Abstract #1449
RF Pulse Design using Linear and Nonlinear Gradient Fields: A Multi-Dimensional k-Space Approach
Emre Kopanoglu 1 , Leo K. Tam 1 , and Robert Todd Constable 1
1
Dept. Diagnostic Radiology, Yale University
School of Medicine, New Haven, Connecticut, United
States
The effect of using nonlinear gradient fields (NLGFs) on
excitation fidelity is studied, specifically on a
multi-dimensionally selective excitation scheme. For
this purpose, three nonlinear and two linear gradient
fields (LGFs) are used. Two-dimensionally selective RF
pulses are designed utilizing more than two fields
simultaneously, using a multi-dimensional k-space
approach. Using simulations, it is shown that increasing
the number of k-space dimensions beyond the number of
spatial coordinates may yield excitation profiles with
lower error, compared to the target profile. It is also
shown that, NLGFs may improve excitation fidelity, even
for profiles that are more compatible with LGFs.
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