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System and method for control of RF circuits for use with an MRI system

  • US 9,500,727 B2
  • Filed: 04/22/2013
  • Issued: 11/22/2016
  • Est. Priority Date: 04/20/2012
  • Status: Active Grant
First Claim
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1. A radio-frequency (RF) system for use with a magnetic resonance imaging (MRI) system during a imaging process of a subject, the RF system comprising:

  • a radio frequency (RF) element configured to at least one of transmit RF energy to and receive RF energy from the subject during the medical imaging process;

    an array of reactive components coupled to the RF element and configured to adjust at least one of an impedance transformation and a frequency tuning associated with the RF element;

    a mismatch detector circuit configured to measure a reflected signal from the RF element using a coupler including a coupling port and an isolated port separated by a desired phase shift providing isolation therebetween; and

    a feedback circuit configured to receive an indication of the reflected signal from the mismatch detector circuit and automatically determine at least one of an impedance adjustment and a frequency tuning to be implemented by adjusting the array of reactive components based on the reflected signal to effectuate transmit-receive isolation.

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