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Abstract #3171

Tx-array design strategies for reducing excitation artifact and local SAR hot spots in pTx MRI

Pei-Shan Wei 1,2 , Mike J. Smith 2 , Christopher P. Bidinosti 3 , and Scott B. King 1,2

1 Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, Canada, 2 National Research Council of Canada, Winnipeg, Manitoba, Canada, 3 Department of Physics, University of Winnipeg, Winnipeg, Manitoba, Canada

Local SAR minimization is of particular importance for Tx-array MRI. We hypothesize that high local hot spots in excitation artifacts are partially due to strong asymmetries in B1+ fields of individual array elements of a Tx-array, which are more prominent at higher B0 fields. We show that modifications to the individual array element geometries, that improve both B1+ symmetry and reduce local B1+ hot spots, resulted in reduced hot spots in excitation artifact, in our case by 25%. Such Tx-array design strategies can improve performance of pTx MRI and may lower local SAR hot spots relative to traditional Tx-array designs.

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