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Abstract #2364

Local Coil versus Conventional Body Coil Transmission for Cardiac MR: B1+ Efficiency Improvements and Enhanced Blood Myocardium Contrast for 2D CINE SSFP Imaging at 3T

Oliver Kraus 1 , Lukas Winter 1 , Matthias Dieringer 1,2 , Andreas Graessl 1 , Jan Rieger 3 , Celal Oezerdem 1 , Fabian Hezel 1 , Andre Kuehne 4,5 , Patrick Waxmann 6 , Harald Pfeiffer 6 , and Thoralf Niendorf 1

1 Berlin Ultra-High Field Facility, Max-Delbrueck Center, Berlin, Germany, 2 Working Group on Cardiovascular MR, Experimental and Clinical Research Center (ECRC), Berlin, Germany, 3 MRI.TOOLS GmbH, Berlin, Germany, 4 Center for Medical Physics and Biomedical Enginieering, Medical University of Vienna, Austria, 5 MR Center of Excellence, Medical University of Vienna, Austria, 6 Medical Physics and Metrological Information Technology, Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany

In highfield cardiac MR flip angles are often limited by SAR constraints. To offset SAR constraints this study demonstrates the benefit of local transmit coils versus body/volume coil excitation. The applicability of a local 4-channel transceiver array is examined. Transmission performance and efficiency of the proposed array are explored. Our results demonstrate that larger flip angles can be achieved with local transceiver versus body coils before SAR limits are reached. The use of multi-channel transceiver coils underlines the need and value of local SAR considerations with the goal to attenuate SAR hotspots and to increase the applicable RF input power.

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