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Abstract #1054

A 16 channel head-only pTX array using high efficiency in-bore RFPAs at 3T

Michael Twieg1, Bhairav B Mehta1, Simone Coppo1, Jan Ruff2, Rene Gumbrecht2, and Mark A Griswold1

1Dept of Radiology, Case Western Reserve University, Cleveland, OH, United States, 2Siemens Healthcare GmbH, Erlangen, Germany

Parallel transmit (pTX) has been proposed as a solution to flip angle inhomogeneity and SAR at ultrahigh fields, as well as safety hazards with implantable devices. However, pTX systems come at high cost, partially due to the use of remotely located linear RF power amplifiers (RFPAs), which have poor power efficiency and rely on costly RF power cables to couple power to the subject. Here we demonstrate a 16 channel transmit array utilizing high efficiency RFPA modules inside the scanner bore. They RFPAs can deliver a total of over 1kW to the array while only cooled by natural convection.

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