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
Hitachi Medical Corporation, Kashiwa, Chiba,
Research Laboratory, Hitachi Ltd, Kokubunji, Tokyo,
The inhomogeneity of B
and high local SAR are major problems in high field MRI.
To improve the homogeneity of B
, RF shimming
is used. The parameters of RF shimming affect the
homogeneity of B
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
demonstrated by numerical simulation.
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