Abstract #3236

Parallel transmission RF pulse design for simultaneous multi‐slab excitation at 7 Tesla: a simulation study

Xin Shao¹, Xiaodong Ma², Simin Liu¹, Kamil Ugurbil², Hua Guo¹, and Xiaoping Wu²

¹Center for Biomedical Imaging Research, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, China, ²Center for Magnetic Resonance Research, Radiology, Medical School, University of Minnesota - Twin Cities, Minneapolis, MN, United States

Synopsis

It has been reported that combining ultrahigh field (UHF) with 3D imaging is beneficial for high-resolution imaging. Nevertheless, image quality may suffer from increased magnetic field inhomogeneity. Thus, we combined radiofrequency (RF) parallel transmission (pTx) with 3D simultaneous multi-slab (SMSlab) acquisition at 7T to get improved transmit field and optimal SNR efficiency concurrently. By simulation, it was proved that by using a 3-spoke RF pulses we could get 25% more uniform excitation magnitude than 2-spoke pulses (with almost the same RF peak power and identical pulse duration).

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