低场磁共振成像仪阵列接收线圈的设计

Abstract

多通道射频线圈因其能提高图像信噪比在磁共振成像中有越来越多的应用。为了解决多通道射频接收线圈中回路之间信号耦合问题。在Wu B等提出LC去耦网络基础上提出了一种适用于圆柱面阵列射频接收线圈的去耦电路。在每个通道之间通过电感进行连接，并且用铜线连接四个通道的线圈形成等参考电位点。实现了用于0．5T磁共振关节成像仪的四通道射频接收线圈，实测结果表明。每个接收线圈之间有较好的隔离度（-19～-32dB），验证了该方法去耦可以达到较好的效果。

Multichannel coil arrays are increasingly being used to improve signal-to-noise ratio in magnetic resonance imaging （MRI）.To solve signal interference among RF channels in MRI phased array, based on Wu B＇s LC decoupling network, we designed a decoupling circuit for cylinder surface received arrays. We connected every two arrays with an inductor, a connecting ground line is also plased between the coils to provide a common reference point. A four-channel RF receive coil was made for 0.5T MRI system, experimental results show that there are good isolation （-19- -32 dB） between coil elements and good decoupling effect can be achieved.