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Abstract #0375

Reduction of worst-case local SAR with constraints on RF shimming parameters based on principal component analysis

Kosuke Ito 1 , Yoshihisa Soutome 1,2 , Yukio Kaneko 2 , and Masahiro Takizawa 1

1 Hitachi Medical Corporation, Kashiwa, Chiba, Japan, 2 Central Research Laboratory, Hitachi Ltd, Kokubunji, Tokyo, Japan

The inhomogeneity of B 1 map and high local SAR are major problems in high field MRI. To improve the homogeneity of B 1 , RF shimming is used. The parameters of RF shimming affect the homogeneity of B 1 and the local SAR. As the number of RF transmission channels increases, the number of possible combinations of RF shimming parameters increases, and peak local SAR may increase. In this study, we applied principal component analysis to determine constraints on RF shimming parameters. Exclusion of high local SAR combinations of RF shimming parameters without degrading the homogeneity of B 1 was demonstrated by numerical simulation.

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