Comparison of RF body coils for MRI at 3  T: a simulation study using parallel transmission on various anatomical targets

NMR in Biomedicine
Xiaoping WuPierre-Francois Van de Moortele

Abstract

The performance of multichannel transmit coil layouts and parallel transmission (pTx) RF pulse design was evaluated with respect to transmit B1 (B1 (+)) homogeneity and specific absorption rate (SAR) at 3 T for a whole body coil. Five specific coils were modeled and compared: a 32-rung birdcage body coil (driven either in a fixed quadrature mode or a two-channel transmit mode), two single-ring stripline arrays (with either 8 or 16 elements), and two multi-ring stripline arrays (with two or three identical rings, stacked in the z axis and each comprising eight azimuthally distributed elements). Three anatomical targets were considered, each defined by a 3D volume representative of a meaningful region of interest (ROI) in routine clinical applications. For a given anatomical target, global or local SAR controlled pTx pulses were designed to homogenize RF excitation within the ROI. At the B1 (+) homogeneity achieved by the quadrature driven birdcage design, pTx pulses with multichannel transmit coils achieved up to about eightfold reduction in local and global SAR. When used for imaging head and cervical spine or imaging thoracic spine, the double-ring array outperformed all coils, including the single-ring arrays. While the advan...Continue Reading

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Citations

Apr 23, 2014·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Bastien GuérinLawrence L Wald
Mar 22, 2016·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Xiaoping WuPierre-François Van de Moortele
Apr 1, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Xiaoping WuKâmil Uğurbil
Jun 14, 2018·Physics in Medicine and Biology·Chunyi LiuStuart Crozier
Nov 14, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Zhipeng CaoWilliam A Grissom
Sep 26, 2020·Journal of Computer Assisted Tomography·Ruth P LimPatricia M Desmond
Mar 30, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Nader TavafPierre-Francois Van de Moortele
Jul 10, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Filiz YetisirLawrence L Wald

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