Eight-channel transmit/receive body MRI coil at 3T
Eight-channel transmit/receive body MRI coil at 3T
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DOI：
10.1002/mrm.21294
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发表时间：
2007-08-01
影响因子：
3.3
通讯作者：
Schuenemann, K.
中科院分区：
文献类型：
--
作者：
Vernickel, P.;Roeschmann, P.;Schuenemann, K.
多通道发射磁共振成像（MR）系统具有补偿由于组织中的波传播效应而在较高场强下发生的信号强度变化的潜力。可以应用诸如RF匀场和局部激励结合并行传输的方法来补偿这些影响。此外，可以应用并行传输来简化任意形状磁化图案的激励。这些方法的实施增加了MRI硬件方面的新要求。本文描述了一种用于3 T的去耦八元件发射/接收体线圈的设计。线圈的设置解释，从标准的单通道谐振器开始。特别关注的是放置在元件的去耦，以获得独立的RF谐振器。在简要讨论基本理论后，概述了线圈的特性和局限性。最后，使用RF测量以及MRI序列证明了线圈的功能和能力。
Multichannel transmit magnetic resonance imaging (MR) systems have the potential to compensate for signal-intensity variations occurring at higher field strengths due to wave propagation effects in tissue. Methods such as RF shimming and local excitation in combination with parallel transmission can be applied to compensate for these effects. Moreover, parallel transmission can be applied to ease the excitation of arbitrarily shaped magnetization patterns. The implementation of these methods adds new requirements in terms of MRI hardware. This article describes the design of a decoupled eight-element transmit/receive body coil for 3T. The setup of the coil is explained, starting with standard single-channel resonators. Special focus is placed on the decoupling of the elements to obtain independent RF resonators. After a brief discussion of the underlying theory, the properties and limitations of the coil are outlined. Finally, the functionality and capabilities of the coil are demonstrated using RF measurements as well as MRI sequences.