Radio-frequency coil signal chain for a low-field MRI system
AssigneeHyperfine Operations, Inc.
InventorsHadrien A. Dyvorne, Todd Rearick
Life of this patent
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Abstract
Methods and apparatus for reducing noise in RF signal chain circuitry for a low-field magnetic resonance imaging system are provided. A switching circuit in the RF signal chain circuitry may include at least one field effect transistor (FET) configured to operate as an RF switch at an operating frequency of less than 10 MHz. A decoupling circuit may include tuning circuitry coupled across inputs of an amplifier and active feedback circuitry coupled between an output of the amplifier and an input of the amplifier, wherein the active feedback circuitry includes a feedback capacitor configured to reduce a quality factor of an RF coil coupled to the amplifier.
Claims16
A circuit configured to tune a radio frequency (RF) coil coupled to an amplifier of a low-field magnetic resonance imaging system, the circuit comprising:
- tuning circuitry coupled across inputs of the amplifier;
- and
- feedback circuitry coupled between an output of the amplifier and an input of the amplifier, wherein the feedback circuitry includes mutual inductive circuitry including at least one inductor.
A circuit configured to tune a radio frequency (RF) coil coupled to an amplifier of a low-field magnetic resonance imaging system, the circuit comprising:
- feedback circuitry coupled between an output of the amplifier and an input of the amplifier to reduce a quality factor of the RF coil, wherein the feedback circuitry is configured to provide a first feedback signal 180 degrees out of phase with a center frequency of the RF coil;
- and
- tuning circuitry coupled across inputs of the amplifier, wherein the tuning circuitry comprises a tuning/matching network including at least one capacitor and at least one inductor.
A method of tuning a radio frequency (RF) coil coupled to an amplifier of a low-field magnetic resonance imaging system, the method comprising:
- arranging tuning circuitry across first and second inputs of the amplifier;
- and
- coupling feedback circuitry between an output of the amplifier and an input of the amplifier;
- wherein the tuning circuitry comprises a tuning/matching network including at least one capacitor and at least one inductor.
Dependencies are inferred from the claim text.