Transmit-receive coil-arrays at 17.6T, configurations for 1H, 23Na, and 31P MRI
Transmit-receive coil-arrays at 17.6T, configurations for 1H, 23Na, and 31P MRI
复制标题
DOI：
10.1002/cmr.b.20055
复制
发表时间：
2006-02-01
影响因子：
0.9
通讯作者：
Griswold, MA
中科院分区：
文献类型：
--
作者：
Gareis, D;Neuberger, T;Griswold, MA
阵列线圈成像是全身 MRI 系统中的一种流行技术，但很少在垂直孔高保持磁体中实施。在这项工作中，为 H-1、Na-23 和 P-31 建造了三个发射-接收相控阵，以检验在 17.6 特斯拉磁场强度下使用这些阵列的可行性。这些线圈设计用于内径为 38 毫米的小鼠和大鼠的体内应用。每个阵列由两个表面线圈组成。相邻线圈的去耦是通过两个表面线圈的公共导体上的可变去耦电容器来实现的。可以同时驱动线圈以使用线圈之间的相对相移来提供相对高发射均匀性的区域。具有最佳均匀性的区域会根据相移而变化。图像是用两个接收器同时采集的，并且显示两个通道之间基本上没有耦合。与单通道鸟笼体积谐振器相比，该阵列在表面附近的 SNR 增益高达 34%。该阵列最适合穿透深度高达 20 毫米的线圈附近的物体（例如大鼠的脊髓或大脑）。 (c) 2006 年 Wiley 期刊公司
Array coil imaging is a popular technique in whole-body MRI systems but has seldom been implemented in vertical bore high-held magnets. in this work, three transmit-receive phased arrays for H-1, Na-23, and P-31 were built to examine the feasibility of using these arrays at the magnetic field strength of 17.6 Tesla. The coils were designed for in vivo applications on mice and rats with an inner diameter of 38 mm. Each array consisted of two surface coils. The decoupling of adjacent coils was achieved by a variable decoupling capacitor on the common conductor of the two surface-coils. The coils can be driven simultaneously to provide an area of relatively high transmit homogeneity using a relative phase shift between the coils. The area with best homogeneity changes, depending on this phase shift. images were simultaneously acquired with two receivers and showed essentially no coupling between the two channels. The arrays provide an SNR-gain compared to a single-channel birdcage-volume resonator of up to 34% near the surface. The arrays are most suitable for objects near the coils with a penetration depth of up to 20 mm (e.g., the spinal cord or the brain of a rat). (c) 2006 Wiley Periodicals, Inc.