Radio-frequency coil signal chain for a low-field MRI system
AssigneeHyperfine Operations, Inc.
InventorsHadrien A. Dyvorne, Todd Rearick
Life of this patent
Estimating the term…
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.
Claims20
A switching circuit configured to be coupled to a radio-frequency (RF) coil of a low-field magnetic resonance imaging system, the switching circuit comprising:
- at least one field effect transistor (FET) configured to operate as an RF switch, wherein the at least one FET has a parasitic drain-source capacitance of less than 15 picoFarads.
A drive circuit configured to apply a gate voltage to at least one field-effect transistor (FET) configured to operate as a radio-frequency switch in a low-field magnetic resonance imaging system, the drive circuit comprising:
- at least one isolation element configured to isolate a voltage source from the at least one FET, wherein the at least one isolation element comprises a transformer.
A magnetic resonance imaging (MRI) system comprising:
- at least one radio-frequency (RF) coil;
- and
- at least one field effect transistor (FET) configured to operate as an RF switch for the at least one RF coil, wherein the at least one FET has a parasitic drain-source capacitance of less than 15 picoFarads.
Dependencies are inferred from the claim text.