Design and numerical evaluation of a volume coil array for parallel MR imaging at ultrahigh fields
Design and numerical evaluation of a volume coil array for parallel MR imaging at ultrahigh fields
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DOI：
10.3978/j.issn.2223-4292.2014.02.07
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发表时间：
2014-02-01
影响因子：
2.8
通讯作者：
Zhang, Xiaoliang
中科院分区：
文献类型：
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作者：
Pang, Yong;Wong, Ernest W. H.;Zhang, Xiaoliang
在这项工作中，我们提出并研究了一种使用不同类型鸟笼线圈进行磁共振成像的体线圈阵列设计方法。与传统射频线圈阵列的阵元为表面线圈不同，所提出的体积线圈阵列由一组独立的体积线圈组成，包括一个常规鸟笼线圈、一个横向鸟笼线圈和一个螺旋鸟笼线圈。这三个鸟笼线圈的磁通在本质上是相互抵消的，从而产生了高度去耦合的体积线圈阵列。与传统的非阵列式体线圈相比，体线圈阵列有利于提高磁共振信噪比，并具有实现并行成像的能力。在7T超高场下用FDTD数值模拟了体线圈阵列的性能，并计算了不同加速比下的g因子图，以考察其并行成像性能。
In this work, we propose and investigate a volume coil array design method using different types of birdcage coils for MR imaging. Unlike the conventional radiofrequency (RF) coil arrays of which the array elements are surface coils, the proposed volume coil array consists of a set of independent volume coils including a conventional birdcage coil, a transverse birdcage coil, and a helix birdcage coil. The magnetic fluxes of these three birdcage coils are intrinsically cancelled, yielding a highly decoupled volume coil array. In contrast to conventional non-array type volume coils, the volume coil array would be beneficial in improving MR signal-to-noise ratio (SNR) and also gain the capability of implementing parallel imaging. The volume coil array is evaluated at the ultrahigh field of 7T using FDTD numerical simulations, and the g-factor map at different acceleration rates was also calculated to investigate its parallel imaging performance.