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Abstract #0203

Parallel transmit spatial spectral pulse design with specific absorption rate control: demonstration for robust water excitation at 7 Tesla

Xin Shao1, Xiaodong Ma2, Hua Guo1, Kamil Ugurbil3, and Xiaoping Wu3
1Center for Biomedical Imaging Research, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, China, 2Department of Radiology and Imaging Sciences, University of Utah, Salt Lake City, UT, United States, 3Center for Magnetic Resonance Research, Radiology, Medical School, University of Minnesota, Minneapolis, MN, United States

Synopsis

Keywords: Parallel Transmit & Multiband, RF Pulse Design & FieldsThere has been an increasing interest in designing parallel transmit spatial spectral (pTx SPSP) RF pulses for reducing transmit B1 inhomogeneity while achieving water selective excitation. In this study, we propose a new pTx SPSP pulse design method with explicit SAR control with nearly complete fat suppression. Our results based on human calibration data acquired at 7T suggest that our method is equally applicable to both kT-point and SPINS pulse design, outperforming an existing method based on combining pTx with binomial pulse design approach. We believe our method will have a utility for high-resolution, whole-brain functional MRI at ultrahigh field.

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