Ultra-high field MRI: parallel-transmit arrays and RF pulse design
Fecha
2023-01-18
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IOP Publishing
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Resumen
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.
Descripción
The authors would like to extend their thanks for the thoughtful commentary, suggestions, and revision help from the following colleagues: David A Porter (University of Glasgow), Sarah Allwood-Spiers (NHS Greater Glasgow & Clyde), Jürgen Herrler (FAU University Hospital Erlangen; Siemens Healthineers, Germany), Patrick Liebig (Siemens Healthineers, Germany), Belinda Ding and Iulius Dragonu (Siemens Healthineers, UK). The authors also acknowledge, UKRI Strength in Places Fund (SIPF0007/1) and UKRI Innovate UK (93468).
Citación
Williams SN, McElhinney P, Gunamony S. Ultra-high field MRI: parallel-transmit arrays and RF pulse design. Phys Med Biol. 2023; 68: 1-32.
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