AUTOMATED DECOUPLING OF RF RECEIVE COIL ELEMENTS

摘要

The invention discloses a decoupling circuit (32) disposed between adjacent RF receive coil elements to automatically decouple the adjacent MRI RF receive coil elements. In one embodiment, the invention involves to inject an RF signal into a first coil element, to measure the RF signal coupled from the first coil element into a second coil element and to adjust the capacitance of the decoupling circuit such as to minimize the coupling between the first and the second coil elements.

主权项

1. A magnetic resonance system, comprising:
a magnet which generates a static magnetic field in an examination region; a RF transmitter and a RF transmit coil which generates RF pulses at a magnetic frequency to excite and manipulate resonance in the examination region; at least one RF receive coil assembly including a plurality of RF receive coil elements configured to acquire magnetic resonance data from the examination region; at least one RF receiver connected to the at least one RF receive coil assembly; a scan controller configured to control the RF transmitter and RF receiver to perform scans; a measurement and control unit configured to determine mutual inductance between adjacent first and second RF receive coil elements of the plurality of RF receive coil elements and determine a control signal based on the determined mutual inductance; and a detuning circuit disposed between the adjacent first and second RF receive coil elements to automatically decouple the adjacent first and second RF receive coil elements in response to the control signal from the measurement and control unit a scan controller (20) configured to control the RF transmitter (24) and RF receiver (26), wherein the detuning circuit comprises a capacitance bank including a number of capacitors and a number of switches for selectively switching in a desired number of the capacitors, each capacitor having a switch controlled by the control signal from the measurement and control unit, wherein the measurement and control unit is further configured to control the detuning circuit by selectin the desired number of the capacitors that minimizes the determined mutual inductance between the adjacent first and second RF receive coil elements.