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Abstract #1121

Parallel transmit local SAR vs. mesh resolution in EMF simulations of highly detailed anatomical models – a rigorous analysis

Andre Kuehne1, Eva Oberacker2, Helmar Waiczies1, Mostafa Berangi1, Jacek Nadobny3, Pirus Ghadjar3, Peter Wust3, and Thoralf Niendorf1,2,4
1MRI.TOOLS GmbH, Berlin, Germany, 2Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany, 3Clinic for Radiation Oncology, Charité Universitätsmedizin, Berlin, Germany, Berlin, Germany, 4Experimental and Clinical Research Center (ECRC), joint cooperation between the Charité Medical Faculty and the Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany

Electromagnetic simulations are an important tool for RF coil and thermal RF applicator development. For rapid design evaluation, fast low mesh resolution simulations would be of benefit, which can however potentially introduce errors in regions of intricate tissue distributions. We rigorously analyze local power deposition errors introduced by using low-resolution meshes in simulations of a highly detailed head model at 297 MHz. Our results indicate, that even at 5mm the introduced error is acceptable. However, artificial current paths are formed in the oronasal cavity, leading to not critical albeit locally elevated power deposition, thus deserving additional attention.

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