Requardt H, Offermann J, Erhard P
Siemens AG, UB Med, MR Development Department, Erlangen, West Germany.
Magn Reson Med. 1990 Mar;13(3):385-97. doi: 10.1002/mrm.1910130306.
Switched array coils (SACs) are a useful tool in local coil imaging since they allow in a user-friendly manner one to make the best choice in the trade-off between field of view and signal-to-noise ratio. This is done by selecting the current path within a conductor array equipped with suitable switches. Since the switching can be controlled by the system, this allows changing of the coil dimensions within multislice sequences. Thus image quality can be improved due to smaller coil dimensions for a given slice and a larger area can be covered by electronically shifting this sensitive area. The principle can be applied to surface--as well as volume--coil designs.
开关阵列线圈（SACs）是局部线圈成像中的一种有用工具，因为它们能以用户友好的方式让人们在视野和信噪比之间做出最佳权衡选择。这是通过在配备合适开关的导体阵列中选择电流路径来实现的。由于开关可由系统控制，这使得在多层序列中能够改变线圈尺寸。因此，对于给定切片，由于线圈尺寸较小，图像质量得以提高，并且通过电子移动这个敏感区域可以覆盖更大的面积。该原理可应用于表面线圈和容积线圈设计。
