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Abstract #4423

Safe Online Local SAR Calculation for Transmit Arrays Using Asynchron Data Processing

Rene Gumbrecht1, 2, Thomas Benner1, Ulrich Fontius1, Holger Adolf1, Andreas K. Bitz3, Hans-Peter Fautz1

1Siemens Healthcare, Erlangen, Germany; 2Department of Physics, Friedrich-Alexander University, Erlangen, Germany; 3Erwin L. Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, Essen, Germany

A RF supervision concept that considers local SAR is an essential pre-requisite for high performance pTX applications. It needs to provide at least one online RF supervision component that detects violation of local SAR limits in real-time. Using the MR signal processing unit for that fails to match real-time requirements. In this study, an online local SAR calculation was implemented on the image reconstruction PC of a MRI system. To overcome latency issues, a real-time logic in conjunction with a real-time global SAR supervision unit is used to guarantee patient safety at all times