Abstract #0297

Optimizing the Topography of Transmit Coils for SAR Management

Alireza Sadeghi-Tarakameh^1,2, Angel Torrado-Carvajal³, Cemre Ariyurek^1,2, Ergin Atalar^1,2, Gregor Adriany⁴, Gregory J. Metzger⁴, Russell L. Lagore⁴, Lance DelaBarre⁴, Andrea Grant⁴, Pierre-Francois Van de Moortele⁴, Kamil Ugurbil⁴, and Yigitcan Eryaman⁴

¹Electrical and Electronics Engineering Department, Bilkent University, Ankara, Turkey, ²National Magnetic Resonance Research Center (UMRAM), Ankara, Turkey, ³Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, United States, ⁴Center for Magnetic Resonance Research (CMRR), University of Minnesota, Minneapolis, MN, United States

Specific absorption rate (SAR) is a significant issue for ultra-high field (UHF, B0≥7T) imaging. In this study, we investigate a strategy based on optimizing the topography of transmit elements in 3D (i.e., adding bumps to a resonant planar structure) in order to reduce the local SAR while keeping B₁⁺ efficiency constant inside a region of interest. For proof of concept, we modified three different resonant structures and compared their performance to previous designs with EM simulations. In addition, we built one of the proposed design and experimentally tested it using a whole-body 10.5T scanner.

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