Minimal Acceptable Blocking Impedance for RF Receive Coils

Victor Taracila¹, Pei Chan¹, Fraser Robb¹

During the transmit phase of the MR sequence the receiving coils are usually detuned to minimize body coil disturbance. This is typically achieved with passive or active decoupling parallel tank circuits which, when active, create very high impedance in coil elements so that the current induced into them is very small and does not affect the process of magnetization tipping. When planning the build of a coil, the magnitude and the number of decoupling boards required for every receive element needs to be considered. In this work we deduce a simple rule for quick evaluation of the required blocking impedance.