognized as a powerful tool for accelerating spatially selective RF pulses and combating the challenges associated with RF inhomogeneity at UHF. We provide a survey of the types of dedicated RF coils used commonly for pTx and the important modeling of the coil behavior by electromagnetic (EM) field simulations. We also discuss the additional safety considerations involved with pTx such as the specific absorption rate (SAR) and how to manage them. We then describe the application of pTx with RF pulse design, including a practical guide to popular methods. Finally, we conclude with a description of the current and future prospects for pTx, particularly its potential for routine clinical use.

Item Type:Articles
Keywords:Radiofrequency (RF) coils, ultra-high field (UHF) magnetic resonance imaging (MRI), parallel transmission (pTx), electromagnetic (EM) fields, specific absorption rate (SAR).
Glasgow Author(s) Enlighten ID:Gunamony, Dr Shajan and Williams, Dr Sydney and McElhinney, Dr Paul
Authors: Williams, S. N., McElhinney, P., and Gunamony, S.
Subjects:Q Science > Q Science (General)
R Medicine > R Medicine (General)
College/School:College of Medical Veterinary and Life Sciences > School of Psychology & Neuroscience
Research Group:Imaging Centre of Excellence
Journal Name:Physics in Medicine and Biology
Journal Abbr.:Phys Med Biol
Publisher:IOP Publishing
ISSN (Online):1361-6560
Published Online:18 January 2023
Copyright Holders:Copyright © 2023 The Authors
First Published:First published in Physics in Medicine and Biology 68(2): 02TR02
Publisher Policy:Reproduced under a Creative Commons License

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