Self‐refocusing 270° gaussian pulses for slice selection without gradient reversal in magnetic resonance imaging

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Abstract
It is demonstrated, on the grounds of simulations, how 270° Gaussian pulses can be used for slice selection in nuclear magnetic resonance imaging experiments. It is shown that the usual gradient reversal procedure can be omitted if the selective 90° pulse normally used is replaced by a self‐refocusing 270° pulse with a Gaussian timedomain amplitude profile, and some of the properties which are specific to this type of pulse are explored. © 1989 Academic Press, Inc.

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