Q matrix approach to control implant heating by transmit array coils

The hazard of excessive local tissue heating due to metallic implants can be mitigated when utilizing the additional degrees of freedom of a transmit coil array. In this proof of principle study we used the single Q-matrix associated with the proximate tissue volume of a metallic implant to determine the 'worst case' steering conditions for implant heating. From a simple projection of the voltage vector to be applied to a sub space which is orthogonal to this 'worst case' voltage vector new steering conditions are determined which result in much lower implant heating. To demonstrate the efficacy of this method we performed thermal simulations using a 7T 8-channel head coil model. This approach can simply be embedded into B1-shimming procedures.

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