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Abstract #2173

Digital RF Current Sources for safer, adjust-free MRI scanners

Oliver Heid1, Juergen Heller1, Xiaoyu Yang2, and Hiroyuki Fujita2

1Corporate Technology, Siemens AG, Erlangen, Germany, 2Quality Electrodynamics, Mayfield Village, OH, United States

We propose direct digital RF switch mode current sources to eliminate image artifacts due to B1 field amplitude errors without time consuming transmitter calibration and adjustment. In difference to all known linear analog or switch mode RF amplfiers our proposal maintains high efficiency under modulation, and thus provides sufficent average RF power even at low flip angles, e.g. in FLASH sequences. We thus avoid significant, safety critical transmitter oversizing as in conventional MRI scanners.

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