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Abstract #1885

Comparison of Root-Flip and Quadratic-Phase RF Pulses for Outer Volume Suppression

Hong Shang1, Hai Luo2, Xia Liu2, Gaojie Zhu2, and Leping Zha2

1Bioengineering, UC Berkeley - UCSF, Berkeley/San Francisco, CA, United States, 2AllTech Medical Systems, Chengdu, China, People's Republic of

Two classes of previously proposed nonlinear phase RF pulses, the quadratic-phase pulse and root-flip optimized pulse, are compared in terms of selectivity, peak B1 value, pulse energy, and sensitivity to B1 variations, when applied for spatial outer volume suppression. Root-flip pulses have lower peak B1 and energy given the same transition width and pulse duration, or sharper transition given the same peak B1, while quadratic-phase pulses have less sensitivity to B1 variations that maintains profile shape with B1 deviations, and thus less prone to residual saturation band magnetization. This work provides insights to pulse designers in regards to nonlinear phase pulse design and application.

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