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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