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.
