Cem Murat Deniz1,2, Leeor Alon1,2,
Riccardo Lattanzi1,2, Daniel K. Sodickson1, Yudong Zhu1
1Center for Biomedical Imaging,
Department of Radiology, NYU School of Medicine, New York, NY, United States;
2Sackler Institute of Graduate Biomedical Sciences, NYU School of
Medicine, New York, NY, United States
SAR
management and excitation homogeneity are critical aspects of RF pulse design
at ultra-high magnetic field strength. We investigated the effects on SAR
behavior of incorporating measurable E-field interactions into parallel
transmission RF pulse design. We simulated three different transmit coil
array configurations using two different coil loadings, a human mesh and a
homogeneous water phantom. Small-tip-angle and linear class large-tip-angle
pulses were employed. We found that global SAR during parallel excitation
decreases when E-field interactions
are included in RF pulse design optimization. Larger global SAR benefits were
achieved for lower accelerations and for human mesh data.
Keywords