External electromagnetic interference (EMI) in unshielded low field and portable MRI systems can swamp the signal, and various multi-detector methods have been developed to minimize it. A new EMI cancellation method designed for a single-channel receiver-system has been implemented on a 50 mT system by using the MR-inactive channel of a birdcage coil and a 180o power hybrid. This method results in up to a 97% reduction in the standard deviation of external EMI.
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