Whereas a spin echo (SE)arises from the action of two RF pulses, a stimulated echo (STE)occurs from the action of three or more RF pulses.

To generate STE, should all RF pulses be 90-deg RF pulses? Or any three alpha-deg RF pulses?

If the sequence diagram were 180-90-180, how many echoes(including Hahn Echo) would be generated?

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