Adiabatic refocusing pulse which compensates for variable of power and off‐resonance effects

Abstract
Adiabatic 180° inversion rf pulses can be converted to 180° refocusing pulses by inverting the effective field midway during the pulse. Suitable pulses retain insensitivity to large variations in the rf field strength and act over a reasonable spectral width. Such pulses may find application in studies utilizing surface coils. © 1987 Academic Press, Inc.