Tomanek B, Ryner L, Hoult D I, Kozlowski P, Saunders J K
Institute of Nuclear Physics, Krakow, Poland.
Magn Reson Imaging. 1997;15(10):1199-204. doi: 10.1016/s0730-725x(97)00158-6.
The theory and construction of a dual surface coil which provides good B1 homogeneity and sensitivity in a defined volume of interest is described. The probe comprises two coaxial rings, of different diameters and in different planes, which carry opposing currents of different values. Current in the second ring compensates for the roll-off of the B1 field associated with a single surface coil. Coupling between the rings and a third matching ring is by mutual inductance only. A comparison to a traditional surface coil with practical application to pig brain imaging at a field strength of 7 Tesla is shown.
本文描述了一种双表面线圈的理论与构造，该线圈在特定感兴趣体积内具有良好的B1均匀性和灵敏度。该探头由两个同轴环组成，它们直径不同且位于不同平面，通有不同值的反向电流。第二个环中的电流补偿了与单表面线圈相关的B1场的衰减。环与第三个匹配环之间仅通过互感耦合。文中展示了与传统表面线圈的比较以及在7特斯拉场强下对猪脑成像的实际应用。
