Abstract #2216

Reduction of the E field at the tip of implanted wires generated by pTx coils using RF current measurements

Gerd Weidemann¹, Frank Seifert¹, and Bernd Ittermann¹

¹Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin, Germany

The possibility to reduce implant heating is an added value option of parallel transmission. An orthogonal-projection method (OPM) is presented to reduce the E fields at the tip of wire type implants by using voltage vectors orthogonal to the vector inducing the worst case RF current at the protruding end of the implant. Experiments confirm that the minimization of RF current at the protruding end leads to a distinct reduction of the electric field at the tip of the wire. Low-hazard steering conditions for n-element pTx coils can be determined in real time during an MR investigation from the measurement of only n complex valued RF currents at the protruding end of the implant.

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