Abstract #4222
Simultaneous Use of Linear and Nonlinear Gradients as Independent K-Space Variables for RF Excitation
Koray Ertan 1,2 and Ergin Atalar 1,2
1
Department of Electrical and Electronics
Engineering, Bilkent University, Ankara, Turkey,
2
National
Magnetic Resonance Research Center (UMRAM), Ankara,
Turkey
Effect of nonlinear gradients on the RF excitation
profile is formulated by using independent k-space
variables. During pulse design, target excitation
profiles can be calculated in order to eliminate the
effect of B1 inhomogeneity. Use of independent k-space
variable for nonlinear gradients leads to design
technique for optimally combining linear gradients and
nonlinear gradients. Optimizations have been performed
in order to achieve target excitation profile. An
example case demonstrates that simultaneous use of
linear gradients and nonlinear gradients can achieve
more accurate excitation profile in comparison with the
only linear or only nonlinear gradients.
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