Abstract #4062

UHF MRI at 14 T: Initial transmit performance analysis of 8-channel local RF arrays using fractionated dipoles

Marco L. Wittrich¹, Andreas K. Bitz^1,2, Jonathan K. Stelter¹, Mark E. Ladd^1,3,4, and Thomas M. Fiedler¹

¹Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, ²Electromagnetic Theory and Applied Mathematics, Faculty of Electrical Engineering and Information Technology, FH Aachen – University of Applied Sciences, Aachen, Germany, ³Erwin L. Hahn Institute for MRI, University Duisburg-Essen, Essen, Germany, ⁴Faculty of Physics and Astronomy and Faculty of Medicine, University of Heidelberg, Heidelberg, Germany

Numerical simulations were used to design and evaluate antenna arrays for body imaging at 14T. Previously presented fractionated dipole designs for 7T and 10.5T were adapted for 14T. Pulse optimization was performed in volumes with different sizes. In general, the RF shim performance decreases at higher RF frequency. The performance of 14T arrays in ROIs located in the body center is further limited by local SAR limits, as the SAR efficiency ($$$B_1^+$$$ normalized to $$$\sqrt{\operatorname{SAR}_{10g,max}}$$$) is lower in the body center.

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