Remotely adjustable MRI RF coil impedance matching circuit with mutualy coupled resonators

摘要

The RF coil and transmission line of a Magnetic Resonance Imaging (MRI) system are remotely tuned for variation from matched impedance conditions (e.g., as caused by variable loading of the RF coil by objects to be imaged which vary from an assumed median object) via a pair of series-connected over-coupled parallel-resonant circuits, each of which includes an adjustable capacitance.