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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