An Optimized Composite Refocusing Pulse for Ultra-High Field MRI

Abstract

Purpose At high magnetic fields, the wavelengths of the RF pulses transmitted in MRI are comparable to the size of the human torso/head [1], which gives rise to inhomogeneous B1 fields. Variations of the RF field can be reduced (for example) by the use of tailored slice-selective pulses optimized for the desired excitation profile [2] based on spokes or an… (More)

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