Patent ID: 9720060
Date: 2017-08-01
CPC Classifications: G01R

Claim:
1. A radio frequency (RF) receive coil assembly for use in magnetic resonance, including: a radio frequency receive coil; and an electronic switch which switches between open and closed states to detune and tune the coil to a preselected resonance frequency, each electronic switch including: at least one field effect transistor (FET) and a bias network, wherein each of the at least one FET has a gate, wherein the bias network is configured to provide a bias voltage to the gate of each of the at least one FET to switch the at least one FET from the closed state to the open state, wherein the bias network is configured to provide the bias voltage in response to a self bias signal, the bias network further being configured to provide the bias voltage in response to a control signal, wherein the RF coil is a loop coil and the at least one FET is connected in the loop to tune the loop coil to the MR frequency when the at least one FET is closed and to detune the loop coil when the at least one FET is open, and wherein the electronic switch further includes a self bias network configured to generate the self bias signal by rectifying part of an incident RF signal.