To achieve completely wireless coil arrays, several watts of power will need to be delivered with minimal impact on the MR images. Wireless power transfer (WPT) has been previously developed to efficiently transfer power, however, harmonics are generated and low frequency noise can be up-converted by both the DC-to-RF conversion and the RF-to-DC rectification of the WPT system. Efficiency can be traded off to reduce noise through additional filtering and rectifier choice, and by replacing the switching supply to the power amplifier with batteries an ultimate SNR performance within 6dB of the ideal can be achieved while continuously transferring power.
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