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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