Transmit Arrays & Circuitry
Roberta Frass-Kriegl1, Sigrun Goluch-Roat1, Lena Nohava1,2, Michael Pichler1, and Elmar Laistler1
1Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria, 2IR4M (Imagerie par Résonance Magnétique et Multi-Modalités), UMR 8081, Université Paris-Sud/CNRS, Université Paris-Saclay, Orsay, France
Synopsis
RF transmission in MR measurements relies on RF coils, the transmit system (typically part of the MR scanner), and RF pulse design. In this educational presentation, basic principles of transmit coil arrays and related circuitry will be explained for single channel as well as multi-channel transmit systems. The potential of static B1+ shimming and full parallel RF transmission will be discussed including the aspect of more complicated safety evaluation in terms of specific absorption rate (SAR) with increased degrees of freedom.
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