A New Definition of Mutual Impedance between Two Coils for Simultaneous MRI Signal Reception

A new definition of mutual impedance for two coils used for simultaneous signal reception in MRI is introduced. The new mutual impedances are used to accurately quantify the mutual coupling effect between the two coils so that it can be removed from the measured terminal voltages. Using the new mutual impedances, a new decoupling method can be formulated to obtain the uncoupled voltages. Numerical results on two square coils are obtained and the uncoupled coil voltages calculated based on them indicate extremely small errors when compared with the ideal uncoupled voltages. The new mutual impedances are useful for MRI phased array designs