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US 11,693,069 B2Granted
Tunable metamaterial device for concentrating magnetic field of RF signals in an MRI system
AssigneeMedical Wireless Sensing Ltd.
InventorsEfthymios Kallos, Shimul Chandra Saha
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Abstract
The present disclosure is directed to a device and a magnetic resonance system for concentrating a magnetic field of radio frequency signals, and methods for concentrating a magnetic field of as radio frequency signal in an object to be imaged.
Claims20
A device for concentrating a magnetic field of RF signals in an MR system, the device comprising:
- a plurality of conductive elements arranged in an array, wherein the array is arranged to redistribute energy between electric and magnetic fields of RF radiation at a resonant RF frequency when receiving an RF signal having a RF wavelength greater than a respective dimension of each conductive element;
- a plurality of semiconductor devices each connected between two respective portions of the conductive elements;
- and
- a controller to control a bias voltage of each semiconductor device, thereby controlling the resonant frequency of the array.
1 more element
A method of concentrating a magnetic field of an RF signal in an object to be imaged in an MR system, the method comprising:
- placing a device comprising a plurality of conductive elements arranged in an array in proximity of the object to be imaged using the MR system, wherein the array is arranged to redistribute energy between electric and magnetic fields of RF radiation at a resonant RF frequency when receiving the RF signal having a RF wavelength greater than a respective dimension of each conductive element;
- irradiating the device and object with the RF signal;
- receiving a return RF signal from the conductive elements and object to image the object;
- and
- controlling a bias voltage of each semiconductor device of a plurality of semiconductor devices connected to conductive elements in the array to change the resonant frequency of the plurality of conductive elements.
2 more elements
Dependencies are inferred from the claim text.