Using s-parameter measurements to manage sar and transmit gain
AssigneeGeneral Electric Company
InventorGraeme Colin McKinnon
Life of this patent
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Abstract
Systems and methods for controlling a magnetic resonance imaging system are provided. In one embodiment, a magnetic resonance imaging system includes a radio frequency coil with a plurality of conductive coil elements, control circuitry that determines, based at least in part on a measurement of scattering parameters, a plurality of forward voltages that will cause power deposition into an object within a predetermined specific absorption rate, and an amplifier configured to apply the determined plurality of forward voltages respectively to the plurality of coil elements. The control circuitry may determine the plurality of forward voltages based at least in part on an unloaded measurement of scattering parameters and a loaded measurement of scattering parameters.
Claims20
A magnetic resonance imaging system comprising:
- a radio frequency coil having a plurality of conductive coil elements;
- control circuitry configured to determine, based at least in part on a measurement of scattering parameters, a plurality of forward voltages that is predicted to cause a deposition of power into an object within the radio frequency coil when applied respectively to the plurality of coil elements, wherein the deposition of power is within a predetermined specific absorption rate;
- and
- a radio frequency coil amplifier configured to apply the determined plurality of forward voltages respectively to the plurality of coil elements.
A magnetic resonance imaging system comprising:
- a radio frequency coil assembly configured to obtain a measurement of scattering parameters.
A magnetic resonance imaging system comprising:
- a radio frequency coil;
- an amplifier configured to drive the radio frequency coil based on a control signal;
- and
- control circuitry operably connected to the amplifier and configured to provide the control signal to the amplifier, the control circuitry capable of:
- receiving an unloaded measurement of scattering parameters of the radio frequency coil;
- receiving a loaded measurement of scattering parameters of the radio frequency coil;
- and
- determining the control signal, based at least in part on the unloaded measurement of scattering parameters and the loaded measurement of scattering parameters, that is predicted to cause the amplifier to drive the radio frequency coil to deposit an amount of power into an object within the radio frequency coil, wherein the amount of power into the object is within a predetermined specific absorption rate.
Dependencies are inferred from the claim text.