Eight-channel phased array coil and detunable TEM volume coil for 7 T brain imaging
Eight-channel phased array coil and detunable TEM volume coil for 7 T brain imaging
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DOI：
10.1002/mrm.20547
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发表时间：
2005-07-01
影响因子：
3.3
通讯作者：
Wald, LL
中科院分区：
文献类型：
--
作者：
Wiggins, GC;Potthast, A;Wald, LL
开发了八通道仅接收脑线圈和桌面可解调体积发射线圈，并在 7 T 下进行了人体成像测试。该设备的优化需要注意阵列元件之间、发射和接收线圈之间的相互作用源以及同轴电缆上共模电流的最小化。圆形接收线圈（直径 85 毫米）设计在柔性线圈架上，紧密贴合头部周围并位于直径 270 毫米的 TEM 发射体积线圈内。在近皮层中，与 TEM 发射-接收线圈相比，该阵列的 SNR 增加了五倍，增益大于 3 T 下的同类线圈。更高的 SNR 增益可能是由于强介电效应，这导致体积线圈在皮层中的性能比在中央时差。大脑皮层的高分辨率图像证明了该阵列的灵敏度和覆盖范围。 (c) 2005 年 Wiley-Liss, Inc.
An eight-channel receive-only brain coil and table-top detunable volume transmit coil were developed and tested at 7 T for human imaging. Optimization of this device required attention to sources of interaction between the array elements, between the transmit and receive coils and minimization of common mode currents on the coaxial cables. Circular receive coils (85 mm dia.) were designed on a flexible former to fit tightly around the head and within a 270-mm diameter TEM transmit volume coil. In the near cortex, the array provided a fivefold increase in SNR compared to a TEM transmit-receive coil, a gain larger than that seen in comparable coils at 3 T. The higher SNR gain is likely due to strong dielectric effects, which cause the volume coil to perform poorly in the cortex compared to centrally. The sensitivity and coverage of the array is demonstrated with high-resolution images of the brain cortex. (c) 2005 Wiley-Liss, Inc.